Abstract

New phthalonitrile resins that provide processing properties at the level of epoxy resins and composites obtained from them are discussed. The processing parameters of the resins are improved due to the discovery of reactive diluents based on bisbenzonitriles. By introducing these comonomers into the resin composition the melt viscosity is reduced to less than 100 MPa s at a temperature of 120°C, which allows one to obtain carbon fibers by modern injection techniques. The curing programs of the composite are selected in order to attain the maximum compressive strength (852 MPa). Carbon fiber reinforced plastics postcured at 375°C retain up to 90% of their mechanical properties at 400°C (τ₁₂ = 60–80 MPa). It is first shown that prepregs can be produced from phthalonitrile resins using the melt technology and composites from them can be obtained by hot pressing. Carbon fibers possess high limiting oxygen index values (LOI > 80%). Thus, phthalonitrile resins and prepregs are developed for non-autoclave processing of carbon and glass composites suitable for operation at elevated temperatures.

中文翻译：

---

基于双邻苯二甲腈和双苄腈的共聚物的耐热碳纤维增强塑料

摘要

讨论了可提供与环氧树脂和从其获得的复合材料相同水平的加工性能的新型邻苯二甲腈树脂。由于发现了基于双苄腈的反应性稀释剂，树脂的加工参数得到了改善。通过将这些共聚单体引入树脂组合物中，在120℃的温度下熔体粘度降低至小于100MPa s，这使得人们可以通过现代注射技术获得碳纤维。选择复合材料的固化程序以达到最大压缩强度（852 MPa）。碳纤维增强塑料在375后固化℃下保持高达它们的机械性能的90％，在400℃（τ ₁₂= 60–80 MPa）。首先表明，可以使用熔融技术从邻苯二甲腈树脂生产预浸料，并通过热压获得预浸料。碳纤维具有较高的极限氧指数值（LOI> 80％）。因此，开发了用于腈和腈纶预浸料的非高压釜处理，适用于碳和玻璃复合材料的高温操作。