Synthesis and randomization of well-defined sequence, wholly aromatic copolyester/esteramides

✍ Scribed by Eui-Won Choe; Marie Borzo

• Book ID: 102737362
• Publisher: John Wiley and Sons
• Year: 1994
• Tongue: English
• Weight: 750 KB
• Volume: 53
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1994.070530513

✦ Synopsis

Well-defined sequence, wholly aromatic copolyester/esteramides have been synthesized by an interfacial polycondensation of a preformed triad diacid chloride monomer, di (parachlorocarbonylphenyl) isophthalate, with the disodium salt of hydroquinone or of deuterated hydroquinone, or with meta-phenylene diamine. Carbon-13 nuclear magnetic resonance ( NMR) spectroscopy provided unequivocal evidence for regularly alternating polymer structures, and coupled with statistical methods, for randomization on heating in the case of regularly alternating poly ( p -0xybenzoateco-p -phenylene isophthalate ) . Polymers synthesized using standard high-temperature melt-polymerization techniques were shown by statistical/carbon-13 NMR methods to have essentially random structures. Thermal properties of copolymer powders and films were found to vary with monomer sequence distribution as well as with composition.