Abstract
Background: Today, polyurethane foams can be found in various commercial products such as bedding, home furniture, automotive interiors and even construction materials. From a chemical point of view, polyurethane foams are made from a chemical reaction between a polyol (molecules with more than one hydroxyl group) and a diisocyanate in the presence of a blowing agent.
Objective: Because of their highly stable bonds, polyurethane foams are considered as nondegradable leading to some environmental impact. To address this concern different bio-based fillers have been used to create “greener” polyurethane materials. This review presents an overview of different bio-based fillers and containing natural polyols for polyurethane foams formulation with respect to their natural properties, sizes, geometries and contents.
Method: A wide range of bio-based fillers derived from wood and non-wood sources are summarized based on their physico-mechanical properties. Then, possible applications are presented and future trends are discussed for the research and development of these complex (multiphase systems) materials (polymer composite foams).
Conclusion: Beside traditional polyurethane foams applications including automotive, building, home furniture and package, bio-based filler addition could bring new feature and widen their applications such as shape memory and medication, as well as oil absorbent.
Keywords: Bio-based fillers, biofillers, flexible foam, mechanical properties, polyurethane, rigid foam.
Graphical Abstract
[1]
Neilsen MK, Krieg RD, Schreyer HL. A constitutive theory for rigid polyurethane foam. Polym Eng Sci 1995; 35: 387-94.
[2]
Chiu HT, Chang CY, Pan HW, Chiang TY, Kuo MT, Wang YH. Characterization of polyurethane foam as heat seal coating in medical pouch packaging application. J Polym Res 2012; 19: 1-12.
[3]
Landrock AH. Handbook of plastic foams: Types, properties, manufacture and applications. Netherlands: Elsevier 1995; pp. 1-10.
[4]
Rossio RC, Vecchio M, Abramczyk J. Polyurethane energy absorbing foams for automotive applications. Proceedings of the International Congress and exposition. 1993; March 1-5; Detroit. MI. 1993.
[5]
Gu R, Konar S, Sain M. Preparation and characterization of sustainable polyurethane foams from soybean oils. J Am Oil Chem Soc 2012; 89: 2103-11.
[6]
Thomas D, Mantell SC, Davidson JH, Goldberg LF, Carmody J. Analysis of sandwich panels for an energy efficient and self-supporting residential roof. J Sol Energy Eng 2006; 128: 338-48.
[7]
Hakim AA, Nassar M, Emam A, Sultan M. Preparation and characterization of rigid polyurethane foam prepared from sugar-cane bagasse polyol. Mater Chem Phys 2011; 129: 301-7.
[8]
Kim SH, Park HC, Jeong HM, Kim BK. Glass fiber reinforced rigid polyurethane foams. J Mater Sci 2010; 45(10): 2675-80.
[9]
Joshi SV, Drzal LT, Mohanty AK, Arora S. Are natural fiber composites environmentally superior to glass fiber reinforced composites? Compos, Part A Appl Sci Manuf 2004; 35(3): 371-6.
[12]
Thomas S, Shanks R, Chandran S. Design and applications of nanostructured polymer blends and nanocomposite systems. US: Elsevier 2015; pp. 1-13.
[13]
Daniel IM, Fenner JS, Werner BT, Cho JM. Characterization and modeling of polymeric foam under multi-axial static and dynamic loading. Proceedings of the Society for Experimental Mechanics Series 2017; 4: 123-34.
[14]
Tao Y, Li P, Cai L. Effect of fiber content on sound absorption, thermal conductivity, and compression strength of straw fiber-filled rigid polyurethane foams. BioResources 2016; 11: 4159-67.
[16]
Sangeetha NJ, Retna AM, Joy YJ, Sophia A. A review on advanced methods of polyurethane synthesis based on natural resources. J Chem Pharm Sci 2014; 7: 242-9.
[17]
Leng W, Li J, Cai Z. Synthesis and characterization of cellulose nanofibril-reinforced polyurethane foam. Polymers 2017; 9: 597.
