环氧化杜仲胶增韧改性聚乳酸的性能

采用熔融共混法将环氧化杜仲胶(EEUG)用于聚乳酸(PLA)的增韧改性,制备了具有良好韧性的全生物基PLA/EEUG共混物,考察了EEUG用量对共混物的热性能、动态力学性能、力学性能及微观形貌等的影响.结果表明,PLA/EEUG共混物为典型的两相不相容体系.EEUG的加入限制了PLA分子链的运动,导致PLA的结晶度下降...

Properties of epoxidized Eucommia Ulmoides gum toughening polylactic acid

Epoxidized Eucommia Ulmoides gum(EEUG)was used to toughen polylactic acid(PLA)by melt blending,and all bio-based PLA/EEUG blends with good toughness were prepared,the effects of EEUG amount on thermal properties,dynamic mechanical properties,mechanical properties and micro morphology of the blends were investigated.The results showed that PLA/EEUG blend was a typical two-phase incompatible system.The addition of EEUG restricted the movement of PLA molecular chain,resulting in decrease of PLA crystallinity,but promoted the improvement of its cold crystallization ability,which played the role of nucleating agent.When the amount of EEUG was 15 phr(mass),the elongation at break increased from 12%of pure PLA to 290%,and the notched impact strength increased from 4.1 kJ/m^2 to 8.0 kJ/m^2.When the blends were subjected to tension and impact,the matrix had obvious plastic deformation and absorbed conside-rable energy during fracture process,thus impro-ving the toughness of the blend.