ABSTRACT

Here, composite based on quartz fibre-reinforced fluoro-polyimide was fabricated using a hot press process, which was reported having well thermal and dielectric properties. The polyimide exhibited extremely high glass transition temperature (T_g) up to 471°C, and 5% weight loss temperature (T₅) about 560°C both in nitrogen and air. Also, optimisation of processing parameters of composite was investigated. Moreover, the quartz fibre/polyimide composite possessed excellent high-temperature mechanical properties due to the high T_g. Importantly, the composite exhibited excellent dielectric performance. Especially, the dielectric constant values had remained basically unchanged of 3.43–3.46 at 400°C in the frequency range of 7–18 GHz, indicative of a remarkable wave-transmitting property. Besides, the transmission efficiency of the composite was up to 83% in the frequency range of 7 –18 GHz. This study can serve as a basis for rapid evaluation of the high heat resistance and waving-transmitting property polyimide composite in various application environments.

摘要

在这里，基于石英纤维增强的氟聚酰亚胺的复合材料是使用热压工艺制造的，据报道该复合材料具有良好的热和介电性能。聚酰亚胺在氮气和空气中均表现出极高的玻璃化转变温度（T _g）高达471℃，5%失重温度（T ₅）约为560℃。此外，还研究了复合材料加工参数的优化。此外，由于高Tg ，石英纤维_/聚酰亚胺复合材料具有优异的高温力学性能。. 重要的是，该复合材料表现出优异的介电性能。特别是在 7-18 GHz 频率范围内，400°C 时介电常数值基本保持在 3.43-3.46，表明其具有显着的透波性。此外，该复合材料在7-18 GHz频率范围内的传输效率高达83%。本研究可为快速评价高耐热性和透波性聚酰亚胺复合材料在各种应用环境中的应用奠定基础。