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Chain‐Growth Polycondensation in Solid‐Liquid Phase with Ammonium Salts for Well‐Defined Polyesters
Author(s) -
Yokozawa Tsutomu,
Maeda Daisuke,
Hiyama Norihiko,
Hiraoka Shuichi
Publication year - 2001
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 - 10.1002/1521-3935(20010701)202:11<2181::aid-macp2181>3.0.co;2-f
Subject(s) - polymer chemistry , monomer , chemistry , polymerization , chain transfer , chain growth polymerization , condensation polymer , dispersity , molar mass distribution , solution polymerization , polymer , radical polymerization , organic chemistry
Polycondensation of a potassium 4‐bromomethylbenzoate derivative dispersed in organic solvent was carried out with tetrabutylammonium iodide as a phase transfer catalyst (PTC) and a reactive benzyl bromide as an initiator to yield polyesters having a defined molecular weight and a narrow molecular weight distribution ( M̄ w / M̄ n < 1.3). Polymerization involves the transfer of monomer to organic solvent layer with the PTC and the reaction of monomer with the initiator and the polymer end benzyl bromide moiety in a chain polymerization manner, as evidenced by polymerization behavior; increase of the molecular weight in proportion to monomer conversion and equal amount of the initiator unit and the end group in polymer irrespective of monomer conversion. Furthermore, the molecular weight increased in proportion to feed ratio ([monomer] 0 /[initiator] 0 ), and the polydispersity index M̄ w / M̄ n stayed less than 1.3 over the whole range of feed ratio.