Characteristic ratio of the mean-square end-to-end distance of poly(vinylidene fluoride) with microstructural defects

✍ Scribed by Zhiping Zhou; Deyue Yan; Giovanni C. Alfonso

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 353 KB
• Volume: 4
• Category: Article
• ISSN: 1022-1344
• DOI: 10.1002/mats.1995.040040306

✦ Synopsis

The segment length distribution of isoregic head-to-head and tail-to-tail sequences in poly-(vinylidene fluoride) (PVF,) a) chains is calculated from I9F NMR literature data. It is found that the average length of inverse segments is very close to one unit; therefore almost all head-to-head defects are immediately repaired by an adjacent tail-to-tail addition. The role of microstructure on the characteristic ratio of the end-to-end distance is then investigated. Results obtained by two different methods indicate that, in agreement with previous Monte Carlo calculations, defects play a minor role for the conformational characteristics of PVF,. However, a slight contraction of about 4% is expected for very defective chains. a) System. name: poly( I , 1 -difluoroethylene),