[20]
Cateto CA, Barreiro MF, Rodrigues AE, Belgacem MN. Optimization study of lignin oxypropylation in view of the preparation of polyurethane rigid foams. Ind Eng Chem Res 2009; 48(5): 2583-9.
[21]
Xu Z, Tang X, Gu A, Fang Z. Novel preparation and mechanical properties of rigid polyurethane foam/organoclay nanocomposites. J Appl Polym Sci 2007; 106: 439-47.
[22]
Leng W, Li J, Cai Z. Synthesis and characterization of cellulose nanofibril-reinforced polyurethane foam. Polymers 2017; 9: 1-14.
[23]
Guo A, Javni I, Petrovic Z. Rigid polyurethane foams based on soybean oil. J Appl Polym Sci 2000; 77: 467-73.
[24]
Septevani AA, Evans DA, Martin DJ, Annamalai PK. Hybrid polyether-palm oil polyester polyol based rigid polyurethane foam reinforced with cellulose nanocrystal. Ind Crops Prod 2018; 112: 378-88.
[25]
Yao Y, Yoshioka M, Shiraishi N. Water-absorbing polyurethane foams from liquefied starch. J Appl Polym Sci 1996; 60: 1939-49.
[26]
Hakim AA, Nassar M, Emam A, Sultan M. Preparation and characterization of rigid polyurethane foam prepared from sugar-cane bagasse polyol. Mater Chem Phys 2011; 129: 301-7.
[27]
Seydibeyoğlu MÖ, Misra M, Mohanty A, et al. Green polyurethane nanocomposites from soy polyol and bacterial cellulose. J Mater Sci 2013; 48: 2167-75.
[28]
D’Souza J, Camargo R, Yan N. Polyurethane foams made from liquefied bark-based polyols. J Appl Polym Sci 2014; 131: 1-10.
[29]
Kirpluks M, Cābulis U, Kurańska M, Prociak A. Three different approaches for polyol synthesis from rapeseed oil. Key Eng Mater 2013; 559: 69-74.
[30]
Kirpluks M, Cabulis U, Avots A. Flammability of bio-based rigid polyurethane foam as sustainable thermal insulation material.In: Almusaed A, Almssad A, Eds Insulation materials in context of sustainability. InTech 2016; pp. 83-111.
[31]
Kumari S, Chauhan GS, Ahn JH. Novel cellulose nanowhiskers-based polyurethane foam for rapid and persistent removal of methylene blue from its aqueous solutions. Chem Eng J 2016; 304: 728-36.
[32]
Zhou X, Sain MM, Oksman K. Semi-rigid biopolyurethane foams based on palm-oil polyol and reinforced with cellulose nanocrystals. Compos, Part A Appl Sci Manuf 2016; 83: 56-62.
[33]
Septevani AA, Annamalai PK, Martin DJ. Synthesis and characterization of cellulose nanocrystals as reinforcing agent in solely palm based polyurethane foam. Proceedings of the 3rd international symposium on applied chemistry 2017.
[36]
Teshnizi SH, Koloor SS, Sharifishourabi G, Ayob AB, Yazid YM. Mechanical behavior of GFRP laminated composite pipe subjected to uniform radial patch load. Adv Mat Res 2012; 488: 542-6.
[37]
Yousefian H, Rodrigue D. Morphological, physical and mechanical properties of nanocrystalline cellulose filled Nylon 6 foams. J Cell Plast 2017; 53: 253-71.
[38]
Chimeni DY, Dubois C, Rodrigue D. Polymerization compounding of hemp fibers to improve the mechanical properties of linear medium density polyethylene composites. Polym Compos 2018 Available from: 24279 https://onlinelibrary.wiley.com/doi/pdf/10.1002/pc
[39]
Pandey JK, Nagarajan V, Mohanty AK, Misra M. Commercial potential and competitiveness of natural fiber composites.In: Misra M, Pandey JK, Mohanty AK, Eds.Biocomposites. US: Elsevier 2015; pp. 1-15.
