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Studies on miscibility of poly(vinyl chloride) with natural rubber‐ graft ‐polyacrylonitrile and natural rubber‐ graft ‐poly(methyl methacrylate)
Author(s) -
Okieimen F. E.,
Urhoghide I. N.
Publication year - 1996
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/(sici)1097-4628(19960314)59:11<1803::aid-app17>3.0.co;2-u
Subject(s) - miscibility , vinyl chloride , materials science , polyvinyl chloride , differential scanning calorimetry , polymer chemistry , methyl methacrylate , natural rubber , polyacrylonitrile , endotherm , polymer blend , poly(methyl methacrylate) , composite material , copolymer , polymer , thermodynamics , physics
The miscibility of poly(vinyl chloride)/natural rubber‐ graft ‐polyacrylonitrile (PVC/NRPACN) and PVC/NR‐ graft ‐poly(methyl methacrylate) (PMMA) were studied by differential scanning calorimetry (DSC) and viscometry. DSC curves of PVC/NR graft copolymer blends showed a major endotherm at about 265°C that was assigned to the thermal decomposition of PVC. PVC/NRPMMA blends showed a minor endothermic peak at about 124°C and the PVC/NRPACN blends showed a broad peak (which develops into two peaks) at about 160°–180°C, respectively. Absolute viscosity versus weight percent PVC plots of the two sets of blends were nonlinear. X‐ray diffraction patterns of the PVC/NRPACN blends showed overlapping spacings due to the constituent polymers. Phase‐contrast micrographs of the PVC/NRPACN blends showed gross phase discontinuity. The heats of mixing solutions of PVC blended with NRPMMA were found to be well above the upper limit of miscibility. © 1996 John Wiley & Sons, Inc.