玻璃纤维－环氧树脂预浸料的物理化学表征

PHYSICOCHEMICAL CHARACTERIZATION OF GLASS FIBER-EPOXY PREPREG DURING AGING

利用红外光谱等分析测试技术研究了Ｓ２高强玻璃纤维－环氧树脂预浸料在不同温度储存条件下，微观结构变化与储存温度之间的关系和在常温储存条件下微观结构与宏观力学性能之间的关系，从而为选择预浸料储存条件提供依据，为预浸料的质量控制提供控制参数和量化指标。

Samples of glass fiber(S2 )-epoxy(JF-43)composite prepreg were exposed to 45℃,25℃,5℃ respectively and about 50 percent relative humidity for different periods up to l96 days, They were analyzed in depth using infrared spectroscopy(IR)and other chemical analysis in order to determine the extent of the chemical changes occurring and to study the relationship between chemical changes and temperatures of aging,All showed evidence of significant changes.The temperature of aging had a significant effect on prepreg chemical changes such as epoxy group content, insoluble content and so on.The same samples,which were exposed to 25℃ and about 50 percent relative humidity for different periods up to 77 days,were determined using IR and mechanical property instrument.A linear relationship could be discerned between epoxy group content and laminate mechanicalproperties such as flexural properties and tensile properties at a confidence level of 99 percentby linear regression to the data.The cured degree calculated from the epoxy index of prepreg would be used as a parameter of quality control;The quality index concerning the importanceof monitoring the aging by physicochemical methods was discussed.