Effect of thermomechanical history on the crystallization of poly(ether‐block‐amide)
Effect of thermomechanical history on the crystallization of poly(ether‐block‐amide)
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DOI：
10.1002/pen.21197
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发表时间：
2008-12
影响因子：
3.2
通讯作者：
B. Tavernier;J. Mewis;P. Puyvelde;M. Takenaka;B. Ernst;T. Hashimoto
中科院分区：
文献类型：
--
作者：
B. Tavernier;J. Mewis;P. Puyvelde;M. Takenaka;B. Ernst;T. Hashimoto
用流变光方法研究了APOLY(醚-嵌段-酰胺)的静态结晶和fl-ow诱导结晶。光学显微镜和小角光散射都被使用过。用流变仪和小角X射线光电子能谱(SAXS)研究了多嵌段共聚物的微相分离结构，并在180-1858℃发生了有序-无序转变。比较了成核数、球晶生长速率和结晶特征时间标度，并与相同摩尔质量的聚酰胺进行了比较。对于含有大部分酰胺段的聚醚-嵌段-酰胺，尽管球晶结构不同，但嵌段共聚物和均聚物在静态结晶过程中球晶的生长速度是相似的。当应用flow时，这两种材质的行为不同。fl的加入增加了均聚物的成核密度，但不增加嵌段共聚物的成核密度。
The quiescent and flow-induced crystallization of apoly(ether-block-amide) is studied by means of rheo-optical methods. Both optical microscopy and smallangle light scattering have been used. The multiblockcopolymer has a microphase-separated structure withan order–disorder transition at 180–1858C, as measuredwith rheometry and SAXS. The number of nuclei,spherulitic growth rates, and the characteristic timescale for crystallization are compared with that of apolyamide of similar molar mass. For the poly(ether-block-amide)—containing a majority of amide seg-ments—the growth rates of the spherulites duringquiescent crystallization are similar for the block co-polymer and the homopolymer, even if the spheruliticstructures are not the same. When flow is applied, thetwo materials behave differently. The flow increasedthe nucleation density in the homopolymer but not inthe block copolymer.