Confinement effects on polymer crystallization: From droplets to alumina nanopores
Confinement effects on polymer crystallization: From droplets to alumina nanopores
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DOI：
10.1016/j.polymer.2013.05.029
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发表时间：
2013-07-19
期刊：
影响因子：
4.6
通讯作者：
Mueller, Alejandro J.
中科院分区：
文献类型：
--
作者：
Michell, Rose Mary;Blaszczyk-Lezak, Iwona;Mueller, Alejandro J.
我们回顾了以前关于聚合物限制结晶的工作，这些策略允许限制从微米到纳米级：液滴、共混物、嵌段共聚物和渗透到氧化铝纳米孔中。我们还介绍了新的结果，首次报道了均相成核和一级结晶动力学，在氧化铝纳米孔内渗透的均相聚合物和两嵌段共聚物中。随着限制程度的增加，与块体聚合物相比，限制可以在更高的过冷度下产生分级结晶或排他结晶。对于高度受限的无非均质微区或纳米区，整个结晶动力学以成核为主，因此成为一级动力学。成核机制由本体聚合物的非均相成核转变为受限和孤立的无异质微区或纳米微区的表面成核或均相成核。表面成核比均相成核更常见，尽管这一事实在文献中并不常见。(C)2013爱思唯尔有限公司。保留所有权利。
We review previous works on polymer confined crystallization employing strategies that allow confinement to go from the micron to the nanometer scale: droplets, blends, block copolymers and infiltration into alumina nanopores. We also present novel results, reporting homogeneous nucleation and first order crystallization kinetics, for the first time, in a homopolymer and a diblock copolymer infiltrated within alumina nanopores. Confinement can produce fractionated crystallization or exclusive crystallization at much higher supercoolings as compared to bulk polymers, as the degree of confinement increases. For highly confined heterogeneity free micro or nano-domains, the overall crystallization kinetics is dominated by nucleation and therefore becomes first order. The nucleation mechanism changes from heterogeneous nucleation for the bulk polymer to surface or homogeneous nucleation for ensembles of confined and isolated heterogeneity free micro or nanodomains. Surface nucleation is more commonly found than homogenous nucleation, although this fact is not frequently recognized in the literature. (C) 2013 Elsevier Ltd. All rights reserved.