期刊
POLYMERS FOR ADVANCED TECHNOLOGIES
卷 19, 期 12, 页码 1763-1770出版社
WILEY
DOI: 10.1002/pat.1192
关键词
polymeric photoinitiator; coinitiator amine; benzophenone; photopolymerization; polyurethane
资金
- Ministry of Science and Technology of China [2004AA33H010]
- Ministry Education of China
A novel diamine 3,5-diamino-4'-phenoxylbenzophenone (DAPBP) was synthesized from the reaction of 3,5-diamino-4'-chlorobenzophenone (DACBP) and phenol. Then through the polycondensation of DAPBP, toluene-2,4-diisocyanate (TDI), and N-methyldiethanolamine (MDEA), we obtained a PU-type polymeric photoinitiator containing side-chain benzophenone (BP) and tertiary amine in the same macromolecule (PUSOA). Another polymeric photoinitiator without coinitiator amine in polymer chain (PUSO) was also synthesized for comparison. FT-IR, H-1 NMR, and GPC analyses confirmed the structures of monomer and polymeric photoinitiators. The UV-Vis spectra of PUSOA, PUSO, and DAPBP are similar, and all exhibit the maximal absorption near 290 nm. ESR spectra indicate that PUSOA can generate active species most efficiently. The photopolymerization of PU acrylate, initiated by PUSOA, PUSO/MDEA, DAPBP/MDEA, and BP/MDEA, was studied by differential scanning photocalorimetry (photo-DSC). The results show that the in-chain coinitiator amine can significantly improve the photoefficiency of the polymeric photoinitiator and the PUSOA is more efficient for the polymerization of PU acrylate than its low-molecular-weight counterpart. Copyright (C) 2008 John Wiley & Sons, