The effects of clay on the thermal degradation behavior of poly(styrene- co-acrylonitirile)
The thermal degradation of poly(acrylonitrile- co-styrene) (SAN) and its clay nanocomposites were studied using TGA/FTIR and GC/MS. Virgin SAN degrades by chain scission followed by β-scission, producing monomers, dimers and trimers. The degradation pathway of SAN in clay nanocomposites contains add...
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Published in | Polymer (Guilford) Vol. 46; no. 23; pp. 9702 - 9713 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Oxford
Elsevier Ltd
14.11.2005
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | The thermal degradation of poly(acrylonitrile-
co-styrene) (SAN) and its clay nanocomposites were studied using TGA/FTIR and GC/MS. Virgin SAN degrades by chain scission followed by β-scission, producing monomers, dimers and trimers. The degradation pathway of SAN in clay nanocomposites contains additional steps; extensive random chain scission, evolving additional compounds having an odd number of carbons in the chain backbones, and radical recombination, producing head-to-head structures. Since acrylonitrile-butadiene-styrene copolymer (ABS) has butadiene rubber incorporated as a grafted phase in a SAN matrix, ABS follows a similar degradation pathway as that of SAN. The effect of butadiene rubber is similar to that of clay, leading to extensive random scission and an increase in thermal stability, but as not effective as clay due to its shorter duration. Eventually, the butadiene rubber phase degrades to small aliphatic molecules. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0032-3861 1873-2291 |
DOI: | 10.1016/j.polymer.2005.07.078 |