Simultaneously enhanced fracture toughness and flame‐retardant property of poly(l‐lactic acid) via reactive blending with ammonium polyphosphate and in situ formed polyurethane,Polymer International

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Simultaneously enhanced fracture toughness and flame‐retardant property of poly(l‐lactic acid) via reactive blending with ammonium polyphosphate and in situ formed polyurethane
Polymer International ( IF 2.9 ) Pub Date : 2020-07-28 , DOI: 10.1002/pi.6053
Meng Ma ₁ , Xinpeng Wang ₁ , Kai Liu ₁ , Si Chen ₁ , Yanqin Shi ₁ , Huiwen He ₁ , Xu Wang ₁

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The preparation of poly(l‐lactic acid) (PLLA) with high mechanical and ideal flame‐retardant properties is a great challenge. Herein, a simultaneous toughness and flame‐retardant PLLA composite was successfully fabricated by using a one‐step process which introduces 4,4′‐methylenediphenyl diisocyanate and ammonium polyphosphate (APP) into PLLA/poly(ε‐caprolactone) blends. SEM, Fourier transform infrared spectroscopy and TGA were adopted to confirm that APP participated in the in situ reaction during the melt process. The impact strength was increased to 13.5 kJ m⁻² from 1.0 kJ m⁻² for L8P2A5 composite, indicating the toughening effect of reactive blending. The cone calorimeter test, limiting oxygen index and vertical burning test results indicate that the flame‐retardant properties of the composites are enhanced with increasing APP content. This work provides a method to prepare PLLA with high mechanical properties and enhanced flame retardancy. © 2020 Society of Chemical Industry

中文翻译：

通过与多磷酸铵和原位形成的聚氨酯反应共混，同时提高聚乳酸的断裂韧性和阻燃性能

具有高机械和理想阻燃性能的聚（l-乳酸）（PLLA）的制备是一个巨大的挑战。在此，通过一步法成功地制造了同时具有韧性和阻燃性的PLLA复合材料，该工艺将4,4'-亚甲基二苯基二异氰酸酯和聚磷酸铵（APP）引入PLLA /聚（ε-己内酯）共混物中。采用SEM，傅立叶变换红外光谱和TGA证实了APP在熔融过程中参与了原位反应。的冲击强度提高到13.5千焦米^-2 1.0千焦耳米^-2对于L8P2A5复合材料，表明反应混合的增韧作用。锥形量热仪测试，极限氧指数和垂直燃烧测试结果表明，复合材料的阻燃性能随APP含量的增加而增强。这项工作提供了一种制备具有高机械性能和增强的阻燃性的PLLA的方法。©2020化学工业协会

更新日期：2020-07-28

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