Abstract - Molecular conformation, dynamics, and chemical shipt anisotropy of high impact polystyrene: Temperature dependence and stress dependence studies


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	Publications of MRB Latest Publications MRB Digest Journal of Rubber Research 3^rd Qtr 2008 Vol 11(3) 2^nd Qtr 2008 Vol 11(2) 1^st Qtr 2008 Vol 11(1) 4^th Qtr 2007 Vol 10(4) 3^rd Qtr 2007 Vol 10(3) 2^nd Qtr 2007 Vol 10(2) 1^st Qtr 2007 Vol 10(1) 1^st Qtr 2006 Vol 9(1) 2^nd Qtr 2006 Vol 9(2) 3^rd Qtr 2006 Vol 9(3) 4^th Qtr 2006 Vol 9(4) Submit paper/article Order Form	Abstract Molecular Conformation, Dynamics, and Chemical Shipt Anisotropy of High Impact Polystyrene: Temperature Dependence and Stress Dependence Studies Variable temperature and variable stress nuclear magnetic resonance spectroscopic and imaging studies are reported for a commercial sample of high impact polystyrene. ‘Liquid’ nuclear magnetic resonance microscopy and ‘solid’ state stray field imaging studies indicated that imposed stress affects the molecular chain dynamics only of the polybutadiene region and not of the polystyrene (PS) matrix. The molecular chain dynamics of the components of the composite were further studied by variable temperature relaxation time and chemical shift anisotropy (CSA) measurements. The variable temperature (30°C - 210°C) ¹H spin-lattice relaxation time in the rotating frame (T_1pH) studies showed that up to 160°C the PS undergoes at least 2 different modes of motion, while at 95°C a change from asymmertric to axially symmetric in the CSA pattern of the aromatic ring ₁₃C-{¹H} resonances revealed that the conformations of the phenyl rings are effectively locked below that temperature.
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