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首页> 外文期刊>Journal of Applied Polymer Science >Temperature memory effect from below glass transition to up to melting range in an ethylene-vinyl acetate copolymer
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Temperature memory effect from below glass transition to up to melting range in an ethylene-vinyl acetate copolymer

机译：从低于玻璃过渡到乙烯 - 乙酸乙烯酯共聚物的熔化范围的温度记忆效应

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摘要

In this paper, the temperature memory effect (TME) in a commercial ethylene-vinyl acetate copolymer (EVA) is characterized via differential scanning calorimetry (DSC) tests. Three temperatures, which are 35, 60, and 85 degrees C representing temperatures below glass transition (T-g), within T-g and within melting (T-m), respectively, are included for the investigation. It is found that TME in polymers is not as reported to be limited at around either T-g or T-m only, the effective temperature range for TME could be actually much wider that covers from below T-g to up to T-m. In addition, it is concluded that higher heating stop temperature (T-s) erases the memory of previous lower ones in this EVA. Hysteresis (described by Delta T) between the temperature of turning points (T(t)s) and their corresponding T(s)s is always observable. However, the Delta T decreases at higher T-s.
机译：本文采用差示扫描量热法（DSC）对商品乙烯-醋酸乙烯酯共聚物（EVA）的温度记忆效应（TME）进行了表征。本研究包括三个温度，分别为35、60和85摄氏度，分别代表玻璃化转变（T-g）、T-g和熔化（T-m）以下的温度。研究发现，聚合物中的TME并非仅限于T-g或T-m左右，TME的有效温度范围实际上可以更宽，涵盖从T-g以下到T-m。此外，可以得出结论，较高的加热停止温度（T-s）会清除EVA中先前较低温度的记忆。转折点（T（T）s）的温度与其对应的T（s）s之间的滞后（用δT表示）总是可以观察到的。然而，T-s越高，δT越小。

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