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NMR relaxation reveals modifications in rubber phase dynamics during long-term degradation of high-impact polystyrene (HIPS)
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0003-3572-7798
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0002-5394-7850
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2011 (English)In: Polymer, ISSN 0032-3861, E-ISSN 1873-2291, Vol. 52, no 6, 1410-1416 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2011. Vol. 52, no 6, 1410-1416 p.
Keyword [en]
High-impact polystyrene (HIPS), Nuclear magnetic resonance relaxation, Polybutadiene rubber
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-32599DOI: 10.1016/j.polymer.2011.02.005ISI: 000288734500008ScopusID: 2-s2.0-79952364321OAI: diva2:412070
QC 20110420Available from: 2011-04-20 Created: 2011-04-18 Last updated: 2011-04-20Bibliographically approved

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Vilaplana, FranciscoKarlsson, Sigbritt
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