PLA를 포함한 폴리우레탄 아크릴레이트 및 PEC 블록 공중합체의 합성 및 물성

Abstract

Although high-volume consumable plastics continue to be dominated by non-degradable petroleum-based materials, natural polymers, biopolymers, and synthetic polymers based on renewable resources are the basis for the 21th portfolio of sustainable and eco-friendly plastics. Three factors have recently made biodegradable polymers economically attractive: (i) rising costs of petroleum production resulting from the depletion of the most easily accessible reserves, (ii) environmental and economic concerns associated with waste plastics, and (iii) emissions of carbon dioxide from preparation of petroleum-based materials. These pressures have driven commercial applications based on biodegradable polymers which are related to reduction of carbon dioxide in processing, such poly(ethylene carbonate) (PEC) and poly(lactide) (PLA). To develop environment-friendly polymeric materials, block copolymers, PLA-PEC-PLAs were synthesized by the ring-opening polymerization of lactide in the presence of PEC diol using stannous octoate. Their enzymatic degradation showed that the degradation rate of L-PLA-PEC-PLA was faster than that of L-PLA due to the decreased crystallization, increased hydrophilicity, and fast degradation of PEC. On the other hand, UV-curable polyurethane acrylates with different compositions of PLA and poly(ethylene glycol) as diols were synthesized and UV-curing reaction of their end-capped acrylates was performed. Tensile strength, elongation, and Tg of the UV-cured polyurethane acrylates increased with PLA content in the diol. These results indicated a property of UV-cured polyurethane acrylates could be controlled by environment-friendly diols.