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Indexed by:期刊论文

Date of Publication:2009-07-01

Journal:POLYMER DEGRADATION AND STABILITY

Included Journals:SCIE、EI、Scopus

Volume:94

Issue:7

Page Number:1053-1060

ISSN No.:0141-3910

Key Words:s-Triazine; Poly(aryl ether)s; Heat-resistant; Activation energy; Thermodynamics

Abstract:Soluble and heat-resistant s-triazine-containing poly(aryl ether)s have been prepared for their potent utilities as high-temperature membranes and composite matrix materials. They have been synthesized by the nucleophilic displacement polymerization of 2,4-bis(4-fluorophenyl)-6-phenyl-1,3,5-triazine (BFPT) with each of resorcinol (RS), 4,4'-dihydroxydiphenyl sulfone (DS), and bisphenol-like 4-(4-hydroxylphenyl)(2H)-phthalazin-1-one (HP). The presence of meta-ether linkages, sulfone groups or phthalazinone moieties in the polymer chain results in an improvement in the solubility of s-triazinecontaining poly(aryl ether)s in common organic solvents (e.g., N,M-dimethylacetamide, N-methyl-2-pyrrolidinone). The new polymers are amorphous and exhibit excellent thermal stability. The apparent activation energy values (Ea) as determined by using Kissinger method are respectively 268.1, 245.9 and 215.1 kJ/mol under N(2) flow in dynamic heating conditions, for the first degradation stage of RS-PE, DS-PE and HP-PE, which are in well agreement with those values (272.6, 249.9 and 239.1 kJ/mol) determined by using Flynn-Wall-Ozawa method. The thermal stability classification among the polymers is made on the basis of the E, values, and it follows the decreasing order: RS-PE > DS-PE > HP-PE. The properties of these polymers have been also compared with those of corresponding poly(aryl ether)s. (C) 2009 Elsevier Ltd. All rights reserved.