ISSN:
0449-2951
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Treatment of benzyl chloride with iron powder in water suspension results in the formation of benzyl radicals, which are subsequently dimerized into bibenzyl. This reaction has now been extended to p-xylylene dibromide under a set of conditions as summarized in Table I. High yields (70-80%) of poly-p-xylylene, which was identified by infrared spectrum, x-ray diffraction pattern, and other properties, were obtained with reduced iron suspended in a mixture of xylene and water (50:50) or in dimethylformamide. Zinc powder coated with nickel (Urushibara nickel CB) gave comparable yields of poly-p-xylylene, while cobalt powder or zinc - cobalt couple afforded inferior yields. Similar reaction of o- and m-xylylene dibromides gave soluble polymers. The presence of o-xylylene as an unstable intermediate of the polymerization of o-xylylene dibromide has been indicated by trapping this transitory hydrocarbon with acrylonitrile and with methyl acrylate as diene adducts.
Additional Material:
1 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1963.100010628
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