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Conversion distribution in diffusion‐governed chlorination of poly(vinyl chloride)
Author(s) -
Wachi Shun,
Morikawa Hisashi,
Inoue Hakuai
Publication year - 1988
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690341012
Subject(s) - vinyl chloride , chlorinated polyvinyl chloride , chlorine , diffusion , polymer chemistry , sorption , chemistry , chloride , polymerization , gravimetric analysis , polymer , chemical engineering , materials science , polyvinyl chloride , thermodynamics , organic chemistry , physics , adsorption , engineering , copolymer
Conversion distribution in particles of chlorinated poly(vinyl chloride) (CPVC) is conceptually described based on balance equations involving mass transfer and chemical reaction. In the physical sorption of chlorine in poly(vinyl chloride) (PVC) as measured by the constant volume cell method, equilibrium concentration and diffusion rate obeyed Henry's law and Fick's law. The rate process of photo chlorination of PVC, which was investigated by the gravimetric method, could be well predicted by theoretical calculation of chlorine diffusion in PVC accompanying the infinitely fast chemical reaction. In a free grain of PVC synthesized by suspension polymerization, the chlorination rate was governed by the polymer‐phase diffusion within agglomerates of coalesced primary particles. To produce homogeneously chlorinated PVC, a periodic photo‐irradiation method was theoretically proposed and experimentally demonstrated. The effect of the periodic operation on the thermal property of CPVC was evaluated by DSC.