Crystallization-Induced Structure Fluctuation of Crystallized Microdomain Structure Composed of Strongly Segregated Crystalline-Crystalline Diblock Copolymers
Crystallization-Induced Structure Fluctuation of Crystallized Microdomain Structure Composed of Strongly Segregated Crystalline-Crystalline Diblock Copolymers
复制标题
由强偏析结晶-结晶二嵌段共聚物组成的结晶微域结构的结晶诱导结构波动
DOI：
10.1016/j.polymer.2016.09.024
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发表时间：
2016
期刊：
影响因子：
4.6
通讯作者：
Atsushi Takahara
中科院分区：
文献类型：
--
作者：
Shiki Nojima;Yuji Higaki;Ryohei Ishige;Hirofumi Kabayama;Noboru Ohta;Hiroyasu Masunaga;Tomoyasu Hirai;Ken Kojio;Atsushi Takahara
研究了由强偏析结晶-结晶二嵌段共聚物聚（乙二醇）-嵌段-聚（全氟辛基丙烯酸乙酯）（PEG-b-PFA-C8）组成的结晶微域结构中结晶引起的层厚度方向的结构波动和预结晶结构的无序。通过原位分辨同步 SAXS/WAXD 测量和热分析来监测等温结晶过程中的结构形成过程。在等温结晶早期，PEG层状晶体在层状微相分离形态下的三维生长引起了PEG相的体积收缩，导致PEG层厚度减少、PFA-C8层厚度增加以及预结晶PFA-C8晶体无序化。在等温结晶后期，PEG层状晶体的一维生长、增厚导致PEG层厚度增加和PFA-C8层厚度减少。结晶微区结构中的结构波动取决于晶体生长尺寸。
Crystallization-induced structure fluctuations in the layer thickness direction and disordering of pre-crystallized structure in crystallized microdomain structure that consist of a strongly segregated crystalline-crystalline diblock copolymer, poly(ethylene glycol)-block-poly(perfluorooctyl ethyl acrylate) (PEG-b-PFA-C8), were investigated. The structure formation process during isothermal crystallization was monitored byin-situtime-resolved simultaneous SAXS/WAXD measurements and thermal analysis. At early stage of isothermal crystallization, three dimensional growth of the PEG lamellar crystals within lamellar microphase-separated morphology induced the volume shrinkage of PEG phase, resulting in the reduction of PEG layer thickness, increase of PFA-C8layer thickness and disordering of pre-crystallized PFA-C8crystals. At late stage of isothermal crystallization, one dimensional growth, thickening of PEG lamellar crystals induced the increase of PEG layer thickness and reduction of PFA-C8layer thickness. The structure fluctuation in the crystallized microdomain structure depends on the crystal growth dimension.