成核剂ST-NAB3改性扩链聚乳酸的微观结构与性能研究  

Study on microstructure and properties of ST⁃NAB3 nucleating agent⁃modified chain⁃extended polylactic acid

作　　者：丁馨怡 顿东星 秦骏熙 陈钰蕾 韩羽菲 张玉霞[1,2] 周洪福 DING Xinyi;DUN Dongxing;QIN Junxi;CHEN Yulei;HAN Yufei;ZHANG Yuxia;ZHOU Hongfu(College of Light Industry Science and Engineering,Beijing Technology and Business University,Beijing100048,China;Key Laboratory of Processing and Application of Polymeric Foams of China National Light Industry Council,Beijing 100048,China)

机构地区：[1]北京工商大学轻工科学与工程学院,北京100048 [2]中国轻工业聚合物发泡材料加工与应用重点实验室,北京100048

出　　处：《中国塑料》2024年第9期41-46,共6页China Plastics

基　　金：大学生科学研究与创业行动计划(G016)。

摘　　要：使用转矩流变仪将扩链剂CEAX8840、成核剂ST-NAB3与PLA熔融共混制备改性PLA,采用扫描电子显微镜、偏光热台显微镜、差示扫描量热仪、热变形仪、万能试验机以及冲击测试仪对改性PLA微观结构、结晶性能以及力学性能和耐热性进行了表征与测试。结果表明,CEAX8840和ST-NAB3的含量分别为6%(质量分数,下同)和1%时,PLA的晶体最小,密度最大,结晶温度提高到123.9°C,结晶度达到44.9%;此外,其冲击强度和热变形温度分别提高到了64.7 kJ/m2和84.9℃。PLA was melt-blended with a chain extender(CEAX8840)and a nucleating agent(ST-NAB3)by using a torque rheometer,and the microstructure,crystallization behavior,mechanical properties,and heat resistance of the modified PLA were characterized by suing scanning electron microscope,hot-plate polarizing microscope,differential scanning calorimeter,thermal deformation meter,universal testing machine,and impact tester.The results indicated that the modified PLA obtained the smallest crystal size at CEAX8840 and ST-NAB3 contents of 6 and 1 wt%,respec-tively;however,its crystal density was the highest.Moreover,the crystallization temperature and crystallinity degree of the modified PLA were increased to 123.9℃and 44.9%,respectively.In addition,its impact strength and thermal de-formation temperature were increased to 64.7 kJ/m2 and 84.9℃,respectively.

关 键 词：聚乳酸 扩链剂 成核剂 冲击强度 热变形温度 

分 类 号：TQ321[化学工程—合成树脂塑料工业]