【作者】 周持兴； 俞炜； 娄立娟； 尤金秀；

【Author】 Chixing Zhou,Wei Yu,Lijuan Lou,Jinxiu You (Polymer Science & Engineering Department,Shanghai Jiao Tong University,Shanghai 200240)

【机构】 上海交通大学高分子科学与工程系； 上海交通大学流变学研究所；

【摘要】 <正>工业级聚乳酸(DL-PLA)是种可生物降解材料,但存在熔体强度低、结晶速度慢、力学与耐热性能不能满足应用需要等缺点,因此当前的研究工作聚焦在进一步提高其性价比上。除了基于单体共聚制备改性聚乳酸方法外,通过反应加工是个可行且灵活性强的途径。通常,聚酯类聚合物熔体反应可通过基团反应和自由基反应两种方法,它们扩链产物往往具有更多还原

【Abstract】 To obtain the long chain branch Polylactic acid,we studied the melt reaction process through multiple reactive group reaction and free radical reaction respectively.The result shows that multiple reactive group reaction is relatively better to design and control the polymeric topological structure. To characterize the polymeric topological structure the rheological experiments combined with Branch-on-branch(BOB) model were used.The results show the approach is feasible.The crystallization property is improved by melt reactions,which indicates that the reactive group of the coupling agents and nucleating particles are critical for improving crystallization property.更多还原