[40]
Väisänen T, Das O, Tomppo L. A review on new bio-based constituents for natural fiber-polymer composites. J Clean Prod 2017; 149: 582-96.
[41]
Mohanty AK, Misra M, Drzal LT. Natural fibers, biopolymers, and biocomposites. US: CRC press 2005.
[42]
Stevens C. Industrial applications of natural fibres: Structure, properties and technical applications. US: John Wiley & Sons 2010.
[43]
Zhou X, Sethi J, Geng S, et al. Dispersion and reinforcing effect of carrot nanofibers on biopolyurethane foams. Mater Des 2016; 110: 526-31.
[44]
Prociak A, Kurańska M, Malewska E, et al. Biobased polyurethane foams modified with natural fillers. Polimery 2015; 60: 592-9.
[45]
Kuranska M, Prociak A. Porous polyurethane composites with natural fibres. Compos Sci Technol 2012; 72: 299-304.
[46]
Habibi Y, Lucia LA, Rojas OJ. Cellulose nanocrystals: Chemistry, self-assembly, and applications. Chem Rev 2010; 110: 3479-500.
[47]
Zanini M, Lavoratti A, Lazzari LK, et al. Producing aerogels from silanized cellulose nanofiber suspension. Cellulose 2017; 24: 769-79.
[49]
Mukhopadhyay S, Fangueiro R, Arpaç Y, Şentürk Ü. Banana fibers-variability and fracture behaviour. J Eng Fibers Fabrics 2008; 3: 39-45.
[50]
Kim JM, Kim JH, Ahn JH, et al. Synthesis of nanoparticle-enhanced polyurethane foams and evaluation of mechanical characteristics. Compos B Eng 2018; 136: 28-38.
[51]
Nechyporchuk O, Belgacem MN, Bras J. Production of cellulose nanofibrils: A review of recent advances. Ind Crops Prod 2016; 93: 2-5.
[52]
Li Y, Ragauskas AJ. Ethanol organosolv lignin-based rigid polyurethane foam reinforced with cellulose nanowhiskers. RSC Adv 2012; 2: 3347-51.
[53]
Demiroğlu S, Erdoğan F, Akın E, Ayvalık A, Karavana HA, Seydibeyoglu MO. Natural fiber reinforced polyurethane rigid foam. Gazi Uni J Sci 2017; 30(2): 97-109.
[54]
Sharifishourabi G, Alebrahim R, Sharifi S, Ayob A, Vrcelj Z, Yahya MY. Mechanical properties of potentially-smart carbon/epoxy composites with asymmetrically embedded shape memory wires. Mater Des 2014; 59: 486-93.
[55]
Farhatnia F, Sharifi GA, Rasouli S. Numerical and analytical approach of thermo-mechanical stresses in FGM beams. Proceedings of the World Congress on Engineering 2009
[56]
Sharifishourabi G, Alebrahim R, Teshnizi SS, Ani FN. Effects of material gradation on thermo-mechanical stresses in functionally graded beams. APCBEE Procedia 2012; 3: 194-9.
[57]
Salazar VL, Caraschi JC, Leão AL. Evaluation of emission products from pyrolysis of car seats made of coir fiber and of polyurethane foam. Eng Sanit Ambient 2005; 10: 162-6.
[58]
Ekici B, Kentli A, Küçük H. Improving sound absorption property of polyurethane foams by adding tea-leaf fibers. Arch Acoust 2012; 37: 515-20.
[59]
Gu R, Sain MM. Effects of wood fiber and microclay on the performance of soy based polyurethane foams. J Polym Environ 2013; 21: 30-8.
[60]
Oh ST, Kim SH, Jeong HY, Lee JM, Cho JW, Park JS. The mechanical properties of polyurethane foam wound dressing hybridized with alginate hydrogel and jute fiber. Fibers Polym 2013; 14: 173-81.
[61]
Ruijun GU, Khazabi M, Sain M. Fiber reinforced soy-based polyurethane spray foam insulation. Part 2: Thermal and mechanical properties. BioResources 2011; 6: 3775-90.
