Flame Retardant Modification of Polylactic Acid by Bio-Based Core-Shell Intumescent Flame Retardant Self-Assembled in Aqueous Phase

被引：0
|
作者：
Zhang Y. [1 ]
Xiong Z. [1 ]
Li X. [1 ]
Fang Z. [1 ,2 ]
机构：
[1] Lab of Polymer Materials and Engineering, NingboTech University, Ningbo
[2] MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou
来源：
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2020年 / 36卷 / 11期
关键词：
Core-shell flame retardant; Flame retardancy; Polylactic acid; Self-assembly; Toughening;
D O I：
10.16865/j.cnki.1000-7555.2020.0280
中图分类号：
学科分类号：
摘要：
Due to the problems such as the poor compatibility of bio-based flame retardant system and their complex synthesis processes with large amounts of organic solvents, the core-shell intumescent flame retardant APP@CS@PA-Na, with ammonium polyphosphate (APP) as "core", chitosan (CS) and sodium phytate (PA-Na) as "shell", was prepared by aqueous self-assembly method. The effects of different additions of APP@CS@PA-Na on flame retardancy, thermal degradation and mechanical properties of polylactic acid (PLA) were studied. The results show that when the mass fraction of APP@CS@PA-Na is 10%, PLA can pass the UL94 V0 and its limited oxygen index reaches 30.5%; the peak heat release rate and total heat release rate are decreased by 33.0% and 19.4% respectively. Through the residual char analysis, it is found that APP@CS@PA-Na can not only promote the charring of PLA, but also improve the phosphorus content and graphitization degree of the char. The amount of APP@CS@PA-Na is an important factor affecting the "quality" and "quantity" of the protective carbon layer. The thermal gravimetric analysis in N2 also show that it can promote the charring behavior. The appropriate amount of APP@CS@PA-Na could endow PLA with a certain toughening effect. The elongation at break and impact strength of PLA with 10% APP@CS@PA-Na are increased by 28% and 17% respectively compared with pure PLA. © 2020, Editorial Board of Polymer Materials Science & Engineering. All right reserved.
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页码：49 / 55
页数：6
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