Thermal polymerizations of alkali and alkaline earth 4-vinylbenzoates in bulk

✍ Scribed by Mari Inoki; Fumihiko Akutsu; Yasuyuki Kitayama; Yoshio Kasashima; Kiyoshi Naruchi

• Book ID: 101306626
• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 364 KB
• Volume: 199
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/(sici)1521-3935(19980401)199:4<619::aid-macp619>3.0.co;2-u

✦ Synopsis

Thermal polymerizations of alkali and alkaline earth 4-vinylbenzoates (4-VBAs) in bulk were investigated. The relative reactivity of the alkali salts decreases in the following order: K > Na > Li, which is in reverse order to that of alkali methacrylates. In the polymerization of K-4-VBA at 240°C the numberaverage molecular weight decreases with increasing reaction time, although the yield of polymer increases. The polymerization of the K salt proceeds as long as the crystallinity of the monomeric salt is maintained, and is terminated when there is no crystalline compound in the reaction mixture left. The relative reactivity of the alkaline earth salts decreases in the following order: Mg > Ca > Sr + Ba. The polymerization of Mg-4-VBA proceeds rapidly at 240°C in the initial stage (30 min) and then levels off, however, the appearance of the reaction mixture still remains crystalline.