[62]
Gu R, Sain MM, Konar SK. A feasibility study of polyurethane composite foam with added hardwood pulp. Ind Crops Prod 2013; 42: 273-9.
[63]
Ahsan Q, Ching CP, Yaakob B, Yuhazri M. Physical and sound absorption properties of spent tea leaf fiber filled polyurethane foam composite. Appl Mech Mater 2014; 660: 541-6.
[64]
Li S, Li C, Yan M, Wu Y, Cao J, He S. Fabrication of nano-crystalline cellulose with phosphoric acid and its full application in a modified polyurethane foam. Polym Degrad Stabil 2013; 98: 1940-4.
[65]
Wang FL, Mei QL, Huang ZX, Qin Y, Du M. Research of processing and properties of rigid polyurethane foam reinforced with jute fiber. J Wuhan Univ Tech-Mater Sci Ed 2006; 28: 27-9.
[66]
El-Meligy MG, Mohamed SH, Mahani RM. Study mechanical, swelling and dielectric properties of prehydrolysed banana fiber-waste polyurethane foam composites. Carbohydr Polym 2010; 80: 366-72.
[67]
Azmi MA. Rigid polyurethane foam reinforced coconut coir fiber properties. Int J Integrated Eng 2012; 4: 11-5.
[68]
Li P, Tao Y, Shi SQ. Effect of fiber content and temperature on the dielectric properties of kenaf fiber-filled rigid polyurethane foam. BioResources 2104(9): 2681-8.
[69]
Soberi M, Suhaili N, Rahman R, Zainuddin F. Effect of kenaf fiber on morphology and mechanical properties of rigid polyurethane foam composite. Mater Sci Forum 2017; 888: 188-92.
[70]
Silva MC, Takahashi JA, Chaussy D, Belgacem MN, Silva GG. Composites of rigid polyurethane foam and cellulose fiber residue. J Appl Polym Sci 2010; 117: 3665-72.
[71]
Li Y, Ren H, Ragauskas AJ. Rigid polyurethane foam reinforced with cellulose whiskers: Synthesis and characterization. Nano-Micro Lett 2010; 2: 89-94.
[72]
Mosiewicki MA, Rojek P, Michałowski S, Aranguren MI, Prociak A. Rapeseed oil-based polyurethane foams modified with glycerol and cellulose micro/nanocrystals. J Appl Polym Sci 2015; 132: 41602.
[73]
Xue BL, Wen JL, Sun RC. Lignin-based rigid polyurethane foam reinforced with pulp fiber: Synthesis and characterization. ACS Sustain Chem& Eng 2014; 2: 1474-80.
[74]
Chang LC, Sain M, Kortschot M. Effect of mixing conditions on the morphology and performance of fiber-reinforced polyurethane foam. J Cell Plast 2015; 51: 103-19.
[75]
Teshnizi SS, Sharifishourabi G, Yazid YM, Ayob AB. Mechanical behavior of composite plate under combined impact and internal pressure. Appl Mech Mater 2012; 229: 732-6.
[76]
Sharifishourabi G, Ayob A, Gohari S, Yahya M, Sharifi S, Vrcelj Z. Flexural behavior of functionally graded slender beams with complex cross-section. J Mech Mater Struct 2015; 12: 1-6.
[77]
Sharifishourabi G, Sharifi S, Ayob A, Yahya MY. Tensile test machine for unsymmetrical materials. Exp Mech 2014; 54: 689-94.
[78]
Huang X, Cornelis F, Xie J, Wu Q, Boldor D, Qi J. High bio-content polyurethane (PU) foam made from bio-polyol and cellulose nanocrystals (CNCs) via microwave liquefaction. Mater Des 2018; 138: 11-20.
[79]
Javni I, Zhang W, Karajkov V, Petrovic ZS, Divjakovic V. Effect of nano-and micro-silica fillers on polyurethane foam properties. J Cell Plast 2002; 38(3): 229-39.
