Crystallization of poly(ethylene-co-octene):: II -: Melt memory effects on first order kinetics
Crystallization of poly(ethylene-co-octene):: II -: Melt memory effects on first order kinetics
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DOI：
10.1140/epje/e2005-00023-0
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发表时间：
2005-02-01
影响因子：
1.8
通讯作者：
Strobl, G
中科院分区：
文献类型：
--
作者：
Häfele, A;Heck, B;Strobl, G
聚乙烯-共辛烯结晶动力学的膨胀和x射线散射实验显示出明显的熔体记忆效应，即在冷却到结晶温度之前，等温线的形状和特征时间随着熔体温度的系统变化。温度范围的影响是有限的；结晶动力学在熔体温度T-m(l)以下和熔体温度T-m(h)以上保持恒定，仅在两者之间变化。分析表明，熔体记忆效应是由一阶结晶过程特征时间的变化引起的。该过程可被分配为将晶体填充到先前生成的前驱体结构的物体中。
Dilatometric and X-ray scattering experiments of the crystallization kinetics of a sample of poly(ethylene-co-octene) show pronounced melt memory effects, i.e., the shapes of isotherms and characteristic times vary systematically with the temperature of the melt prior to cooling to the crystallization temperature. The temperature range of the effect is limited; crystallization kinetics remains constant below a melt temperature T-m(l) and above a melt temperature T-m(h) and varies only in-between. Analysis shows that the melt memory effect is caused by a variation of the characteristic time of a first order crystallization process. The process can be assigned to the in-filling of crystallites into objects of a previously generated precursor structure.