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Facile Preparation of Lightweight and Robust Polybenzoxazine Foams
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-03-27 , DOI: 10.1021/acs.iecr.0c00313 Shuai Zhang 1 , Jiapeng Zong 1 , Qichao Ran 1 , Yi Gu 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-03-27 , DOI: 10.1021/acs.iecr.0c00313 Shuai Zhang 1 , Jiapeng Zong 1 , Qichao Ran 1 , Yi Gu 1
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Lightweight and robust polybenzoxazine foams were prepared using a simple sol–gel method based on a commercially available benzoxazine monomer, BA-a, with hexamethylenediamine as a curing agent and methanol/chloroform as the solvent. By varying the initial concentrations of organic solutions, polybenzoxazine foams with densities of 0.2815 g/cm3 (F-20), 0.4798 g/cm3 (F-30), and 0.6731 g/cm3 (F-40) were prepared. Scanning electron microscopy (SEM) images revealed that all foams possessed open-cell structures, and the morphology of the pore walls can be readily tailored by initial concentrations. As a consequence of the porous structure, the polybenzoxazine foams showed a low dielectric constant (1.47 at 1 MHz for F-20), low dielectric loss (0.003 at 1 MHz for F-20), low thermal conductivity (0.0604 W/(m K) for F-20), and low coefficient of linear expansion value (55.1 ppm/°C for F-20). Moreover, foam F-40 showed a favorable Tg of 191.8 °C, char yield of 46.1%, and compressive strength of 71.74 MPa. The outstanding comprehensive performances make the polybenzoxazine foams prepared using this methodology good candidates as lightweight, robust, and thermally stable matrices for many functional applications.
中文翻译：
轻质和坚固的聚苯并恶嗪泡沫的简便制备
轻质和坚固的聚苯并恶嗪泡沫是使用简单的溶胶-凝胶法，基于市售的苯并恶嗪单体BA-a，以六亚甲基二胺为固化剂，甲醇/氯仿为溶剂制备的。通过改变有机溶液的初始浓度，聚苯并恶嗪泡沫的密度分别为0.2815 g / cm 3（F-20），0.4798 g / cm 3（F-30）和0.6731 g / cm 3（F-40）被制备。扫描电子显微镜（SEM）图像显示，所有泡沫均具有开孔结构，并且可以通过初始浓度轻松调整孔壁的形态。由于具有多孔结构，聚苯并恶嗪泡沫材料显示出低介电常数（F-20在1 MHz下为1.47），低介电损耗（F-20在1 MHz下为0.003），低导热率（0.0604 W /（m对于F-20）为K），线性膨胀系数值较低（对于F-20为55.1 ppm /°C）。另外，泡沫F-40显示出良好的T g。温度为191.8℃，炭收率为46.1％，抗压强度为71.74MPa。出色的综合性能使使用这种方法制备的聚苯并恶嗪泡沫成为轻巧，坚固和热稳定的基质的候选材料，可用于许多功能性应用。
更新日期：2020-04-24
中文翻译：
轻质和坚固的聚苯并恶嗪泡沫的简便制备
轻质和坚固的聚苯并恶嗪泡沫是使用简单的溶胶-凝胶法，基于市售的苯并恶嗪单体BA-a，以六亚甲基二胺为固化剂，甲醇/氯仿为溶剂制备的。通过改变有机溶液的初始浓度，聚苯并恶嗪泡沫的密度分别为0.2815 g / cm 3（F-20），0.4798 g / cm 3（F-30）和0.6731 g / cm 3（F-40）被制备。扫描电子显微镜（SEM）图像显示，所有泡沫均具有开孔结构，并且可以通过初始浓度轻松调整孔壁的形态。由于具有多孔结构，聚苯并恶嗪泡沫材料显示出低介电常数（F-20在1 MHz下为1.47），低介电损耗（F-20在1 MHz下为0.003），低导热率（0.0604 W /（m对于F-20）为K），线性膨胀系数值较低（对于F-20为55.1 ppm /°C）。另外，泡沫F-40显示出良好的T g。温度为191.8℃，炭收率为46.1％，抗压强度为71.74MPa。出色的综合性能使使用这种方法制备的聚苯并恶嗪泡沫成为轻巧，坚固和热稳定的基质的候选材料，可用于许多功能性应用。
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