A note on analysis of glass transition temperature data of steric copolymers

✍ Scribed by Hidematsu Suzuki; Noritaka Kimura; Yoshiyuki Nishio

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 401 KB
• Volume: 35
• Category: Article
• ISSN: 0032-3861
• DOI: 10.1016/s0032-3861(05)80023-0

✦ Synopsis

The tacticity dependence of the glass transition temperature (Tg) of a steric copolymer, such as poly(methyl methacrylate), composed of meso and racemic dyads, is discussed using T~ equations which is useful for ordinary copolymers. With the T~ values of isotactic and syndiotactic forms together with that of the heterotactic form newly determined therefrom, it was shown to predict satisfactorily the Tg value of a given steric copolymer from its triad data. In addition, it turned out that in a plot of Tg against dyad or (syndiotactic) triad fraction, a linear correlation can be expected only for steric copolymers containing negligible amounts of the heterotactic triad and, in general, the data are scattered due to different polymerization kinetics.