✦ LIBER ✦

Gelation in the copolymerization of methyl methacrylate with trimethylolpropane trimethacrylate

✍ Scribed by Akira Matsumoto; Hiroyuki Ando; Masayashi Oiwa

Book ID: 103076219
Publisher: Elsevier Science
Year: 1989
Tongue: English
Weight: 343 KB
Volume: 25
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(89)90155-9

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✦ Synopsis

Three-dimensional network formation in the copolymerization of methyl methacrylate with trimethylolpropane trimethacrylate (TMPMA) is discussed. In order to clarify structural features of the copolymer, the cyclization constant of TMPMA was estimated to be K c = 4.2 mol/l and thus, the TMPMA units incorporated into the primary chain consisted of 18% noncyclic and 82% monocyclic structures for a typical copolymer. The gel points obtained under various polymerization conditions depended more significantly on dilution than on the amount of crosslinker. The molecular weight and intrinsic viscosity data suggest the occurrence of intramolecular cyclization leading to the formation of loop structures which was confirmed by GPC-LALLS measurement. Solution properties of the resulting copolymers are discussed in connection with the occurrence of intramolecular crosslinking which becomes more significant with the progress of polymerization.

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