High performance branched poly(lactide) induced by reactive extrusion with low-content cyclic organic peroxide and multifunctional acrylate coagents
作者： Peng Li , Xiaoyi Zhu , Miqiu Kong , Yadong Lv , Qi Yang
DOI: 10.1016/J.POLYMER.2020.122867
关键词: Expansion ratio 、 Organic peroxide 、 Chemistry 、 Branching (polymer chemistry) 、 Steric effects 、 Vicat softening point 、 Reactive extrusion 、 Crystallization 、 Acrylate 、 Chemical engineering
摘要: Abstract In this work, acrylates with various functionalities are employed as the branching coagent for improving properties of long chain branched polylactide (LCB-PLA) induced by reactive extrusion low content cyclic organic peroxide (COP). It is discovered that heat resistance and foaming performance COP-initiated LCB-PLA remarkably improved coagent. Specifically, Vicat softening temperature expansion ratio 0.3 wt% sharply increased to above 150 °C 27.0-fold, respectively (60 °C 9.8-fold COP modified PLA). This due simultaneously enhanced melt strength crystallization obviously degree Moreover, branch-promotion efficiency coagents found be independent functionality steric hindrance. The possible mechanisms on formation topological structures PLA proposed.
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