PHENYLENE MOTION IN POLYCARBONATE - INFLUENCE OF TENSILE-STRESS AND CHEMICAL MODIFICATION

Citation
Mt. Hansen et al., PHENYLENE MOTION IN POLYCARBONATE - INFLUENCE OF TENSILE-STRESS AND CHEMICAL MODIFICATION, Colloid and polymer science, 271(5), 1993, pp. 446-453
Citations number
27
Categorie Soggetti
Polymer Sciences
Journal title
ISSN journal
0303402X
Volume
271
Issue
5
Year of publication
1993
Pages
446 - 453
Database
ISI
SICI code
0303-402X(1993)271:5<446:PMIP-I>2.0.ZU;2-X
Abstract
Deuteron NMR was utilized to study phenylene group motions in glassy p olycarbonate (PC) as a function of tensile stress and chemical modific ation. A special stretching device was constructed allowing the applic ation of forces up to 1500 N during the measurement. While cold drawin g of PC effects motional restrictions equivalent to a temperature shif t of 10 K, a reversible strain near the yield point enhances the ring dynamics slightly. Methyl group substitution at the ortho positions gi ves rise to even more constraints, shifting the onset of fast ring fli ps by about 180 K.