Kinetic studies on copolycondensation processes. V. Investigations on sequence distribution of fully aromatic copolyester by PMR spectroscopy

✍ Scribed by M. Matlengiewicz; M. Gibas; E. Turska

• Publisher: John Wiley and Sons
• Year: 1979
• Tongue: English
• Weight: 303 KB
• Volume: 23
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1979.070231110

✦ Synopsis

PMR spectroscopy and lanthanide shift reagents were used to determine sequence distribution of units of poly(dimethy1dian-phenolphta1ein)terephthalate. The calculated values of degree of randomness confirm the theory that the copolyester obtained at the isokinetic temperature (200°C) has random distribution of comonomer units and copolyesters obtained at temperatures above and below this temperature have a tendency to form block units along the macromolecular chain.