Study on co[poly(butylene terephthalate-p-oxybenzoate)] thermotropic copolyester. I. Composition analysis and sequence distribution

✍ Scribed by Cheng-Fang Ou

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 117 KB
• Volume: 77
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/1097-4628(20000801)77:5<949::aid-app1>3.0.co;2-7

✦ Synopsis

Copolyesters made from Poly(butylene terephthalate) (PBT) and p-acetoxybenzoic acid (PAB) have been examined in solution by proton nuclear magnetic resonance (NMR) spectroscopy. Proton NMR spectra of solutions have shown that the sequence distribution for POB/PBT copolyesters can be described in terms of a probability model in which POB (p-oxybenzoate) has a chance that is almost random of being bonded to another POB in the copolyesters, with POB content ranging from 20 to 40 mol %. From the experimental data, we can predict that the higher the content of POB in copolyester is, the larger the deviation from randomness of sequence distribution is.