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高速导弹要求材料能承受650℃的高温。目前所用的聚酰亚胺不能承受这样高的温度,而聚苯并咪唑(PBI)在650℃下短期使用时具有令人满意的性能。过去,使用昂贵的高压罐加工工艺来制造聚苯并咪唑复合材料结构,这种工艺制造出的典型结构,其孔隙率超过允许的范围。然而,利用成本低的非高压罐加工工艺能够将聚苯并咪唑制成质量高、孔隙率低的结构。本文讨论了聚苯并咪唑复合材料的化学性能,流变性能以及加工工艺。
High-speed missiles require materials can withstand 650 ℃ high temperature. Currently used polyimides can not withstand such high temperatures, while polybenzimidazole (PBI) has satisfactory performance when used at 650 ° C for a short period of time. In the past, polybenzimidazole composite structures were manufactured using expensive high-pressure tank processing techniques that produced typical structures with porosity beyond the allowable range. However, polybenzimidazole can be made into a high-quality, low-porosity structure using a low-cost, non-high pressure tank processing process. This article discusses the chemical properties of polybenzimidazole composites, rheological properties and processing technology.