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Orientational distribution in stretched poly(methyl methacrylate) from 13 C NMR spectroscopy
Author(s) -
Kulik Andrzej S.,
Spiess Hans Wolfgang
Publication year - 1994
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1994.021950525
Subject(s) - spectroscopy , nuclear magnetic resonance spectroscopy , magic angle spinning , amorphous solid , poly(methyl methacrylate) , methyl methacrylate , methacrylate , chemistry , analytical chemistry (journal) , materials science , magic angle , polymer chemistry , crystallography , polymer , physics , stereochemistry , polymerization , organic chemistry , quantum mechanics
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 〈 P 2 〉. The analysis yielded 〈 P 2 〉 = 0,21. A two‐dimensional rotor‐synchronized magic angle spinning experiment was also used to measure the order parameter. The obtained value 〈 P 2 〉 = 0,22 is in excellent agreement with the 1D result. The experimental results obtained for 〈 P 2 〉 are compared to those proposed by the pseudo‐affine model. 〈 P 2 〉 predicted by theory is reduced due to conformational disorder present in the glassy state.