DETERMINATION OF THERMAL GELATION POINTS OF A VINYLIDENE-CHLORIDE ACRYLONITRILE COPOLYMER BY A SPECTROPHOTOMETRIC TECHNIQUE


BASAN S.

POLYMER DEGRADATION AND STABILITY, vol.33, no.3, pp.429-440, 1991 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 33 Issue: 3
  • Publication Date: 1991
  • Doi Number: 10.1016/0141-3910(91)90087-8
  • Title of Journal : POLYMER DEGRADATION AND STABILITY
  • Page Numbers: pp.429-440

Abstract

In this study, the thermal gelation points of a vinylidene chloride/acrylonitrile random copolymer have been determined using a spectrophotometric technique. In the first part, the thermal gelation temperature and the thermal gelation weight loss have been determined as 219-degrees-C and 4.6%, respectively. In the second part, isothermal gelation times at 150, 160, 170 and 180-degrees-C have been determined as 256, 105, 44 and 27 min, respectively. At these temperatures the isothermal gelation weight losses have been found to be 0.37, 0.68, 0.92 and 1.26%, respectively. In conclusion, it has been shown that the crosslinking reaction in vinylidene chloride/acrylonitrile copolymer begins at lower temperatures and weight losses in isothermal heating than in dynamic heating.