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Digitale Medien

Phenylene motion in polycarbonate: Influence of tensile stress and chemical modification (1993)

Hansen, M. T. ; Boeffel, C. ; Spiess, H. W.

Springer

Colloid & polymer science 271 (1993), S. 446-453

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Details

ISSN: 1435-1536

Schlagwort(e): Polycarbonates ; molecular motions ; 2H NMR ; tensile stress

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie , Maschinenbau

Notizen: Abstract Deuteron NMR was utilized to study phenylene group motions in glassy polycarbonate (PC) as a function of tensile stress and chemical modification. A special stretching device was constructed allowing the application of forces up to 1500 N during the measurement. While cold drawing of PC effects motional restrictions equivalent to a temperature shift of 10 K, a reversible strain near the yield point enhances the ring dynamics slightly. Methyl group substitution at the ortho positions gives rise to even more constraints, shifting the onset of fast ring flips by about 180 K.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00657388

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