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Confined Crystallization Behaviors and Crystallization Kinetics of Crystalline-Crystalline Block Copolymers in Bulk and Thin Film
发布时间:2013-9-12 点击次数:1240次

Confined Crystallization Behaviors and Crystallization Kinetics of Crystalline-Crystalline Block Copolymers in Bulk and Thin Film

 

 Jingjing Yang, Yongri Liang*, Charles C. Han*

 

Macromolecules, 2012, 45, 4254-4261;  Polymer2013, 54, 3974-3981.

 

The subject of crystallization in block copolymers has attracted much attention in the past few decades, since the crystallization is an important process to control the solid state structure and morphology in crystalline block copolymers. However, the aspects of crystallization behaviors and kinetics of crystalline-crystalline block copolymers in multi-length scales and confined spaces are still not fully understood so far. We used the melt-miscible crystalline-crystalline block copolymer of poly (L-lactide)-block-poly (ethylene glycol) (PLLA-b-PEG) as model material to investigated the crystallization behaviors in multi-length scales and 1D confined space with SAXS, WAXS, AFM and POM methods. For the PLLA-b-PEG bulk, we found that the PEG block crystallized not only in the interlamellar regions of PLLA crystals, but also in the interfibrillar regions of PLLA. However, the subsequent crystallization of PEG block did not alter the foregoing spherulitic morphology of PLLA on the micrometer scale. For the thin film, we found that the crystallization kinetics, morphology and crystal orientation of crystalline block copolymer thin films can be controlled by prior wetting process. The crystal nucleation and growth are strongly influenced by surface wetting induced coupling effects of surface energy, composition and chain alignments.

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