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 poly lactic acid

丁馨怡 ¹顿东星 ¹秦骏熙 ¹陈钰蕾 ¹韩羽菲 ¹张玉霞 ¹周洪福¹

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作者信息

1. 北京工商大学轻工科学与工程学院,北京 100048;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
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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 ℃,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℃.

Abstract

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

Key words

poly(lactic acid)/chain extender/nucleating agent/impact strength/thermal deformation temperature

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出版年

2024

中国塑料

中国塑料加工工业协会轻工业塑料加工应用研究所北京工商大学

中国塑料

CSTPCD北大核心

影响因子：0.574

ISSN：1001-9278

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