ISSN:
0449-2951
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Five new high molecular weight polyquinoxalines have been prepared by the reactions of combinations of two tetramines, 3,3′-diaminobenzidine (II) and 3,3′,4,4′-tetraminodiphenyl ether (IV), with the three bisglyoxals, 1,4-phenylenediglyoxal (I), 1,3-phenylenediglyoxal (VI), and 4,4′-oxydiphenylenediglyoxal (IX). Solution and melt polymerization techniques afford intermediate molecular weight polymers which can be converted to high molecular weight samples (ηinh 〉 1.0) by heating at 375°C. under reduced pressure. All the polyquinoxalines have excellent thermal stability both in nitrogen and in air. Of these polymers, poly[2,2′-(4,4′-oxydiphenylene)-6,6′-oxydiquinoxaline] (XI) has the highest solubility in hexamethylphosphoramide (HMP), and films can be cast from intermediate molecular weight (ηinh = 0.3-0.7) polymer solutions in HMP. Tough, insoluble films can be obtained by heating the cast films in nitrogen or under reduced pressure to 350-400°C.
Additional Material:
8 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1965.100030314
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