| 학회 | 한국고분자학회 |
| 학술대회 | 2004년 가을 (10/08 ~ 10/09, 경북대학교) |
| 권호 | 29권 2호, p.90 |
| 발표분야 | 고분자 구조 및 물성 |
| 제목 | Orientation-induced crystallization of PET fibers in the presence of ‘frozen-in’ phase |
| 초록 | Poly(ethylene terephthalate) (PET) has a high glass transition temperature and a slow crystallization rate, which enables one to make nearly ‘frozen-in’ amorphous PET and thus easy to control the final morphology. Accordingly, many workers reported the evolutions of cold-crystallization process of quenched amorphous PET. In the present study, an in-situ wide angle X-ray diffraction was utilized. to elucidate the morphological and structural origin of orientation-induced crystallization for ‘frozen-in’ semicrystalline fibers, The ‘frozen-in’ semicrystalline fibers were manufactured by short-term aging at 150~190oC for 0.1 seconds and fast air quenching. As a result of WAXD analysis, we can explicitly divide the ‘frozen-in phase’ into the three phase such as ‘frozen-in’ isotropic amorphous, ‘frozen-in’ oriented noncrystalline phase and crystalline phase. The results clearly show that the crystallization is accelerated by thermodynamically unfavorable ‘frozen-in’ phase. In case of crystallization of the isotropic amorphous phase imbedded in crystallites, the crystallization is assumed to be retarded by the existence of ordered domains and crystallites. In particular, an unfavorable quenched stress and strain stored in the frozen-in phase could be detected by thermomechanical experiment. Also, during orientation-induced crystallization, spontaneous elongation is accompanied and is originating from gauche to trans conformational transformation (crystallization). |
| 저자 | 송현훈 |
| 소속 | 한남대 |
| 키워드 | strain induced crystallization; frozen-in phase; PET |
