甲基二苯乙炔基硅烷改性聚苯并咪唑

Modification of PBI by Methyl-di-phenylacetylene-silane

以一种新型耐高温树脂聚甲基二苯乙炔基硅烷(MDPES)通过共混改性聚苯并咪唑(PBI)树脂,提高了PBI树脂的熔融性并延长了树脂熔融状态的时间,改善了PBI树脂的加工性能。同时PBI优良的耐热性保持不变,并降低了树脂吸水率。通过比较不同配比的改性树脂发现,当MDPES/PBI质量比为4/5时,改性效果较好,氮气中的Td5=579℃,所制备的复合材料常温弯曲强度为240.9MPa,240℃弯曲强度保留率为84.1%,吸水率下降为纯PBI的一半。

Polybenzimidazole （PBI） was modified by means of blending with a novel heat-resistant resin methyl-di-phenylacetylene-silane （MDPES）, by which the meltability of PBI was irnpoved, and the time of the melting stage of PBI was prolonged, resulted in improvement of the process,ability of PBI, meanwhile the heat resistance of PBI did not decline, and the water absorption of PBI was lowered. It was found that when the mass ratio of MDPES/PBI was 4：5, the modification was ideal, and the value of Td5 （temperature of 5% weight loss） was 579 ℃ in nitrogen, the bending strength of the prepared composite at room temperature was 240.9 MPa, the bending strength retention of the composite at 240 ℃ was 84.1%, and the water absorption of the composite was lowered to be a half of that of the pure PBI.