炭化
阻燃剂
极限氧指数
发泡剂
淀粉
材料科学
聚乳酸
乳酸
膨胀率
发泡剂
化学工程
复合材料
聚合物
烧焦
化学
热解
有机化学
多孔性
细菌
工程类
生物
聚氨酯
遗传学
作者
Jingjing Wang,Qian Ren,Wenge Zheng,Wentao Zhai
摘要
High expansion ratio, well-defined cell structure, and an excellent flame retardant characteristic are essential properties for broadening the applications of polymeric foam. In this study, by applying microcellular foaming technology using compressed CO2 as the blowing agent, we are challenged to synthesize the desirable poly(lactic acid) (PLA) foams with phosphorus-containing flame retardant (FR) and starch as the natural charring agent. It was interesting to find that the introduction of 15–25 wt % FR increased the limiting oxygen index (LOI) of PLA foams from 18.2% to 24.8–28.4% and simultaneously increased the foam expansion of PLA foams from 4.4 to 7.5–16.0. The addition of starch with content of 1–5 wt % further increased the LOI up to 30.6% and also endowed PLA/FR/St foams with improved antidripping properties. All these wonderful characteristics make the prepared PLA foams very promising for application in green packaging.
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