Journal
POLYMER
Volume 52, Issue 6, Pages 1410-1416Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2011.02.005
Keywords
High-impact polystyrene (HIPS); Nuclear magnetic resonance relaxation; Polybutadiene rubber
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Funding
- Spanish Ministry of Science and Innovation through the FPU
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The microstructure of rubber-modified polystyrene after thermal ageing at 90 C and multiple extrusion was analyzed by time-domain nuclear magnetic resonance (TD-NMR) in a non-destructive manner. The transverse magnetization decay behaviour observed in TD-NMR was related to the total rubber fraction and its cross-linking density. The data reveal different mechanisms of long-term rubber degradation in high-impact polystyrene (HIPS) during then-no-oxidation and multiple processing: Multiple processing causes a slight increase in the cross-linking density of the rubber phase, without appreciably altering the total amount of rubber fraction. Thermo-oxidation is accompanied by a significant overall decrease of the rubber fraction, an increase of the cross-linking density, and a pronounced increase of the non-crosslinked fraction (chain ends and fragmented segments). The NMR results correlate well with spectroscopic observations and moderately with macroscopic mechanical properties. (C) 2011 Elsevier Ltd. All rights reserved.
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