Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/71139
標題: Poly(trimethylene teraphthalate) crystal structure and morphology in different length scales
作者: Wang, B.J.
Li, C.Y.
Hanzlicek, J.
Cheng, S.Z.D.
Geil, P.H.
Grebowicz, J.
Ho, R.M.
關鍵字: wide angle X-ray diffraction
poly(trimethylene teraphthalate)
morphology
polyethylene single-crystals
spherulitic morphology
crystallization
terephthalate)
melt
transition
polymers
polypropylene
organization
orientation
期刊/報告no:: Polymer, Volume 42, Issue 16, Page(s) 7171-7180.
摘要: Poly(trimethlene teraphthalate) (PTT) is one of the terephthalic polyester family members which can crystallize between its glass transition and melting temperatures. The crystal structure has been determined using both electron diffraction (ED) on single crystals and wide angle X-ray diffraction on powder and oriented fibers. The unit cell is triclinic with dimensions of a = 0.46 (3) nm, b = 0.61 (2) nm, c = 1.86 (1) nm, alpha = 97.5 degrees, beta = 92.1 degrees, and gamma = 110 degrees. The bulk PTT samples usually crystallize to form spherulites in the crystallization temperature (T-c) region studied. Between T-c = 135 and 165 degreesC, the spherulites show a banded texture, and the band spacing increases with increasing T-c. The radial direction in the spherulites has been determined to be the crystal a-axis. Observations of successive ED patterns taken along the radial direction of a spherulite within one band reveal twist of lamellar crystals along the spherulite radial direction. The chain-folding direction, determined using a polyethylene decoration method, is along the a-axis direction in the lamellar crystals and parallel to the radial direction in the spherulites. Linear growth rates of the spherulites have also been measured and the maximum growth temperature is located at 165 degreesC. This temperature is also the upper-limit temperature for PTT banded texture spherulite formation. (C) 2001 Elsevier Science Ltd. All rights reserved.
URI: http://hdl.handle.net/11455/71139
ISSN: 0032-3861
文章連結: http://dx.doi.org/10.1016/s0032-3861(01)00046-5
Appears in Collections:期刊論文

文件中的檔案:

取得全文請前往華藝線上圖書館



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.