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Thermal stability of PVC/chlororubber‐20‐graft polyblend–styrene–acrylonitrile blends. I
Author(s) -
Singh Y. P.,
Singh R. P.
Publication year - 1984
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1984.070290423
Subject(s) - miscibility , materials science , acrylonitrile , thermal stability , polymer blend , polyvinyl chloride , degradation (telecommunications) , isothermal process , thermogravimetry , composite material , styrene , polymer chemistry , chemical engineering , copolymer , polymer , telecommunications , physics , computer science , engineering , thermodynamics
Thermal stability of PVC blends with chlororubber‐20‐graft polyblend‐styrene‐acrylonitrile [CR‐20gp‐SAN (2:1)] was studied by HCI evolution techniques and thermogravimetry under isothermal condition. The thermal stability of PVC/CR‐20gp‐SAN (2:1) blends has been compared with those of PVC/CR‐20 and PVC/KM‐365B blends. It has been observed that the thermal stability of modified PVC is less than that of unmodified PVC. The CR‐20gp‐SAN (2:1) modified PVC blends were found to be more stable than PVC/CR‐20 blends but less stable than PVC/KM‐365B blends. The rate of degradation in PVC blends were observed to be unaffected by the concentration of the modifiers, but the PVC/KM‐365B blends were found to be degrading slower in comparison with PVC/CR‐20 and PVC/CR‐20gp‐SAN (2:1) blends. The rate of degradation for PVC/CR‐20 blends at lower concentrations (<10%) of modifiers is almost equal to that of PVC/CR‐20‐gp‐SAN (2:1) blends, but more at higher concentrations of modifiers (>10%). The experimental results have been explained on the basis of the chemical nature of the modifiers and their miscibility with PVC.