PPS/PES共混物及其碳纤维复合材料内耗行为的研究
AN INVESTIGATION ON THE INTERNAL FRICTION CHARACTERISTICS OE PPS/PES BLENS AND THEIR COMPOSITES REINFORCED BY CARBON FIBER
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摘要: 本工作利用内耗测量方法研究了PPS/PES共混物及其碳纤维复合材料的相容性以及多重转变和松弛行为,结果表明:(1)PPS与PES存在分子运动水平上的相互作用,共混组份比是决定其相互作用程度的重要因素;(2)PPS/PES共混物及其碳纤维复合材料中的PES相的β转变与松弛的时间存在较宽的连续分布,其分布宽度随共混组份比变化而变化,当PES相对含量为80%时,松弛时间分布宽度出现最大值;(3)PPS/PES共混物及其碳纤维复合材料处于热力学亚稳态,热处理增大了PPS与PES的相分离程度,减弱了它们之间的相互作用;(4)低温区热历史对PPS玻璃化转变有较大影响,内耗峰高及峰温随起始测量温度的升高而下降。
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关键词:
- PPS/PES共混物 /
- 碳纤维增强PPS/PES复合材料 /
- 内耗行为 /
- 两相相互作用 /
- 松弛时间分布
Abstract: The compatibility,multiple transition and relaxation behaviour of PPS/PES blends and their composites reinforced by carbon fiber (CFPPS/PES) have been studied by internal friction analysis method.The experimental results show that;(1)there is interaction on a molecular-scale between PPS and PES in the blends and the blending ratio is the key facfor to determine the degree of such interaction;(2) there is a rather wide continuous distribution of relaxation times for the secondary relaxation of PES in both the blends and the composites,and the half-width of the relaxation time distribution function for the relaxation process changes with the blending ratio and reaches maximum in the case of 80% PES;(3)PPS and PES are thermodynamically metastable,and heat treatment increases the degree of phase separation of PPS from PES and weakens phase interaction;(4) low temperature therms,l history exerts considerable influence on the glass transition of PPS,the peak height and peak temperature of which decrease with a rise in starting temperature. -
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