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Fullerene Substitution of Donor/Acceptor Branched Disubstituted Polyacetylenes: Significantly Accelerated Polymerization by the C 60 Pendant
Author(s) -
Li Minghua,
Li Xiaofang,
Xu Pan,
Yang Shangfeng
Publication year - 2010
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.200900447
Subject(s) - monomer , polymerization , polymer chemistry , chemistry , polyacetylene , metathesis , photochemistry , fluorescence , polymer , organic chemistry , physics , quantum mechanics
A novel type of soluble donor/acceptor branched disubstituted polyacetylene ( PA–C 60 ) bearing C 60 and soft pentyl moieties in side‐chains was synthesized successfully. The product has been characterized by FTIR, 1 H NMR, 13 C NMR, CH COSY, UV‐vis, and fluorescence spectroscopies, confirming its branched polymeric structure comprising polyacetylene chains and covalently bound C 60 cages in side‐chains. Surprisingly, completely different from the conventional metathesis polymerization of acetylenes, it is found for the first time that the disubstituted monomer 4 can be polymerized within a very short reaction time (up to 1.5 min) and the molecular weight of the synthesized PA–C 60 is independent of the reaction time. A plausible interpretation is proposed to understand the rapid polymerization reaction accelerated by the C 60 pendant. The optical properties of PA–C 60 were studied by UV‐vis absorption and fluorescence spectroscopies, which indicated that the fluorescence of PA–C 60 is significantly enhanced compared to monomer 4 , presumably due to its branched structure. SEM studies on the thin film morphology of PA–C 60 in comparison with monomer 4 suggested the successful polymerization of monomer 4 and revealed that PA–C 60 has a much smoother morphology than the aggregated morphology of monomer 4 .