采用不同含量玻璃纤维/聚醚酰亚胺制备高性能复合材料,对其超低温(-253℃)线胀系数进行深入研究,并对其常温下的热导率、力学性能进行比较.结果表明,玻璃纤雏质量分数为30%时,复合材料的综合性能优异,其典型性能如下:低温线胀系数纵向为2.16×10~(-5)/K,横向为3.03×10~(-5)/K,热导率为0.31W/(m·K),拉伸强度为158 Mpa,弯曲强度为264 Mpa,无缺口冲击强度为4.24 J/cm~2.
The paper introduces high-performance composite made of different content of glass fiber reinforced thermoplastic Polyetherimide. By thoroughly investigating thermal expansion coefficient (CTE)at cryogenic temperature( -253℃) and comparing between thermal conductivity and mechanical performance at ambient temperature, the result shows that glass fiber content is up to 30%, longitudinal CTE is 2.16×10~(-5)/K, transverse CTE is 3.03×10~(-5)/K,thermal conductivity is 0.31W/(m·K),tensile strength is 158 MPa,flexural strength is 264 MPa and nonnotch impact strength is 4.24 J/cm~2.
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