Chain mobility of some terephthalic acid polyesters in solution. A13C spin‐relaxation study
作者:
Richard A. Komoroski,
期刊:
Journal of Polymer Science: Polymer Physics Edition
(WILEY Available online 1979)
卷期:
Volume 17,
issue 1
页码: 45-53
ISSN:0098-1273
年代: 1979
DOI:10.1002/pol.1979.180170103
出版商: John Wiley&Sons, Inc.
数据来源: WILEY
摘要:
AbstractCarbon‐13 spin‐lattice relaxation times (T1), nuclear Overhauser enhancements (NOE), and resonance linewidths (Δp) have been measured for a series of terephthalic acid polyesters containing ethyl, butyl, hexyl, and isopropyl groups between neighboring terephthalate units. The relaxation parameters of all carbons in the terephthalate groups are independent of the length of the separating alkyl chain. Reduced NOE's are seen for all carbons. The data are interpreted in terms of a log X2distribution of correlation times of constant width, but variable average mobility. The average mobility in the alkyl chain increases with increasing distance from the terephthalate group in a given polymer. For a given position in the chain. mobility increases with increasing chain length. This behavior is consistent with the presence of independently reorienting, highly solvated terephthalate gr
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