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Morphological and Physical Properties of Randomly Coupled Multiblock Copolymers: Bisphenol-A Polycarbonate–Poly(oxyethylene) Systems
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Toshitake Suzuki1) and Tadao Kotaka1)
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1) Department of Macromolecular Science, Faculty of Science, Osaka University
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ABSTRACT: For randomly coupled (AB)n type multiblock copolymers of bisphenol-A polycarbonate (PC) and poly(oxyethylene) (POE) with varying PC/POE composition and block length, crystallization, melting, and microphase separation were examined by DSC, dynamic mechanical and stress-strain measurements, dielectric relaxation measurements, and polarizing optical microscopy. These processes were strongly dependent on PC/POE composition and block length. The microphase separation became more significant with increasing block length, and various phases (such as PC and POE crystalline and amorphous phases) appeared depending on PC/POE composition. In the copolymers with high POE content (\gtrsim70%), a spherulitic structure was found. The spherulites appeared to consist of POE crystallites, POE amorphous segments and PC stacking regions. The PC stacking regions imparted to the specimen toughness against deformation and behaved as crosslinks after the spherulites underwent destruction by stretching of the specimens.
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Keyword: Multiblock Copolymer/ Bisphenol-A Polycarbonate–Poly(oxyethylene) Copolymer/ Microphase Separation/ Dynamic Mechanical Property/ Stress-Strain Curve/ Dielectric Relaxation/ Spherulitic Structure
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Published online: March 03, 2006 |
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© Copyright, 2006 by The Society of Polymer Science, Japan |
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