[80]
Benli S, Yilmazer Ü, Pekel F, Özkar S. Effect of fillers on thermal and mechanical properties of polyurethane elastomer. J Appl Polym Sci 1998; 68(7): 1057-65.
[81]
Banik I, Sain MM. Water‐blown soy polyol based polyurethane foams modified by cellulosic materials obtained from different sources. J Appl Polym Sci 2009; 112(4): 1974-87.
[82]
Saint-Michel F, Chazeau L, Cavaille JY. Mechanical properties of high density polyurethane foams: II Effect of the filler size. Compos Sci Technol 2006; 66(15): 2709-18.
[83]
Kausar A. Fabrication of short glass fiber reinforced phenol-formaldehyde-lignin and polyurethane-based composite foam: Mechanical, friability, and shape memory studies. J Polym Eng 2018; 38(1): 33-40.
[84]
Wang C, Wu Y, Li Y, et al. Flame‐retardant rigid polyurethane foam with a phosphorus‐nitrogen single intumescent flame retardant. Polym Adv Technol 2018; 29(1): 668-76.
[85]
Introduction to polyurethanes: Polyurethane Applications, Available
from:
https://polyurethane.americanchemistry.com/Applications/ [Cited: 30th December, 2017].
[86]
Li Y, Shen B, Yi D, et al. The influence of gradient and sandwich configurations on the electromagnetic interference shielding performance of multilayered thermoplastic polyurethane/graphene composite foams. Compos Sci Technol 2017; 138: 209-16.
[87]
Gavgani JN, Adelnia H, Zaarei D, Gudarzi MM. Lightweight flexible polyurethane/reduced ultralarge graphene oxide composite foams for electromagnetic interference shielding. RSC Advances 2016; 6: 27517-27.
[88]
Bernal MM, Martin-Gallego M, Molenberg I, Huynen I, Manchado MA, Verdejo R. Influence of carbon nanoparticles on the polymerization and EMI shielding properties of PU nanocomposite foams. RSC Advances 2014; 4: 7911-8.
[89]
Shen B, Li Y, Zhai W, Zheng W. Compressible graphene-coated polymer foams with ultralow density for adjustable Electromagnetic Interference (EMI) shielding. ACS Appl Mater Interfaces 2016; 8: 8050-7.
[90]
Lee SE, Kang JH, Kim CG. Fabrication and design of multi-layered radar absorbing structures of MWNT-filled glass/epoxy plain-weave composites. Compos Struct 2006; 76: 397-405.
[91]
Shafieizadegan‐Esfahani AR, Katbab AA, Pakdaman AR, Dehkhoda P, Shams MH, Ghorbani A. Electrically conductive foamed polyurethane/silicone rubber/graphite nanocomposites as radio frequency wave absorbing material: The role of foam structure. Polym Compos 2012; 33: 397-403.
[92]
Esfahani AS, Katbab AA, Dehkhoda P, et al. Preparation and characterization of foamed polyurethane/silicone rubber/graphite nanocomposite as radio frequency wave absorbing material: The role of interfacial compatibilization. Compos Sci Technol 2012; 72: 382-9.
[93]
Hunjra MA, Fakhar MA, Naveed K, Subhani T. Polyurethane foam-based radar absorbing sandwich structures to evade detection. J Sandw Struct Mater 2016; 17: 647-58.
[94]
Zhou S, Hao G, Zhou X, et al. One-pot synthesis of robust superhydrophobic, functionalized graphene/polyurethane sponge for effective continuous oil-water separation. Chem Eng J 2016; 302: 155-62.
[95]
Adebajo MO, Frost RL, Kloprogge JT, Carmody O, Kokot S. Porous materials for oil spill cleanup: A review of synthesis and absorbing properties. J Porous Mater 2003; 10: 159-70.
[96]
Shimizu T, Koshiro S, Yamada Y, Tada K. Effect of cell structure on oil absorption of highly oil absorptive polyurethane foam for on‐site use. J Appl Polym Sci 1997; 65: 179-86.
[97]
Li H, Liu L, Yang F. Hydrophobic modification of polyurethane foam for oil spill cleanup. Mar Pollut Bull 2012; 64: 1648-53.
