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首页> 外文期刊>Journal of Applied Polymer Science >Fabrication of isocyanate-based polyimide foam by a postgrafting method
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Fabrication of isocyanate-based polyimide foam by a postgrafting method

机译：通过后化方法制备异氰酸酯基聚酰亚胺泡沫

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Density and flame retardancy controlled isocyanate-based polyimide foam was prepared by a postgrafting method. The first solution containing prepolymer that was synthesized by dianhydride and overdose isocyanates was added into the second solution containing dianhydride derivatives, water, catalysts, and surfactants. The possible reactions during preparation are discussed. The obtained Fourier transform infrared spectra indicate that an increased amount of imide rings was generated with increasing molar ratio of the anhydride/isocyanate groups. The size and walls of the cells became smaller and thinner with less carbon dioxide (CO2) escaping into the air during the first solution preparation process, as shown in scanning electron microscopy images. The thermogravimetric analysis curves demonstrated that the 5% weight loss temperature (T-5%) was greater than 289 degrees C, and the residual weight retention at 800 degrees C was more than 45%. In addition, differential thermogravimetry curves demonstrated that the thermal stability decreased with more byproducts in polyimide foams. The limiting oxygen index increased gradually from 30.63%+/- 0.56 to 48%+/- 0.50 with increasing molar ratio of the anhydride/isocyanate groups. Meanwhile, the density of obtained polyimide foams ranged from 38.31 kg/m(3)+/- 0.90 to 99.53 kg/m(3)+/- 10.85. When the molar ratio of anhydride/isocyanate groups ranged from 0.4 to 0.8, the prepared isocyanate-based polyimide foams all exhibit both great flame retardancy and lower density. (C) 2016 Wiley Periodicals, Inc.
机译：密度和阻燃控制的异氰酸酯基聚酰亚胺泡沫通过后化方法制备。将含有二酐合成的预聚物的第一溶液加入含有二酐衍生物，水，催化剂和表面活性剂的第二溶液中。讨论了准备期间的可能反应。所获得的傅里叶变换红外光谱表明，随着酸酐/异氰酸酯基团的摩尔比而产生增加的酰亚胺环量。如扫描电子显微镜图像所示，细胞的尺寸和墙体变得更小且较少的二氧化碳（CO2）逸出到空气中，如扫描电子显微镜图像所示。热重分析曲线证明，5％重量损失温度（T-5％）大于289℃，800℃的残余重量滞留大于45％。此外，差分热重曲线曲线证明，热稳定性随着聚酰亚胺泡沫中的更多副产物而降低。限制氧指数逐渐增加30.63％+ / - 0.56至48％+ / - 0.50，随着酸酐/异氰酸酯基团的摩尔比而增加。同时，所得聚酰亚胺泡沫的密度范围为38.31千克/米（3）+/- 0.90至99.53 kg / m（3）+/- 10.85。当酸酐/异氰酸酯基的摩尔比为0.4至0.8时，制备的异氰酸酯基聚酰亚胺泡沫均表现出极高的阻燃性和更低的密度。 （c）2016 Wiley期刊，Inc。

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