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Liquid chlorine as chlorinating agent for preparation of chlorinated natural and synthetic rubbers
Author(s) -
Cataldo Franco
Publication year - 1995
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/app.1995.070581118
Subject(s) - chlorine , natural rubber , polybutadiene , solvent , chemistry , synthetic rubber , carbon tetrachloride , organic chemistry , chemical engineering , polymer chemistry , copolymer , polymer , engineering
Abstract In order to overcome the use of solvents like carbon tetrachloride (during the industrial preparation of chlorinated natural rubber or chlorowaxes) which are suspected of damaging the layer of atmospheric ozone, I proposed the use of liquid Cl 2 as both chlorinating agent and solvent. It is shown that natural rubber or synthetic cis‐1,4‐polyisoprene can be swelled by liquid chlorine at −40°C. By equilibrating to room temperature, the rubber is chlorinated by the expansion of the chlorine trapped in the rubber granules in a process resembling popcorn formation. Chlorine uptake was found to be 56.5% and the chlorinated rubber obtained was studied by FT‐IR spectroscopy. Cis‐1,4‐polybutadiene, when chlorinated with liquid chlorine, gives a hard insoluble product with chlorine content of 36%. © 1995 John Wiley & Sons, Inc.