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Simultaneous crystallization and decomposition of PVA/MMT composites during non-isothermal process
journal contribution
posted on 2015-10-20, 00:00 authored by Chengpeng Li, Tingting Hou, Jitraporn Vongsvivut, Yongzhen Li, Xiaodong She, Fenghua She, Weimin Gao, Lingxue KongLingxue KongDecomposition of poly(vinyl alcohol)/montmorillonite clay (PVA/MMT) composites during melting-crystallization was experimentally confirmed by morphology and molecular structure changes. In particular, FTIR spectra show the shift of O-H stretching band as well as enhanced intensities of C-O stretching and CH2 rocking vibrational modes. Furthermore, Raman deconvolution indicates that C-H wagging, CH2-CH wagging, CH-CO bending and CH2 wagging modes in amorphous domains were all decreased greatly. Moreover, this decomposition leads to decreased melting enthalpy, melting point, crystallization enthalpy and crystallization temperature. Crystallization analysis shows that the MMT incorporated slows down the crystallization process in the PVA matrix regardless of the nucleation capability of MMT. Despite the severe decomposition, the crystallization kinetics still corroborated well with common classical models. As a result, molecular structure changes and crystallization retardation observed in this study clearly indicate the strong effects of the thermal degradation on the non-isothermal crystallization of PVA/MMT composites.
History
Journal
Thermochimica actaVolume
618Pagination
26 - 35Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0040-6031Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2015, ElsevierUsage metrics
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