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FTIR studies of molecular disorder in long chain n‐alkanes: chain tilt and chain end disorder
Author(s) -
de Silva D.S.M.,
Gorce J.P.,
Wickramarachchi P.A.S.R.,
Spells S.J.
Publication year - 2002
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200208)184:1<67::aid-masy67>3.0.co;2-z
Subject(s) - chain (unit) , tilt (camera) , long chain , fourier transform infrared spectroscopy , materials science , chemical engineering , polymer science , physics , engineering , mechanical engineering , astronomy
Successive heat annealing and cooling of the extended chain form of C 198 H 398 leads to a “perfecting” of the chains, on the evidence of FTIR data. A similar sample of CD 3 (CD 2 ) 11 (CH 2 ) 192 (CD 2 ) 11 CD 3 allows the deuterated end segments to be analysed separately. It is shown that the end segments develop better register, while the chain interior is scarcely affected by annealing. The alignment of chain ends coincides with the development of chain tilt (from SAXS data), the tilt angle increasing as the chain ends become more “defect‐free” to a figure close to the maximum values obtained for polyethylene.