高熔体强度聚乳酸的结晶和发泡性能

doi:10.11896/cldb.19110134

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Abstract In this paper, effects of the long-chain branched on the crystallization behavior, mechanical properties and foaming properties of linear PLA were studied in detail. Long-chain branched PLA (LCBPLA) was obtained by adding pentaerythritol triacrylate (PETA), dicumyl peroxide (DCP) and TETDS. In the torque rheometer, with the increase of PETA content, the mixing energy gradually increased, from 4.5 kJ to 7.25 kJ. The analyses of non-isothermal and isothermal crystallization show that the formation of the long-chain branched structure could significantly improve the crystallization performance of PLA. With the increase of PETA content (from 0% to 1%), the crystallinity of LCBPLA increased from about 3.5% to about 45%, the initial crystallization temperature increased from about 120 ℃ to about 143 ℃, and the crystallization rate also significantly increased. In addition, the formation of a long-chain branched structure also improved the mechanical properties of PLA to some extent, from 68.8 MPa to 82.7 MPa, because the long-chain branched structure can form a network structure. It was found that modified PLA had better foaming property by supercritical CO₂ at different foaming temperatures. Compared with pure PLA, the foaming ratio and foam size of modified PLA were significantly increased. The foaming ratio of PLA was increased from 8.7 to 30.5 at 155 ℃.

Key words： poly (lactic acid) crystallization long-chain branched structure mechanical properties foaming properties

Published: 06 November 2020

CLC number:

TB332

Fund:Fund of Education Department of Shaanxi Province(20JK0564) and China Postdoctoral Science Foundation (2020M673585XB).

About author:: Zhongguo Zhaois a lecturer at Shaanxi University of Technology. From September 2013 to July 2019, he obtained the master’s degree and doctor’s degree in the College of Polymer Science and Engineering, Sichuan University. After graduation, he works at Shaanxi University of Technology. He has published more than 16 papers in academic journals at home and abroad, including 5 SCI papers as the first author and 3 international conference papers, applied 5 national invention patents and 3 of them were authorized. His research interests focus on the research of polymer high performance and sensor applications. He has participated in a number of national natural fund projects, horizontal projects, and China-UK bridge projects.

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	ZHAO Zhongguo
	ZHANG Xin
	CHENG Shaohua
	WANG Miao
	LIANG Panxu
	LI Wanshun
	JIA Shikui

Cite this article:

ZHAO Zhongguo,ZHANG Xin,CHENG Shaohua, et al. Crystallization and Foaming Properties of High-melt-strength Poly (lactic acid)[J]. Materials Reports, 2020, 34(20): 20182-20186.

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http://www.mater-rep.com/EN/10.11896/cldb.19110134 OR http://www.mater-rep.com/EN/Y2020/V34/I20/20182

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