ISSN:
0022-3832
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Proton magnetic resonance of a number of polyamides has been investigated in the 80-410°K. range. Line width and second moment vs. temperature plots for dry specimens of poly(hexamethylene adipamide) and poly(hexamethylene sebacamide) are found to exhibit two transition regions. Saturation with H2O or D2O lowers the temperature of the principal line-narrowing process for the above two polymers as well as for poly(decamethylene sebacamide) and shifts part of the second-moment transition which occurs above room temperature to lower temperatures; in both cases H2O has a more pronounced effect than D2O. Exchange of the protons, presumably on the amide groups, for deuterium leads to small decreases in line width and second moment at temperature in and below the main transition. N-methylation of poly(decamethylene sebacamide) up to 58% causes marked shifts of the principal line-narrowing process and NMR second moment transition to lower temperatures. The NMR data are found to be in qualitative agreement with dynamic mechanical measurements on similar samples.
Additional Material:
8 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1960.1204514607
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