Morphology of mesophase and crystals of polyamide 6 prepared in a fast scanning chip calorimeter
Morphology of mesophase and crystals of polyamide 6 prepared in a fast scanning chip calorimeter
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DOI：
10.1016/j.polymer.2012.06.045
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发表时间：
2012-08-17
期刊：
影响因子：
4.6
通讯作者：
Schick, Christoph
中科院分区：
文献类型：
--
作者：
Mileva, Daniela;Androsch, Rene;Schick, Christoph
采用原子力显微镜（AFM）研究了聚酰胺6（PA 6）的成核/结晶途径对有序相形态的影响。PA 6样品在熔体不同过冷度下结晶或有序化，分别获得α-晶体或γ-中间相。为了改进成核途径的控制，首次使用快速扫描芯片量热计（FSC）制备用于AFM分析的样品。发现低过冷度下的熔体结晶与层状相的形成有关，而高过冷度下形成的中间相为非层状相。在冷结晶的情况下，最终的半结晶结构取决于加热速率;缓慢加热首先导致中间相结节的形成，然后在升高的温度下重新组织成晶体，而快速加热抑制中间相的形成，并允许过冷液体直接转化为层状。使用FSC的AFM样品制备的一般方法已被证实的有序/结晶的热路径上的全同立构聚丙烯的结构的影响的分析。(C)2012爱思唯尔有限公司保留所有权利。
Atomic force microscopy (AFM) has been employed to study the effect of the pathway of nucleation/crystallization on the morphology of the ordered phase of polyamide 6 (PA 6). Samples of PA 6 were crystallized or ordered at different supercooling of the melt, to obtain either alpha-crystals or gamma-mesophase, respectively. For improved control of the nucleation pathway, samples for AFM analysis were for the first time prepared using a fast scanning chip calorimeter (FSC). It has been found that melt-crystallization at low supercooling is connected with the formation of lamellae, while the mesophase formed at high supercooling is of non-lamellar shape. In case of cold-crystallization, the final semicrystalline structure depends on the heating rate; slow heating first leads to formation of mesophase nodules which then reorganize to crystals at elevated temperature, while fast heating suppresses the formation of mesophase and allows direct transformation of supercooled liquid to lamellae. The general approach of using FSC for AFM sample preparation has been confirmed by analysis of the effect of the thermal pathway of ordering/crystallization on the structure of an isotactic polypropylene. (C) 2012 Elsevier Ltd. All rights reserved.