Preparation of a novel alloy composed of fluorene-based polyester and polycarbonate and their properties for the optical uses
| Autor: | Toshikazu Takata, Kana Kobori, Masahiro Yamada, Yoshikazu Kondo, Shinichi Kawasaki, Fengzhe Jin, Hiroki Sakamoto |
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| Rok vydání: | 2009 |
| Předmět: |
Birefringence
Materials science Polymers and Plastics High-refractive-index polymer Alloy Analytical chemistry General Chemistry engineering.material Surfaces Coatings and Films Polyester visual_art Polymer chemistry Materials Chemistry engineering visual_art.visual_art_medium Polymer blend Polycarbonate Glass transition Refractive index |
| Zdroj: | Journal of Applied Polymer Science. 111:461-468 |
| ISSN: | 1097-4628 0021-8995 |
| Popis: | This paper is concerned with the structures and properties for fluorene-based polyester-polycarbonate (FBP/PC) alloys. Obtained alloys were characterized thermodynamically, optically, and viscoelastically, and the relationship between drawing behavior and molecular dynamics were also investigated. FBP/PC alloys showed transparent and a single glass transition temperature (Tg) for all compositions that indicated the complete compatibility in FBP/PC alloy systems. Tendency of the maximum draw ratios for alloy sheets was very similar to the profile of Tg versus FBP content. Maximum draw ratio was increased linearly with FBP content, demonstrating the intimate relationship between the large deformation and the molecular motion. A large amount of orientational birefringence occurred in PC sheet, but in the case of FBP/PC alloys and FBP, orientational birefringence was drastically decreased or not observed at all. This meant that positive birefringence of PC molecules was compensated by the absolutely smaller birefringence of FBP molecules. From a molecular mobility perspective, relaxation time (T2) for PC was smaller even at 200°C. However, for FBP and its alloys, T2 were much larger, showing the considerably enhanced molecular mobility in FBP or FBP/PC alloys. In this study, we could first reveal that the relationship between Tg and FBP content was very similar to the behaviors of birefringence (Δn)/draw ratio (λ) versus FBP content, T2 versus FBP content and 1/maximum draw ratio (λmax) versus FBP content. Based on these results, we were able to propose a novel alloy with high refractive index, low orientational birefringence, and higher processability by alloying FBP with PC. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 |
| Databáze: | OpenAIRE |
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