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Synthesis and properties of new polyamides derived from 2,2-bis[4-[2-(4-aminophenoxy)ethoxy]phenyl]sulfone by direct polycondensation

โœ Scribed by Der-Jang Liaw; Been-Yang Liaw; Kuo-Liang Su

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
143 KB
Volume
10
Category
Article
ISSN
1042-7147

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โœฆ Synopsis

A series of new polyamides containing both sulfone and oxyethylene moieties in the polymer chain was prepared by the direct polycondensation of the diamine monomer 2,2-bis[4-[2-(4-aminophenoxy)ethoxy]phenyl]sulfone (BAEPS) and various aromatic dicarboxylic acids in Nmethyl-2-pyrrolidinone (NMP) using triphenyl phosphite and pyridine as condensing agents. Polymers were produced with inherent viscosities of 0.30ยฑ0.60 dl/g and identified by elemental analysis, and infrared and nuclear magnetic resonance spectra. Most of the polymers were readily dissolved in polar solvents such as NMP, dimethylsulfoxide, N,N-dimethylacetamide, N,N-dimethylformamide and m-cresol at room temperature. Polymers containing rigid and symmetric p-phenylene, naphthalene and p-biphenylene moieties revealed a crystalline nature and showed no solubility in organic solvents. These polyamides had 10% weight loss temperatures ranging between 423 and 465 8C in nitrogen atmosphere and glass transition temperatures between 170 and 305 8C. The polymers with crystallinity nature exhibited melting endotherms (T m ) below 386 8C

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