Dynamical observation of structural transition of polymers using an X-ray diffraction system with imaging plates. II. Crystalline transition of poly(butylene terephthalate)
✍ Scribed by Akiyoshi Kawaguchi; Shozo Murakami; Masaki Fujiwara; Yukihiro Nishikawa
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 285 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0887-6266
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✦ Synopsis
Poly(butylene terephthalate) has two crystalline forms of ␣ and . The ␣ form is more stable and is transformed into the  form by stretching. The ␣7 transition stress was measured at various temperatures with the use of an X-ray diffraction system with imaging plates, and the relationship between the transition stress and temperature was obtained. Further, using the X-ray diffraction system, the drawing behavior of the nearly amorphous, undrawn polymer film was observed by taking up dynamically a series of X-ray diffraction patterns while a film was being drawn. The ␣ form never occurred during drawing at any temperature because the stress to draw the film exceeded the ␣3 transition stress.