长链型超支化聚合物对PLA/PPC共混体系的增容改性研究

doi:10.19491/j.issn.1001-9278.2019.02.001

中国塑料 ›› 2019, Vol. 33 ›› Issue (2): 1-7.DOI: 10.19491/j.issn.1001-9278.2019.02.001

• 材料与性能 • 下一篇

长链型超支化聚合物对PLA/PPC共混体系的增容改性研究

康凯尔，靳玉娟*，汪博，翁云宣

北京工商大学材料与机械工程学院

收稿日期:2018-09-17 修回日期:2018-09-26 出版日期:2019-02-26 发布日期:2019-03-26
基金资助:
国家自然科学基金青年项目（51503007）、 “十三五”时期北京市属高校高水平教师队伍建设支持计划（CIT&TCD 201804030）、2018年北京工商大学研究生科研能力提升计划项目

Study on Compatibilizing Modification of PLA/PPC Blends with Long-Chain Hyperbranched Polymer

KANG Kaier, JIN Yujuan*, WANG Bo, WENG Yunxuan

Received:2018-09-17 Revised:2018-09-26 Online:2019-02-26 Published:2019-03-26
Contact: School of Materials Science and Mechanical Engineering, Beijing Technology and Business University E-mail:jinyujuan@th.btbu.edu.cn

摘要/Abstract

摘要： 将“一步法”合成的超支化聚酯进行接枝改性，得到末端带有大量脂肪酸长链的超支化聚合物（长链型超支化聚合物，LCHBP），并采用红外光谱、核磁共振、羟值滴定等方法对其进行表征。以LCHBP为改性剂，对聚乳酸（PLA）/聚碳酸亚丙酯（PPC）进行不同程度的改性，制备了PLA/PPC/LCHBP熔融共混物，采用差示扫描量热仪、电子万能试验机、扫描电镜等，对其热性能、力学性能、断面形貌等进行表征。结果表明，加入不同含量的LCHBP后，共混体系的ΔTg出现不同程度降低，表明LCHBP的加入改善了PLA与PPC的相容性；与PLA/PPC体系相比，LCHBP的加入可使共混体系在保持拉伸强度基本不变的情况下，大幅提升断裂伸长率和冲击强度，其中当LCHBP的加入量为2.0 %时，冲击强度提高61 %，断裂伸长率提高367 %。

Abstract: A grafting modification was performed for the hyperbranched polyester synthesized by a “one-step” method to obtain a sort of hyperbranched polymer with a large number of long-chain stearic acid at the end (LCHBP), and the chemical structure of LCHBP was characterized by Fourier-transform infrared spectroscopy, nuclear magnetic spectroscopy and hydroxyl value titration. The polylactic acid (PLA)/polypropylene carbonate (PPC) blends were modified with LCHBP through melt blending, and then their thermal performance, mechanical properties and morphologies of fracture surface were investigated by using differential scanning calorimeter, electronic universal testing machine and scanning electron microscope. The results indicated that the ΔTg of PLA/PPC/LCHBP blends decreased significantly with the addition of LCHBP, indicating an improvement in compatibility of PLA and PPC. Compared to PLA/PPC binary blends, the PLA/PPC/LCHBP ternary blends showed a remarkable increase in elongation at break and impact strength, whereas their tensile strength remained unchanged. The tensile strength of ternary blends increased by 61 % and their elongation at break increased by 367 % with the addition of 2.0 wt% LCHBP.

康凯尔靳玉娟汪博翁云宣. 长链型超支化聚合物对PLA/PPC共混体系的增容改性研究[J]. 中国塑料, 2019, 33(2): 1-7.

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长链型超支化聚合物对PLA/PPC共混体系的增容改性研究

Study on Compatibilizing Modification of PLA/PPC Blends with Long-Chain Hyperbranched Polymer

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