Microdomain Structure and Crystallization Behavior in Dry-Brush Block Copolymer/Homopolymer Blends
| Autor: | Hung-Yu Chiu, 邱泓瑜 |
|---|---|
| Rok vydání: | 2004 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 92 To examine the microdomain structure and crystallization behavior in a crystalline-amorphous block copolymer/homopolymer blend system exhibiting dry brush phase behavior in the melt. A nearly symmetric poly(ε-caprolactone)-block-polybutadiene (PCL-b-PB) was blend with a PB homopolymer (h-PB)，and the melt morphology and crystallization behavior of the system was investigated as a function of weight fraction of PB by using Transmission Electron Microscopy (TEM)，Small Angle X-ray Scattering (SAXS) and Differential Scanning Calorimeter (DSC). In this dry brush system，h-PB was found to localize in the PB microdomain causing thickness expansion of the PB domain such that the lamellar identity of PCL microdomain was preserved. Even through the lamellar identity of PCL domain retained throughout the blend composition，the global structure of the lamellar unit transformed from lamellar to multilamellar spherical vesicles with increasing h-PB composition. The crystallization of PCL block was not severely confined in the blend，where the process was able to occur at the undercooling comparable to that of h-PCL. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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