Strength of polymer phase boundaries with large interfacial width: Effects of interfacial profile and phase separation morphology
| Autor: | Chi-Ju Chiang, Yi-Huan Lee, Hao‐Ching Chien, Yu-Ping Lee, Yao-Yi Cheng, Chia‐Hwa Chang, Wen-Pin Shih, Chun-Jie Chang, Chi-An Dai |
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| Rok vydání: | 2010 |
| Předmět: |
chemistry.chemical_classification
Toughness Materials science Polymers and Plastics Crazing Annealing (metallurgy) Polymer Condensed Matter Physics chemistry.chemical_compound chemistry Phase (matter) Polymer chemistry Volume fraction Materials Chemistry Copolymer Polystyrene Physical and Theoretical Chemistry Composite material |
| Zdroj: | Journal of Polymer Science Part B: Polymer Physics. 48:1834-1846 |
| ISSN: | 0887-6266 |
| Popis: | In this study, we investigate the effect of random copolymer additives on the interfacial profile, the lateral phase separation morphology, and the interfacial fracture toughness (G c ) between two immiscible polymers. The interface between polystyrene (PS)/poly(methyl methacrylate) (PMMA) was reinforced with a random copolymer mixture when two or more PS f -r-PMMA 1-f random copolymers with different volume fraction, f, were blended. For short annealing time ( 1 lm) from which crazes can be extensively initiated and developed, leading to a large interfacial fracture energy. With increasing annealing time, the random copolymer mixture self-organizes as multiple layers, with the composition that changes gradually from PS-rich layers to PMMA-rich layers across the interface, leading to a large interfacial width. However, within each layer, the random copolymer mixture microphase separates laterally into smaller domains ( |
| Databáze: | OpenAIRE |
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