A review on mechanical and water absorption properties of polyvinyl alcohol based composites/films
What is it about?
Polyvinyl alcohol is a nontoxic and thermoplastic polymer which is completely biodegradable. PVA shows excellent mechanical and thermal properties due to better interfacial adhesion with reinforcing material such as fibers, particles or flakes because of which it can be used for fabrication of composite. PVA based fiber or particle reinforcing composites have gain interest in many applications in different fields. This paper reviews the mechanical and water absorption properties studied by different researcher and some of them were discussed here. The article also focused on the effect on the mechanical properties on PVA based composites with particle or fiber used as reinforcing material at nano/micro level and different polymers used to prepare PVA blend films. The major disadvantage of PVA based composites/films is higher water uptake or solubility in water. To over this negative aspect, many researchers studied crosslinking of PVA based composites/films, which are also discussed in the article. This review concludes that PVA has the potential for use in the synthesis of composites/films with their abundant applications.
Why is it important?
Ecological concerns such as recyclability and environmental safety has resulted in renewed attention in the natural polymer resin. As compared with petroleum based thermoset plastics which are toxic and non-biodegradable. Biodegradable polymers decomposed by the action of microorganisms converted into the form of H2O and CO2. These H2O and CO2 are absorbed into the plant systems. Other environmental benefits of bio-based polymers include low embodied energy, CO2 sequestration, reduced depletion of fossil-based resources and an optimistic impact on agriculture. Due to increase in the awareness of environmentally sustainable technology demand of bio-composite or green composite material have received significant interest in past few year.
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