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Current Applied Polymer Science

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ISSN (Print): 2452-2716
ISSN (Online): 2452-2724

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Research Article

Measured and Calculated Expansion of Polystyrene Beads Comprising Four Blowing Agents in Hot Silicone Bath and in Water Vapor as Well as in Extrusion for Boards

Author(s): Heinrich Horacek*

Volume 5, Issue 1, 2022

Published on: 15 June, 2022

Page: [45 - 59] Pages: 15

DOI: 10.2174/2452271605666220428100658

Price: $65

Abstract

Background: The published models were sophisticated and described the expansion in dependence on time only in the first stage. The object was to explain the discrepancy between foaming under pressure release XPS and foaming by heat supply EPS by model calculations.

Methods: The rate of expansion of small samples comprising blowing agent and polystyrene was measured by buoyancy in a silicone bath at 110 °C and that of extrusion on photographs of the volume increase after the nozzle. A viscosity model and a diffusion model were established, and experimental data were compared with calculated data.

Results: The expansion rate in the silicone bath was about 100 times slower than that in extrusion at the same nozzle temperature. The velocity of foaming in the bath by heat supply was observed to be dominated by viscosity and that of foaming under pressure release in extrusion to be stirred by diffusion. Calculations according to the viscosity model allowed the description of foaming in silicone, and the diffusion model reproduced the data of extrusion.

Conclusion: The common feature of both models was their simplicity. According to the models, the efficiency of blowing agents was only dependent on the molecular weight and on the solubility. The time determining influence on foaming was diffusion in extrusion of XPS and viscosity for expansion of EPS in silicone bath and water vapor.

Keywords: Foam, cell structure, diffusion, viscosity, heat supply, pressure release, model calculation.

