Preparation and properties of chopped quartz f iber/ PMR polyimide composites
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摘要: 采用湿法混合工艺制备了短切石英纤维增强的PMR 型聚酰亚胺复合材料模塑粉, 使用热模压一次成型技术制备了聚酰亚胺树脂基复合材料, 对复合材料的性能进行了系统研究。研究结果表明: 短切石英纤维增强的复合材料具有优异的热性能和良好的力学性能, 纤维含量对复合材料玻璃化转变温度和热失重温度影响不大,对材料的力学性能影响显著。复合材料具有优异的介电性能, 在1 kHz~18 GHz 宽频范围内具有稳定的介电常数和介电损耗。Abstract: The short quartz f iber reinforced polyimide composites (SQF/ PI) were prepared by thermal curing of B-stagedmolding powders , which were obtained by impregnating of short quartz f ibers with PMR monomer solution in ethyl alcoholfollowed by thermal baking up to 220 ℃. The experimental results demonstrate that the fully-cured SQF/ PI composites exhibit high thermal stability and good mechanical properties , and the f iber content has little influence on the thermal propertybut great influence on the mechanical property. The SQF/ PI composites show an excellent dielectric property , stabledielect ric constant and dissipation factor in the broad f requency range from 1 kHz to 18 GHz.
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Key words:
- polyimide /
- composites /
- dielect ric property /
- thermal property
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