Thermal gelation of poly(vinyl chloride)

The dynamic and isothermal gelation points of poly(vinyl chloride) (PVC) were determined using spectrophotometric and viscometric techniques. Four different PVC samples, with viscosity‐average molar masses of 70 000, 90 000, 106 000 and 141 000, were used. The dynamic thermal gelation points of PVC...

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Bibliographic Details
Published in:Polymer international 1995-09, Vol.38 (1), p.83-87
Main Authors: Basan, Satilmis̨, Karadağ, Erdener
Format: Article
Language:English
Subjects:
Applied sciences
Chemical reactions and properties
crosslinking
Crosslinking, vulcanization
dynamic gelation
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
poly(vinyl chloride)
spectrophotometry
thermal gelation
viscometry
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Summary:The dynamic and isothermal gelation points of poly(vinyl chloride) (PVC) were determined using spectrophotometric and viscometric techniques. Four different PVC samples, with viscosity‐average molar masses of 70 000, 90 000, 106 000 and 141 000, were used. The dynamic thermal gelation points of PVC samples heated to temperatures between 120 and 280°C were found to be between 232 and 236°C. Isothermal gelation times of PVC (M̄v = 106 000) heated at 170, 180, 190 and 200°C were determined as 345, 177, 78 and 37 min., respectively. An inverse relationship between the tendency to dynamic and isothermal gelation with increase in molar mass of PVC samples was found. On the other hand, the tendency to isothermal gelation of PVC increases with raising temperature.
ISSN:0959-8103
1097-0126
DOI:10.1002/pi.1995.210380111