石英纤维/含硅芳炔复合材料的制备与性能

Preparation and Performance of Quartz Fiber/Silicon-Containing Arylacetylene Composites

摘要: 采用DSC、FTIR、TG和流变仪对含硅芳炔树脂(PSA)的固化反应特性、热稳定性以及流变性能进行了表征和分析。以石英纤维(QF)为增强体，采用模压成型工艺制备了QF/PSA复合材料。研究了树脂含量、成型压力、固化温度等不同工艺参数对QF/PSA复合材料力学性能的影响，在此基础上确定了复合材料的成型工艺参数：树脂含量30%，成型压力3.0~4.0 MPa，固化温度为250℃。考察了QF/PSA复合材料300℃和500℃高温下的力学强度以及复合材料在RT-500℃和7~18GHz范围内的介电性能。结果表明，PSA树脂5%热失重温度(Td5)为600℃，10%热失重温度(Td10)为715℃，800℃残炭率为86.3%。所得QF/PSA复合材料具有良好的高温力学性能：300℃下力学强度保持率高于69%，500℃下力学强度保持率高于51%。QF/PSA复合材料在RT~500℃和7~18 GHz的宽频范围内具有稳定的介电常数和介电损耗。

Abstract: The curing reaction characteristics, thermal stability and rheological Properties of Silicon-con- taining Arylacetylene resin (PSA) were characterized and analyzed by DSC, FTIR, TG and rheome-ter. The QF/PSA composites were prepared by compression molding process with Quartz Fiber (QF) as reinforcement. The effects of different process parameters (resin content, molding pres-sure, curing temperature) on mechanical properties of QF/PSA composites were studied as follows: the resin content 30%, the molding pressure 3.0~4.0 MPa, curing temperature 250˚C. On this basis, the molding process system of composites was determined. The mechanical strength of QF/PSA composites at 300℃and 500℃and the dielectric properties of the composites in the range of RT-500℃and 7~18GHz were investigated. According to the results, the decomposition temperature of 5% loss (Td5) and the decomposition temperature of 10% loss (Td10) of the cured PSA are 600˚C and 715˚C, and its residue rate is up to 86.3% at 800˚C. The prepared QF/PSA composites exhibit excellent high temperature mechanical properties: the retention rate of mechanical strength at 300˚C is above 69% and the retention rate of mechanical strength at 500˚C is above 51%. QF/PSA composites show stable dielectric constant and dielectric loss in the temperature range from room temperature to 500˚C and the broad frequency from7GHz to 18 GHz.