SOME ASPECTS OF NONISOTHERMAL CRYSTALLIZATION OF POLYMER .1. RELATIONSHIP BETWEEN CRYSTALLIZATION TEMPERATURE, CRYSTALLINITY, AND COOLING CONDITIONS
SOME ASPECTS OF NONISOTHERMAL CRYSTALLIZATION OF POLYMER .1. RELATIONSHIP BETWEEN CRYSTALLIZATION TEMPERATURE, CRYSTALLINITY, AND COOLING CONDITIONS
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DOI：
10.1002/app.1972.070160503
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发表时间：
1972-01-01
影响因子：
3
通讯作者：
KATAYAMA, K
中科院分区：
文献类型：
--
作者：
NAKAMURA, K;WATANABE, T;KATAYAMA, K
在非等温结晶过程中的温度和结晶度的聚合物的变化进行了理论分析，假设在冷却条件下，热传递发生在聚合物和环境之间的温度差成比例的速率。当结晶过程中温度变化出现平台时，可以通过简单的方法预测结晶温度。该方法给出的值与通过在整个过程中连续计算温度和结晶度得到的值几乎相同。此外，还提出了一种预测结晶温度的图解法。通过使用熔融纺丝实验中观察到的平台温度，评估分子取向下的结晶速率。此外，提出了一种适用于估算极限结晶度的方法。对聚对苯二甲酸乙二醇酯的超高速纺丝进行了分子取向下结晶速率增加的粗略估计。
The changes in temperature and crystallinity of polymer during nonisothermal crystallization were theoretically analyzed assuming a cooling condition under which heat transfer occurs at a rate proportional to the difference in temperature between polymer and the environment. When a plateau appears in the temperature change during crystallization, crystallization temperature can be predicted by a simple method. This method gives nearly the same value as that obtained by successive calculations of temperature and crystallinity throughout the whole process. In addition, a graphic method is presented to predict crystallization temperature. By using the plateau temperature observed in melt‐spinning experiments, the crystallization rate under molecular orientation is evaluated. Furthermore, a method applicable to estimating the ultimate crystallinity is proposed. A rough estimation of the increase in the rate of crystallization under molecular orientation was carried out for very high‐speed spinning of poly(ethylene terephthalate).