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Synthesis and solution properties of alternating maleimide/styrene hyperbranched copolymers via controlled radical mechanism
Author(s) -
Ishizu Koji,
Takashimizu Chisato,
Shibuya Takeshi,
Uchida Satoshi
Publication year - 2003
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1187
Subject(s) - copolymer , maleimide , polymer chemistry , monomer , radical , solvent , molecule , macromolecule , reactivity (psychology) , styrene , materials science , polymerization , radical polymerization , chemistry , photochemistry , polymer , organic chemistry , biochemistry , alternative medicine , pathology , medicine
Copolymerizations of ( N , N ‐diethyldithiocarbamyl)methylstyrene (inimer: DTCS) with maleimide (MI) were carried out under UV irradiation. DTCS monomers play an important role in this copolymerization system as an inimer that is capable of initiating radical polymerization of the vinyl group. Reactivity ratios ( r 1 = 0.15 and r 2 = 0) were estimated by the curve‐fitting procedure (DTCS [M 1 ]; MI[M 2 ]). These reactivities show strong alternation, and the propagating copolymer radicals proceed with homopolymerization of 1:1 complexes formed between the donor and acceptor monomers. These alternating copolymers exhibit highly branched structure and are actually hyperbranched copolymers. The compact nature of the hyperbranched molecules was demonstrated by comparison of their dilute‐solution properties with those of the linear analogues. The hyperbranched macromolecules behave as single, well‐separated molecules (even in good solvent) and as hard spheres. Copyright © 2003 Society of Chemical Industry