ISSN:
1022-1352
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The orientational distribution in drawn amorphous poly(methyl methacrylate) extended to the ratio λ = 3 was measured with one- and two-dimensional carbon-13 NMR spectroscopy. In the analysis, signals from the carboxyl carbons were used as a probe of the orientational distribution. The angular-dependent line shapes were analyzed to determine the orientational distribution function and the order parameter 〈P2〉. The analysis yielded 〈P2〉 = 0,21. A two-dimensional rotor-synchronized magic angle spinning experiment was also used to measure the order parameter. The obtained value 〈P2〉 = 0,22 is in excellent agreement with the 1D result. The experimental results obtained for 〈P2〉 are compared to those proposed by the pseudo-affine model. 〈P2〉 predicted by theory is reduced due to conformational disorder present in the glassy state.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1994.021950525
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