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Thermal gelation of poly(vinyl chloride)
Author(s) -
Basan Satilmis̨,
Karadağ Erdener
Publication year - 1995
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1995.210380111
Subject(s) - isothermal process , vinyl chloride , molar mass , materials science , polyvinyl chloride , polymer chemistry , viscosity , thermal , chemical engineering , composite material , thermodynamics , polymer , copolymer , physics , engineering
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 (M̄ v = 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.