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首页> 外文期刊>Journal of Applied Polymer Science >Thermal Properties of a Thermoplastic Polyimide Blend
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Thermal Properties of a Thermoplastic Polyimide Blend

机译：热塑性聚酰亚胺共混物的热性能

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摘要

Differential scanning calorimetry and dynamic mechanical analysis of blends of a new thermoplastic polyimide (TPI) and poly (ether imide) (PEI) have confirmed the full miscibility of the system over the whole composition range. Annealing of the blends above the glass transition temperature of TPI, but below its crystallization temperature, did not produce a shift in the glass transiton, while physical ageing of the annealed blends also failed to reveal any indication of phase separaton. The rate of crystallization of TPI was slowed by the addition of PEI, and the temperaure of the maximum crystallization rate shifted upwards. The#beta#-relaxation behavior of the blends followed a linear trend between the response of the component polymers, while the low-temperature #gamma#_relaxation was unchanged by blending. The time scale of physical ageing of the blends did not behave in a linear fashion, and the enthalpy loss on ageing also deviated from the average.
机译：新型热塑性聚酰亚胺（TPI）和聚（醚酰亚胺）（PEI）的混合物的差示扫描量热法和动态力学分析已证实该系统在整个组成范围内具有完全的混溶性。将共混物进行高于TPI的玻璃化转变温度的退火，但低于其结晶温度，则不会引起玻璃态的转变，而退火后的共混物的物理老化也无法显示出相分离的迹象。加入PEI会降低TPI的结晶速度，并且最大结晶速度的温度会向上移动。共混物的＃beta＃-松弛行为遵循组分聚合物的响应之间的线性趋势，而低温＃γ＃_松弛通过共混没有变化。共混物物理老化的时间尺度不是线性变化的，并且老化时的焓损失也偏离平均值。

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