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Thermal polymerizations of alkali and alkaline earth 4‐vinylbenzoates in bulk
Author(s) -
Inoki Mari,
Akutsu Fumihiko,
Kitayama Yasuyuki,
Kasashima Yoshio,
Naruchi Kiyoshi
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19980401)199:4<619::aid-macp619>3.0.co;2-u
Subject(s) - alkali metal , polymerization , reactivity (psychology) , alkaline earth metal , chemistry , crystallinity , polymer chemistry , salt (chemistry) , monomer , polymer , anionic addition polymerization , inorganic chemistry , organic chemistry , crystallography , medicine , alternative medicine , pathology
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 number‐average 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.