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Synthesis of Substituted Polyacetylenes Grafted with Polystyrene Chains by the Macromonomer Method and Their Characterization
Author(s) -
Zhang Wei,
Shiotsuki Masashi,
Masuda Toshio
Publication year - 2006
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/macp.200600107
Subject(s) - macromonomer , copolymer , polystyrene , polymer chemistry , phenylacetylene , polymerization , polyene , side chain , conjugated system , polyacetylene , acetylene , atom transfer radical polymerization , chemistry , materials science , polymer , catalysis , organic chemistry
Summary: A macromonomer ( 1 ) consisting of a polystyrene chain and an acetylenic chain end ( $\overline M _{\rm n}$ = 2 500, $\overline M _{\rm w} /\overline M _{\rm n}$ = 1.20) was prepared by atom transfer radical polymerization. Macromonomer 1 was copolymerized with phenylacetylene ( 2 ) and propargyl 2‐bromopropionate ( 3 ) by using Rh catalysts at varying feed ratios from 10 to 50 wt.‐% to produce graft copolymers 4 and 5 , respectively. The synthesized copolymers 4 and 5 possessed a conjugated polyene main‐chain and polystyrene grafts, and contained 11–34 and 16–77 wt.‐% of polystyrene with $\overline M _{\rm n}$ of 61 400–144 000 and 19 300–22 500, respectively. Graft copolymer 4 was a yellow solid and thermally stable up to 225 °C, whereas 5 was a brown solid with weight loss beginning at 175 °C. Graft copolymers 4 and 5 exhibited UV‐vis absorption edges at 525 and 425 nm, respectively, which are attributable to the conjugated main‐chain structure.Copolymerization of the acetylene‐terminated polystyrene‐based macromonomer with monosubstituted acetylenes.