新型聚乙烯-<em>g</em>-聚乳酸接枝共聚物的合成与表征

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摘要报道了一类主链为聚乙烯(PE)共聚物,侧链为生物基聚乳酸(PLA)的新型接枝共聚物及其制备方法,并对接枝共聚物结构与性能进行了深入的表征。采用配位聚合与开环聚合相结合的方法,以羟基功能化的聚乙烯共聚物为主链,通过羟基引发L-丙交酯(L-LA)的开环聚合,从而获得聚乙烯-g-PLA接枝共聚物。通过控制单体比例和反应条件,可同时实现接枝共聚物的主链结构以及侧链结构调控。结果表明,少量PLA接枝链的引入可在不明显降低拉伸强度的情况下,有效地改善接枝共聚物的断裂伸长率。热性能表征发现侧链PLA的引入限制了主链聚乙烯的结晶,造成了接枝共聚物结晶温度以及熔点的下降。该接枝共聚物展现出了可用于PLA等生物基聚酯材料的增韧改性或共混增容剂的应用潜力,也为此类接枝共聚物的合成与性能调控提供了重要的参考。

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	蔡浩
	王行
	陈相见
	张坤玉
	潘莉

关键词：接枝共聚物合成聚乙烯聚乳酸

Abstract： Herein, a series of novel polyethylene-g-poly(lactic acid) graft copolymers were synthesized by combination of coordination polymerization and ring-opening polymerization methods. Using ethylene, hexene and omega-undecylenyl alcohol random copolymer as main chain, we successfully introduced the bio-polyester PLA as the side grafting chain initiated by hydroxyl group. By optimizing the reaction conditions and monomer ratio, the main chain structure and side chain length of the graft copolymer can be adjusted accordingly. The DSC and TGA results showed that introduction of PLA grafts confined the crystallization of PE in the main chains, which was beneficial for the ductility and processability of the copolymers. More interestingly, the break elongation of the graft copolymers increased by the PLA grafting chains. The thermal stability of the graft copolymers was mainly controlled by the main chain polyolefin. The graft copolymers showed widely potential application in toughening PLA and compatibilizing agent for the polyester blends.

Keywords： graft copolymer synthesis polyethylene poly(lactic acid)

Received 2021-03-30;

Fund:国家自然科学基金(21574097)。

Corresponding Authors: 潘莉,教授,E-mail:lilypan@tju.edu.cn;张坤玉,副教授,E-mail:kyzhang@tju.edu.cn。 Email: lilypan@tju.edu.cn;kyzhang@tju.edu.cn

About author: 蔡浩(1995-),男,硕士研究生,现从事聚烯烃合成与改性方面的研究。

引用本文:

蔡浩, 王行, 陈相见, 张坤玉, 潘莉.新型聚乙烯-g-聚乳酸接枝共聚物的合成与表征[J]. 化学工业与工程, 2022,39(4): 22-29

CAI Hao, WANG Xing, CHEN Xiangjian, ZHANG Kunyu, PAN Li.Synthesis and characterization of novel polyethylene-g-poly（lactic acid） graft copolymers[J]. Chemcial Industry and Engineering, 2022,39(4): 22-29

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