Self-Healing Polymers and Composites: Extrinsic Routes

Nidhi      Agrawal; Bharti      Arora
Abstract

Polymers have the property to convert the physical stress to covalent bond shuffling, thereby acting as the healing agents. Polymeric coatings, paints, electronic devices, drug delivery, and many other applications find self-healing materials as a smart technique to prolong the life cycle of the end products. The idea behind these artificial materials is to make them behave like the human body. It should sense the failure and repair it before it becomes worse or irreparable. Researchers have explored several polymeric materials which can self-heal through intrinsic or extrinsic mechanisms. This review specifically focuses on extrinsic routes governed by mechanical stress, temperature change in a covalent bond, humidity, variation in pH, optical sensitivity, and electrochemical effects. Each possible mechanism is further supported by the molecules or bonds which can undergo the transformations under given conditions. On a broader scale, bonds that can self-repair by mechanical force, thermal treatment, chemical modifications, UV irradiation, or electromagnetic phenomenon are covered under this review. It brings into the notice the shortcomings or challenges in adopting the technology to the commercial scale. The possible molecules or bonds which can undergo self-healing under certain conditions have been distinctly presented in a well-segregated manner. This review is envisaged to act as a guide for researchers working in this area.
Keywords: Self-healing, extrinsic routes, polymer composites, stress mechanical, thermal, chemical, optical, electrochemical.
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DOI https://dx.doi.org/10.2174/1570193X18666210802110810	Print ISSN 1570-193X
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