Simultaneously improving the fire performance and toughness of polylactic acid by reactive blending with castor oil-based polyurethane and ammonium polyphosphate
Simultaneously improving the fire performance and toughness of polylactic acid by reactive blending with castor oil-based polyurethane and ammonium polyphosphate
复制标题
与蓖麻油基聚氨酯和聚磷酸铵反应共混同时提高聚乳酸的防火性能和韧性
DOI：
10.1177/0734904119886258
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发表时间：
2020
影响因子：
1.9
通讯作者：
Fei Bin
中科院分区：
文献类型：
--
作者：
Zhang Sheng;Zhang Qingyu;Sun Jun;Gu Xiaoyu;Li Hongfei;Liu Xiaodong;Fei Bin
提出了一种同时提高聚乳酸复合材料阻燃性能和韧性的新方法，即通过反应共混引入蓖麻油型聚氨酯和聚磷酸铵。用傅里叶变换红外光谱证实了蓖麻油和甲苯二异氰酸酯在聚乳酸基质中的原位聚合。阻燃测试结果表明，20%聚磷酸铵的引入可以使聚乳酸复合材料的极限氧指数从19.3%提高到27.2%，UL-94等级从无等级提高到V-0等级，放热率峰值从505.5 kW/m2降低到337.0 kW/m2。此外，聚乳酸的韧性也得到显著改善，断裂伸长率和缺口冲击强度分别提高到37.0%和7.59 kJ/m2。讨论并提出了阻燃和增韧的可能机理。
A new method has been presented to simultaneously enhance both the flame retardancy and toughness of polylactide acid composites by introducing castor oil-based polyurethane and ammonium polyphosphate via reactive blending. The in situ polymerization of castor oil and toluene diisocyanate in the polylactide acid matrix has been confirmed by the Fourier transform infrared spectroscopy. The flame retardant test results indicate that the introduction of 20% ammonium polyphosphate can increase the limiting oxygen index of polylactide acid composites from 19.3% to 27.2%, upgrade the UL-94 rating from no rating to V-0, and decrease the peak heat release rate from 505.5 to 337.0 kW/m2. Moreover, the toughness of polylactide acid is also improved significantly, with the elongation at break and notched impact strength increasing to 37.0% and 7.59 kJ/m2, respectively. The possible mechanisms for both flame retardancy and toughness are also discussed and proposed.