Improved Flame-Retardant Properties of Poly(lactic acid) Foams Using Starch as a Natural Charring Agent

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• 作者：Jingjing Wang ; Qian Ren ; Wenge Zheng ; Wentao Zhai
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：January 29, 2014
• 年：2014
• 卷：53
• 期：4
• 页码：1422-1430
• 全文大小：735K
• ISSN：1520-5045

文摘

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鈥?5 wt % FR increased the limiting oxygen index (LOI) of PLA foams from 18.2% to 24.8鈥?8.4% and simultaneously increased the foam expansion of PLA foams from 4.4 to 7.5鈥?6.0. The addition of starch with content of 1鈥? 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.