PLA/chain-extended PEG blends with improved ductility
作者： Byung-Sik Park , Jun Cheol Song , Duk Hoon Park , Keun-Byoung Yoon
DOI: 10.1002/APP.34823
关键词:
摘要: Melt blending of polylactic acid (PLA) and a chain-extended polyethylene glycol (CE-PEG) have been performed in an effort to toughen the PLA without significant loss modulus ultimate tensile strength. The PEG was prepared with melt condensation low molecular weight 4,4′-methylenebis(phenylisocyanate) (MDI) for enhancement PEG. thermal mechanical properties, miscibility phase morphologies blends were investigated. By using fracture surface analysis, found be partially miscible system shifted glass transition temperatures. addition CE-PEG leads slight decrease strength modulus, while elongation at break is characterized by important increase (540%), compared neat PLA/PEG (low PEG, Mn = 35,000). relative ductility PLA/CE-PEG 40 times higher than that PLA. brittle transformed into ductile CE-PEG. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
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