Multiple melting behavior in isothermally cold-crystallized isotactic polystyrene
Multiple melting behavior in isothermally cold-crystallized isotactic polystyrene
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DOI：
10.1016/s0032-3861(01)00173-2
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发表时间：
2001-07-01
期刊：
影响因子：
4.6
通讯作者：
Petermann, J
中科院分区：
文献类型：
--
作者：
Liu, T;Petermann, J
用差示扫描量热法(DSC)和透射电子显微镜(TEM)研究了玻璃态等温结晶的全同立构聚苯乙烯(IPS)的多重熔融行为和片层形态。研究了不同实验参数(结晶温度、结晶时间、升温速率)对iPS熔融行为的影响。热分析和形态分析相结合的结果表明：(1)退火峰并不像文献中通常所说的那样与二次结晶形成的次级晶体的熔化有关；(2)在单个片层中具有不同完善程度的两个片层群是导致iPS中所谓的双重熔化行为的原因。用透射电子显微镜在片层水平上观察了iPS晶体的部分熔融和再结晶修复过程。根据所获得的量热和形态结果，讨论了几种结晶和随后熔化模型的适用性。(C)2001爱思唯尔科学有限公司。保留所有权利。
The multiple melting behavior and lamellar morphologies of isotactic polystyrene (iPS) isothermally crystallized from the glassy state have been investigated by differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). The influences of different experimental variables (such as crystallization temperature and time, heating rate) on the melting behavior of iPS are studied. The combination of thermal analysis and morphological results indicates that: (1) the 'annealing peak' is not associated with the melting of subsidiary crystals formed by secondary crystallization as often suggested in the literature; (2) two lamellar populations with different degrees of perfection within a single lamella are responsible for the so-called double melting behavior in iPS. The partial melting and repairing (via recrystallization) of iPS crystals are observed on lamellar level by TEM observations. From the obtained calorimetric and morphological results, the applicability of several crystallization and (subsequent) melting models is discussed. (C) 2001 Elsevier Science Ltd. All rights reserved.