有哪些信誉好的足球投注网站Microscopically viewed structural change of PE during the isothermal crystallization from the melt II. Conformational ordering and lamellar formation mechanism derived from the coupled interpretation .pdfVIP
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Microscopically viewed structural change of PE during the isothermal crystallization from the melt II. Conformational ordering and lamellar formation mechanism derived from the coupled interpretation .pdf
Polymer 40 (1999) 7125–7135
Microscopically viewed structural change of PE during the isothermal crystallization from the melt
II. Conformational ordering and lamellar formation mechanism derived from the coupled interpretation of time-resolved SAXS and FTIR data
Sono Sasakia, Kohji Tashiroa,*, Masamichi Kobayashia, Yoshinobu Izumib, Katsumi Kobayashic
aDepartment of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan bGraduate School of Engineering, Yamagata University, Yonezawa, Yamagata 992-0038, Japan
cInstitute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
Received 27 August 1998; received in revised form 23 October 1998; accepted 10 December 1998
Abstract
Time-resolved small-angle X-ray scattering (SAXS) measurement was carried out to trace the structural change of polyethylene (PE) during the isothermal crystallization from the melt. All kinds of PE samples of high-density PE, linear low-density PE, and deuterated highdensity PE were found to show essentially the same SAXS pattern changes, although the crystallization rates were different among them. The thus obtained SAXS data were combined with the previously reported FTIR data [Tashiro K., Sasaki S., Kobayashi M., Polym J, 1998;30:485] and could be interpreted quantitatively by dividing into the following three time regions: (1) immediately after the sample was cooled to the crystallization temperature, the density ?uctuation in the molten state increased, resulting in the generation of the conformationally disordered short trans segments. (2) The disordered trans segments experienced the conformational ordering to the orthorhombic-type trans-zigzag form. These regular chain segments were aggregated to form a crystalline lamella of ca. 50 A? thickness. This separation of the system into the high (lamella) and low density (amorphous) regions occurred with ca. 800 A? period. (3) These isolated
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