Thermogravimetric analysis of PVC/ELNR blends

The thermal behaviour of a series of solution-cast blends of polyvinyl chloride/epoxidised liquid natural rubber (ELNR) of different mole percentage of epoxidation has been examined using thermogravimetric analysis. Thermal degradation is found to occur through a two-step route in which the first st...

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Bibliographic Details
Published in:Polymer degradation and stability 2007-02, Vol.92 (2), p.189-196
Main Authors: Radhakrishnan Nair, M.N., Thomas, George V., Gopinathan Nair, M.R.
Format: Article
Language:English
Subjects:
Activation energy
Applied sciences
Chemical reactions and properties
Degradation
Degradation kinetics
ELNR
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymer blends
PVC
Thermogravimetry
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Summary:The thermal behaviour of a series of solution-cast blends of polyvinyl chloride/epoxidised liquid natural rubber (ELNR) of different mole percentage of epoxidation has been examined using thermogravimetric analysis. Thermal degradation is found to occur through a two-step route in which the first step corresponds to the dehydrochlorination of PVC to form a polyene and the second step is attributed to the decomposition of the ELNR and the polyene. Introduction of 20 and 50 mol% of epoxy group into the liquid NR is found to enhance the thermal stability of PVC. Probable mechanisms of degradation have been suggested on the basis of the kinetic analysis of the degradation studies. It is found that the mechanism is influenced by the epoxy content of the blend system. Activation energy for the degradation and the entropy change have also been reported.
ISSN:0141-3910
1873-2321
DOI:10.1016/j.polymdegradstab.2006.11.014