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[1]
Patel RD. Bubble growth in a viscous Newtonian liquid. Chem Eng Sci 1980; 35: 2352-6.
[http://dx.doi.org/10.1016/0009-2509(80)87016-3]
[2]
Ammon M, Denson CD. A study of foam the dynamics of growth of closed spaced spherical bubbles. Polym Eng Sci 1984; 24: 1026-34.
[http://dx.doi.org/10.1002/pen.760241306]
[3]
Elshereef R, Vlachopoulos J, Elkamel A. Comparison and analysis of bubble growth and foam formation models. Eng Comput 2010; 27(3): 387-408.
[http://dx.doi.org/10.1108/02644401011029943]
[4]
Han CD, Yoo JJ. Studies on structural foam processing: Bubble growth during filling. Polym Eng Sci 1981; 21(9): 518.
[http://dx.doi.org/10.1002/pen.760210903]
[5]
Ramesh NS, Rasmussen Don H, Campell G. Numerical and experimental studies of bubble growth during the microcellular Foaming Process. Polym Eng Sci 1991; 31(23): 1657-64.
[http://dx.doi.org/10.1002/pen.760312305]
[6]
Tsivintzelis I, Angelopoulou AG. Foaming of polymers with supercritical CO2: An experimental and theoretical study. Pol 2007; 48: 5928-39.
[7]
Leng SN, Park CB, Xu D, Li H, Fenton RG. Computer simulation of bubble growth phenomena in foaming. Ind Eng Chem Res 2006; 45: 7823-31.
[http://dx.doi.org/10.1021/ie060295a]
[8]
Feng JJ, Bertelo CA. Prediction of bubble growth and size distribution in polymer foaming based on new heterogeneous nucleation model. J Rheol (NYNY) 2004; 48: 439-62.
[http://dx.doi.org/10.1122/1.1645518]
[9]
Venerus DC. Diffusion -induced bubble growth in viscous liquids of finite and infinite extent. Polym Eng Sci 2001; 41: 1390-8.
[http://dx.doi.org/10.1002/pen.10839]
[10]
Yan Q, Wang H, Li R, Huang D, Han X. Experimental and numerical simulation of non isothermal bubble growth in polymer foaming. IOP Conf Series Mater Sci Eng 2005; 505.
[11]
Taki Kentaro, Hayashizaki H, Fukada K. A simple bubble nucleation, growth, coalescence model for coke production process. ISIJ International 2014; 54(11): 2493-502.
[12]
Fasihi M, Asgari Targhi A. Investigation of material characteristics and processing conditions effects on bubble growth behavior in a physical foaming process. In: e-Polymer. 2016; pp. 387-94.
[13]
Rao R, Long K, Mony L, Roberts Ch, Soehnel D, Voskuilen T. Bubble growth and foam formation model calculations. The 33rd International Conference of the Polymer Society Cancun Mexico 10-14 Dec 2017
[14]
Arefmanesh A, Advani S. Diffusion -induced growth of a gas bubble in a viscoelastic fluid. Rheol Acta 1991; 30: 274-8.
[http://dx.doi.org/10.1007/BF00366641]
[15]
Hesani M, Sabagh S, Rafizadeh M. Simplifcation of bubble growth modeling during foam formation by using rosner -epstein method. The 8th Int Chem Eng Congr and Exhib CHEC
[16]
Shafi MA, Joshi K, Flumerfelt RW. Bubble size distribution in freely expanded foams. Chem Eng Sci 1997; 52(4): 635-44.
[http://dx.doi.org/10.1016/S0009-2509(96)00433-2]
[17]
Stewart C. Nucleation and growth of bubbles in elastomers. J Pol Sci 1970; 8: 937-55.
[http://dx.doi.org/10.1002/pol.1970.160080609]
[18]
Yang J, Jiang Tuahui, Liu Bujin, et al. Experimental and numerical analysis of bubble nucleation in foaming polymer. Mater Des 2021; 203: 109577.
[http://dx.doi.org/10.1016/j.matdes.2021.109577]
[19]
Goel SK, Beckman EJ. Generation of microcellular polymeric foams using supercritical carbon dioxide I: Effect of pressure and temperature on nucleation. Polym Eng Sci 1994; 34(14): 1147-57.
[http://dx.doi.org/10.1002/pen.760341407]
[20]
Wang J, Zhai W, Ling J, Shen Ben, Zheng Wenige, Park Chul B. Ultrasonic microcellular poly(lactic acid): A novel approach to reduce cell size distribution and increase foam expansion. Ind Eng Chem Res 2011; 50(24): 13840-7.
[http://dx.doi.org/10.1021/ie201643j]
[21]
Salah Al-Enezi. CO2 induced foaming behaviour of polystyrene near glass transition. Internat J of Pol Sci 2017.
[22]
Shaayegan V, Wang G, Park CB. Effect of foam processing parameters on bubble nucleation and growth dynamics in high pressure foam injetion molding. Chem Eng Sci 2016; 155.
[23]
Otsuki Y, Kanai T. Numerical simulation of bubble growth in viscoelastic fluid with diffusion of dissolved foaming agents. Polym Eng Sci 2005; 45: 1277-87.
[http://dx.doi.org/10.1002/pen.20395]
[24]
Aloku GO, Yuan XF. Numerical simulation of polymer foaming process in extrusion flow. Chem Eng Sci 2010; 65: 3749-61.
[http://dx.doi.org/10.1016/j.ces.2010.03.022]
[25]
Yao S, Chen Y, Ling Y, Hu D, Xi Z, Zhao L. Analysis of bubble growth in supercritical CO2 Extrusion Foaming PET Process on dynamic flow simulation. Polymers (Basel) 2021; 12(16): 2799.
[http://dx.doi.org/10.3390/polym13162799] [PMID: 34451336]
[26]
Horacek H. Manufacture and model Calculation of porcelain-like microcellular low density polystyrene. J Cell Plast 2015; (0): 1-26.
[27]
Horacek H. Gleichgewichtsdrücke, Löslichkeit und Mischbarkeit des Systems. PS-KW“ Koll. Zu Z Polymere 1967; 250: 863-74.
[28]
Rubin LC. Some effects of cross linking upon the foaming behavior of heat plastified polystyrene. J Cell Plast 1965; 311-20.
[29]
Horacek H. Zur Schaumgeometrie bei Styropor. Die Angew Makromol Chem 1970; 12: 105-30.
[http://dx.doi.org/10.1002/apmc.1970.050120108]

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