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Study of Novel PU‐Type Polymeric Photoinitiators Comprising of Side‐Chain Benzophenone and Coinitiator Amine: Effect of Macromolecular Structure on Photopolymerization
Author(s) -
Wei Jun,
Wang Hongyu,
Jiang Xuesong,
Yin Jie
Publication year - 2007
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.200600520
Subject(s) - photopolymer , tmpta , prepolymer , benzophenone , photoinitiator , polymer chemistry , monomer , chemistry , acrylate polymer , polymerization , polymer , side chain , materials science , photochemistry , acrylate , organic chemistry , polyurethane
Three PU‐type polymeric photoinitiators containing side‐chain benzophenone and coinitiator amine, PUSBA‐h, PUSBA‐t and PUSBA‐i, were synthesized via polycondensation of 3,5‐diamino‐4′‐thiophenylbenzophenone, different diisocyanates and N ‐methyldiethanolamine. FT‐IR, 1 H NMR and GPC analyses confirm the structures of all polymers. The UV‐vis spectra of polymeric photoinitiators are similar and all exhibit the maximal absorption near 320 nm. ESR spectra show PUSBA‐h and PUSBA‐t can efficiently generate free radicals. The photopolymerization of trimethylolpropane triacrylate and the PU prepolymer, initiated by these polymeric photoinitiators, was studied by photo‐DSC. The results indicate that the macromolecular structure has an important effect on photopolymerization, and different photoinitiators exhibit different behavior towards different monomers: PUSBA‐t is the most efficient for TMPTA and PUSBA‐h is the most efficient for PU prepolymer. The final conversion for the photopolymerization of PU prepolymer initiated by PUSBA‐h is greater than 97%.