ISSN:
0887-624X
Schlagwort(e):
poly(arylene ether)s
;
poly(N-arylene benzimidazole)s
;
high-temperature polymers
;
high-performance polymers
;
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
Poly(arylene ether)s containing N-arylenebenzimidazole groups were prepared by the aromatic nucleophilic displacement reaction of two new bis(hydroxyphenyl-N-arylenebenzimidazole)s with activated aromatic difluorides in sulfolane at 200°C in the presence of anhydrous potassium carbonate. The bis(hydroxyphenyl-N-arylenebenzimidazole)s were prepared from bis(o-aminoanilino) arylenes and phenyl-4-hydroxybenzoate. The polymers were soluble in N-methyl-2-pyrrolidinone and m-cresol and exhibited inherent viscosities from 0.37-0.86 dL/g and glass transition temperatures from 219-289°C. Thermogravimetric analyses showed 5% weight losses from 463-506°C in air and 467-522°C in nitrogen. Unoriented thin films exhibited tensile strengths, moduli, and break elongations at 23°C of 10.2-12.5 ksi, 318-365 ksi, and 4-7%, respectively, and at 177°C of 5.1-6.9 ksi, 256-296 ksi, and 1-5%, respectively. A 50 : 50 random copolymer prepared from 1,3-bis(4-fluorobenzoyl) benzene, 1,1'-(4,4'-biphenylene)-bis[2-(4-hydroxyphenyl)benzimidazole], and 5,5'-bis[2-(4-hydroxyphenyl)benzimidazole] exhibited higher moisture absorption and lower tensile properties than those predicted by a rule of mixtures relationship. The chemical, physical, and mechanical properties of these polymers are discussed. © 1993 John Wiley & Sons, Inc.
Zusätzliches Material:
6 Tab.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/pola.1993.080311226
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