کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5189409 | 1381184 | 2006 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Crystal and molecular structure of the thioether-analogue of PEEK from X-ray powder data and diffraction-modelling
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
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چکیده انگلیسی
Analysis of X-ray powder data for the melt-crystallisable aromatic poly(thioether thioether ketone) [-S-Ar-S-Ar-CO-Ar]n, ('PTTK', Ar=1,4-phenylene), reveals that it adopts a crystal structure very different from that established for its ether-analogue PEEK. Molecular modelling and diffraction-simulation studies of PTTK show that the structure of this polymer is analogous to that of melt-crystallised poly(thioetherketone) [-S-Ar-CO-Ar]n in which the carbonyl linkages in symmetry-related chains are aligned anti-parallel to one another, and that these bridging units are crystallographically interchangeable. The final model for the crystal structure of PTTK is thus disordered, in the monoclinic space group I2/a (two chains per unit cell), with cell dimensions a=7.83, b=6.06, c=10.35Â Ã
, β=93.47°.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 47, Issue 2, 13 January 2006, Pages 585-590
Journal: Polymer - Volume 47, Issue 2, 13 January 2006, Pages 585-590
نویسندگان
Howard M. Colquhoun, Peter L. Aldred, Allan S. Hay, Antisar Rih Hlil, Kenji Miyatake, David J. Williams,