Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2011-09-01

Journal: EUROPEAN POLYMER JOURNAL

Included Journals: EI、SCIE、Scopus

Volume: 47

Issue: 9

Page Number: 1852-1860

ISSN: 0014-3057

Key Words: Polybenzimidazole; 4-Phenyl phthalazinone; Solubility; Thermal property

Abstract: A novel series of homo- and copoly(phthalazinone benzimidazole)s were synthesized from various stoichiometric mixtures of 4-(4-(4-(4-carboxyphenoxy)phenyl)-1-oxophthalazin-2(1H)-yl)benzoic acid (CPPBC) and isophthalic acid (IPA) with 3,3'-diaminobenzidine (DAB) by solution polycondensation in polyphosphoric acid (PPA). The structures of the obtained polymers were characterized by FT-IR and H-1 NMR. The obtained polybenzimidazoles were found to be soluble in aprotic polar solvents such as N-methyl-2-pyrolidinone (NMP), N,N-dimethylacetamide (DMAc), dimethyl sulfoxide (DMSO) and m-cresol, without the addition of inorganic salts. The inherent viscosities of the polybenzimidazoles were in the range of 1.10-2.05 dL/g. All of the polymers show amorphous nature as evaluated by WAXD. These polymers have high glass transition temperatures (T(g)s) in the range of 398-408 degrees C. Thermogravimetric analysis exhibit that these polybenzimidazoles containing 4-phenyl phthalazinone moiety have excellent thermal stability with the temperatures for 5% and 10% weight loss of the polymers ranging from 516 to 594 degrees C and 560 to 672 degrees C, respectively. (C) 2011 Elsevier Ltd. All rights reserved.