Birefringence and strain-induced crystallization of stretched cellulose acetate propionate films
| Autor: | Misaki Kondo, Hikaru Shimada, Shogo Nobukawa, Panitha Pulkerd, Masayuki Yamaguchi, Akichika Nakao, Kultida Songsurang |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Polymers and Plastics strain-induced crystallization 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention Crystal Crystallinity chemistry.chemical_compound law Materials Chemistry Crystallization wavelength dependence chemistry.chemical_classification Birefringence birefringence Organic Chemistry Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences Crystallography Cellulose triacetate chemistry Pyranose 0210 nano-technology Dispersion (chemistry) |
| Zdroj: | Polymer. 111:53-60 |
| ISSN: | 0032-3861 |
| DOI: | 10.1016/j.polymer.2017.01.027 |
| Popis: | We investigated wavelength dependence of birefringence (Δn) for cellulose acetate propionate (CAP) films stretched at various draw ratios (DRs) and strain rates (SRs), by comparing the result of cellulose triacetate (CTA). CAP exhibited an extraordinary wavelength dispersion of Δn although CTA showed an ordinary dispersion, indicating that Δn of CAP is determined by acetyl and propionyl groups. The extraordinary dispersion for CAP became stronger at larger DR and higher SR. The thermal analysis data suggested that the hot-stretching induces the crystallization of CAP and the crystal size increases with increasing DR and SR. Furthermore, two-dimensional X-ray diffraction pattern of CAP exhibited the orientation of the induced crystal as well as that of CTA, which is one of semi-crystalline polymers. These results mean that the acetyl orientation in CAP becomes stronger than the propionyl orientation. This conclusion is reasonable because acetyl group is more tightly confined to a pyranose ring than propionyl. |
| Databáze: | OpenAIRE |
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