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Degradation of poly(ethylene terephthalate)/clay nanocomposites during melt extrusion: Effect of clay catalysis and chain extension
Xu, Xinfeng; Ding, Yanfen; Qian, Zhongzhong; Wang, Feng; Wen, Bin; Zhou, Hu; Zhang, Shimin; Yang, Mingshu
2009
Source PublicationPOLYMER DEGRADATION AND STABILITY
ISSN0141-3910
Volume94Issue:1Pages:113-123
AbstractOrganoclays with various contents of hydroxyl groups and absorbed ammonium were prepared and compounded with poly(ethylene terephthalate) (PET), forming PET/clay nanocomposites via melt extrusion. Dilute solution viscosity techniques were used to evaluate the level of molecular weight of PET/clay nanocomposites. Actually, a significant reduction in PET molecular weight was observed. The level of degradation depended on both the clay structure and surfactant chemistry in organoclays. The composites, based on clay with larger amount of hydroxyl groups on the edge of clay platelets, experienced much more degradation, because the hydroxyl groups acted as Breasted acidic sites to accelerate polymer degradation. Furthermore, organoclays with different amounts of absorbed ammonium led to different extents of polymerdegradation, depending upon the acidic sites produced by the Hofmann elimination reaction of ammonium. In addition, the composite with better clay dispersion state, which was considered as an increasing amount of clay surface and ammonium exposed to the PET matrix, experienced polymer degradation more seriously. To compensate for polymer degradation during melt extrusion, pyromellitic dianhydride (PMDA) was used as chain extender to increase the intrinsic viscosity of polymer matrix; more importantly, the addition of PMDA had little influence on the clay exfoliation state in PET/clay nanocomposites. (C) 2008 Elsevier Ltd. All rights reserved.
KeywordPoly(Ethylene Terephthalate) Clay Nanocomposites Thermal Degradation Chain Extension
DOI10.1016/j.polymdegradstab.2008.09.009
Indexed BySCI
Language英语
WOS IDWOS:000262954800017
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:93[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/68086
Collection中国科学院化学研究所
Corresponding AuthorYang, Mingshu
AffiliationChinese Acad Sci, Inst Chem, Key Lab Engn Phys, Beijing Normal Lab Mol Sci, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Xu, Xinfeng,Ding, Yanfen,Qian, Zhongzhong,et al. Degradation of poly(ethylene terephthalate)/clay nanocomposites during melt extrusion: Effect of clay catalysis and chain extension[J]. POLYMER DEGRADATION AND STABILITY,2009,94(1):113-123.
APA Xu, Xinfeng.,Ding, Yanfen.,Qian, Zhongzhong.,Wang, Feng.,Wen, Bin.,...&Yang, Mingshu.(2009).Degradation of poly(ethylene terephthalate)/clay nanocomposites during melt extrusion: Effect of clay catalysis and chain extension.POLYMER DEGRADATION AND STABILITY,94(1),113-123.
MLA Xu, Xinfeng,et al."Degradation of poly(ethylene terephthalate)/clay nanocomposites during melt extrusion: Effect of clay catalysis and chain extension".POLYMER DEGRADATION AND STABILITY 94.1(2009):113-123.
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