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Multidimensional benzobisoxazole rigid-rod polymers. I. Preparation and characterization

✍ Scribed by M. Dotrong; M. H. Dotrong; R. C. Evers

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
135 KB
Volume
35
Category
Article
ISSN
0887-624X

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✦ Synopsis

Two-and three-dimensional rigid-rod polymers containing benzobisoxazole structures were prepared through the polycondensation in polyphosphoric acid of 4-[5amino-6-hydroxybenzoxazol-2-yl]benzoic acid (ABA) with trimesic acid and 1,3,5,7tetrakis(4-carboxylatophenyl)adamantane, respectively. Thermal properties of the polymers were determined by differential scanning calorimetry, thermogravimetric/ mass spectral analysis, and isothermal aging studies. The multidimensional polymers exhibited lower solution viscosities and lower thermooxidative stabilities than the onedimensional polymer generated by the homopolymerization of ABA under identical reaction conditions.

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## SYNOPSJS Copolymerization of 4-vinylpyridine (4VP) with styrene (St) was performed in ethanol using 2,2'-azobisisobutyronitrile (AIBN) as an initiator, and then a random copolymer P(4VP-St) was obtained. A soluble pyridinium-type polymer containing N-benzyl-4-vinylpyridinium bromide [Q-P(4VP-St)