[98]
Wang Z, Ma H, Chu B, Hsiao BS. Super-hydrophobic polyurethane sponges for oil absorption. Sep Sci Technol 2017; 52: 221-7.
[99]
Zhou X, Zhang Z, Xu X, Men X, Zhu X. Facile fabrication of superhydrophobic sponge with selective absorption and collection of oil from water. Ind Eng Chem Res 2013; 52: 9411-6.
[100]
Shi H, Shi D, Yin L, et al. Ultrasonication assisted preparation of carbonaceous nanoparticles modified polyurethane foam with good conductivity and high oil absorption properties. Nanoscale 2014; 6: 13748-53.
[101]
Singh H, Jain AK. Ignition, combustion, toxicity, and fire retardancy of polyurethane foams: A comprehensive review. J Appl Polym Sci 2009; 111: 1115-43.
[102]
Ravey M, Keidar I, Weil ED, Pearce EM. Flexible polyurethane foam. II. Fire retardation by tris(1,3‐dichloro‐2‐propyl) phosphate part A. Examination of the vapor phase (the flame). J Appl Polym Sci 1998; 68: 217-29.
[103]
Stapleton HM, Klosterhaus S, Keller A, et al. Identification of flame retardants in polyurethane foam collected from baby products. Environ Sci Technol 2011; 45: 5323-31.
[104]
Chen MJ, Shao ZB, Wang XL, Chen L, Wang YZ. Halogen-free flame-retardant flexible polyurethane foam with a novel nitrogen-phosphorus flame retardant. Ind Eng Chem Res 2012; 51: 9769-76.
[105]
Zheng Z, Yan J, Sun H, et al. Preparation and characterization of microencapsulated ammonium polyphosphate and its synergistic flame‐retarded polyurethane rigid foams with expandable graphite. Polym Int 2014; 63: 84-92.
[106]
Wolska A, Goździkiewicz M, Ryszkowska J. Thermal and mechanical behaviour of flexible polyurethane foams modified with graphite and phosphorous fillers. J Mater Sci 2012; 47: 5627-34.
[107]
Qian L, Feng F, Tang S. Bi-phase flame-retardant effect of hexa-phenoxy-cyclotriphosphazene on rigid polyurethane foams containing expandable graphite. Polymer 2014; 55: 95-101.
[108]
Xi W, Qian L, Chen Y, Wang J, Liu X. Addition flame-retardant behaviors of expandable graphite and [bis(2-hydroxyethyl) amino]-methyl-phosphonic acid dimethyl ester in rigid polyurethane foams. Polym Degrad Stabil 2015; 122: 36-43.
[109]
Xi W, Qian L, Huang Z, Cao Y, Li L. Continuous flame-retardant actions of two phosphate esters with expandable graphite in rigid polyurethane foams. Polym Degrad Stabil 2016; 130: 97-102.
[110]
Yang R, Hu W, Xu L, Song Y, Li J. Synthesis, mechanical properties and fire behaviors of rigid polyurethane foam with a reactive flame retardant containing phosphazene and phosphate. Polym Degrad Stabil 2015; 122: 102-9.
[111]
Zammarano M, Krämer RH, Harris R, et al. Flammability reduction of flexible polyurethane foams via carbon nanofiber network formation. Polym Adv Technol 2008; 19: 588-95.
[112]
Zhang X, Shen Q, Zhang X, Pan H, Lu Y. Graphene oxide-filled multilayer coating to improve flame-retardant and smoke suppression properties of flexible polyurethane foam. J Mater Sci 2016; 51: 10361-74.
[113]
Liu Y, Du H, Liu L, Leng J. Shape memory polymers and their composites in aerospace applications: A review. Smart Mater Struct 2014; 23: 023001.
[114]
Díaz Lantada A. Systematic development strategy for smart devices based on shape-memory polymers. Polymers 2017; 9: 496.
