ISSN:
0449-2951
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The polymerization of 3,3′-dihydroxybenzidine with the phenyl esters of phthalic, isophthalic, terephthalic, and 5-chloroisophthalic acids yielded a series of aromatic polybenzoxazoles exhibiting high thermal stability. Melt polymerization afforded these polymers in quantitative yield with inherent viscosities in the range of 0.20-1.04 and thermal stability very similar to those obtained with the aromatic polybenzimidazoles. Homopolymerization of 3-amino-4-hydroxybenzoic acid and 4-amino-3-hydroxybenzoic acid was achieved through the preparation of an intermediate poly(ester-amide) followed by thermal cyclization (at 250-300°C.) to the benzoxazole unit. Six model compounds containing the benzoxazole unit were prepared for use as standards of reference. These were 2-phenylbenzoxazole, 2,2′-p-phenylene-bisbenzoxazole, 2,2′-m-phenylene-bisbenzoxazole, 2,2′-o-phenylene-bisbenzoxazole, 2,2′-(5-chloro-1,2-phenylene)-bisbenzoxazole, and 2,2′-(diphenyl)-6,6′-bibenzoxazole.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1965.100030603
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