ISSN:
0022-3832
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Polyvinyl chloride was condensed with a series of aromatic compounds (benzene, toluene, m-xylene, pseudocumene, and mesitylene) in the presence of aluminum chloride. These condensation reactions were carried out in several reaction media, in heterogeneous or semihomogeneous systems. The catalyst concentration exercises a determining effect on the over-all rate of the reaction. The degree of substitution of the polymers obtained was evaluated by chemical determination of the residual chlorine content. The condensation proceeds through a two-step reaction scheme: an alkylation reaction of the aromatic ring, according to the classical orientation rules (except for pseudocumene and mesitylene), followed by a fast intramolecular cyclization reaction yielding 1,3-methyleneindan units. Nevertheless some “abnormal” substituted products were also detected in the end products. The structure of these polymers determined from their infrared absorption spectra by comparison with the spectra of the following reference compounds: polystyrene, poly-m-methyl- and poly-p-methylstyrenes, poly-2,4-dimethyl- and poly-3,5-dimethylstyrenes, poly-2,4,6-trimethylstyrene, 1,3-dimethyl-, 1,3,6-trimethyl-, and 1,1,3,3,4,6-hexamethylindans. The condensation reactions of this type are always accompained by a strong decrease of the degree of polymerization, which was followed by both viscometric and osmotic measurements; this decrease of the degree of polymerization depends mostly on the amount of aromatic substitution on the polymers.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1956.120209510
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