[115]
Tobushi H, Matsui R, Hayashi S, Shimada D. The influence of shape-holding conditions on shape recovery of polyurethane-shape memory polymer foams. Smart Mater Struct 2004; 13: 881-7.
[116]
Singhal P, Rodriguez JN, Small W, et al. Ultra low density and highly crosslinked biocompatible shape memory polyurethane foams. J Polym SciPart, B, Polym Phys 2012; 50: 724-37.
[117]
Lee SH, Jang MK, Kim SH, Kim BK. Shape memory effects of molded flexible polyurethane foam. Smart Mater Struct 2007; 16: 2486-91.
[118]
Yu YJ, Hearon K, Wilson TS, Maitland DJ. The effect of moisture absorption on the physical properties of polyurethane shape memory polymer foams. Smart Mater Struct 2011; 20: 085010.
[119]
Tey SJ, Huang WM, Sokolowski WM. Influence of long-term storage in cold hibernation on strain recovery and recovery stress of polyurethane shape memory polymer foam. Smart Mater Struct 2001; 10: 321-5.
[120]
Kausar A. Polyurethane composite foams in high-performance applications: A review. Polym Plast Technol Eng 2018; 57: 346-69.
[121]
Mielewski DF, Flanigan CM, Perry C, Zaluzec MJ, Killgoar PC. Soybean oil auto applications: Developing flexible polyurethane foam formulations containing functionalized soybean oil for automotive applications. Indus Biotechnol 2005; 1: 32-4.
[122]
Dahlke B, Larbig H, Scherzer HD, Poltrock R. Natural fiber reinforced foams based on renewable resources for automotive interior applications. J Cell Plast 1998; 34: 361-79.
[123]
Sung G, Kim JW, Kim JH. Fabrication of polyurethane composite foams with magnesium hydroxide filler for improved sound absorption. J Ind Eng Chem 2016; 44: 99-104.
[124]
Schwartz G, Tee BC, Mei J, et al. Flexible polymer transistors with high pressure sensitivity for application in electronic skin and health monitoring. Nat Commun 2013; 4: 1859.
[125]
Vandeparre H, Watson D, Lacour SP. Extremely robust and conformable capacitive pressure sensors based on flexible polyurethane foams and stretchable metallization. Appl Phys Lett 2013; 103: 204103.
[126]
Liu H, Dong M, Huang W, et al. Lightweight conductive graphene/thermoplastic polyurethane foams with ultrahigh compressibility for piezoresistive sensing. J Mater Chem C 2017; 5: 73-83.
[127]
Rodriguez JN, Clubb FJ, Wilson TS, et al. In vivo response to an implanted shape memory polyurethane foam in a porcine aneurysm model. J Biomed Mater Res Part A 2014; 102: 1231-42.
[128]
Singhal P, Small W, Cosgriff-Hernandez E, Maitland DJ, Wilson TS. Low density biodegradable shape memory polyurethane foams for embolic biomedical applications. Acta Biomater 2014; 10: 67-76.
[129]
Nakhoda HM, Dahman Y. Novel biodegradable polyurethanes reinforced with green nanofibers for applications in tissue engineering. Synthesis and characterization. Can J Chem Eng 2014; 92: 1895-902.
[130]
Kaur A, Chattopadhyay S, Jain S, Tyagi A, Singh H. Preparation of hydrogel impregnated antimicrobial polyurethane foam for absorption of radionuclide contaminated blood and biological fluids. J Appl Polym Sci 2016; 133: 43625.
[131]
Guelcher SA, Patel V, Gallagher KM, et al. Synthesis and in vitro biocompatibility of injectable polyurethane foam scaffolds. Tissue Eng 2006; 12: 1247-59.
[132]
Gorna K, Gogolewski S. Preparation, degradation, and calcification of biodegradable polyurethane foams for bone graft substitutes. J Biomed Mater ResPart A 2003; 67: 813-27.
[133]
Gorna K, Gogolewski S. Biodegradable porous polyurethane scaffolds for tissue repair and regeneration. J Biomed Mater ResPart A 2006; 79: 128-38.
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