Characterization of thermoreversible polymer gels by the degree of crystallinity by surface area

✍ Scribed by Yoshio Hoei; Masaru Okabe; Kazuo Yamaura; Shuji Matsuzawa

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 633 KB
• Volume: 34
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19960930)34:13<2775::aid-pola23>3.0.co;2-8

✦ Synopsis

A characterization for crystalline junction polymer gels has been extended by introducing a new parameter which implies a measure of the number of the polymer molecules passing through the crystallizing junctions. The parameter has been considered in a theoretical gel melting relation derived by Takahashi, Nakamura, and Kagawa and a crystallite size distribution has also been considered. The equation obtained was examined on ethylenepropylene copolymer gels by using the previous data of melting temperatures determined from DSC, crystallite sizes from x-ray and DSC measurements, and reaction probabilities from '"C-NMR measurements. Consequently, the parameter was found to be helpful as one additional measure. Also, it was confirmed that the average crystallite sizes estimated in several different ways were all in good agreement with the conventional data. 0 1996 John Wiley & Sons, Inc.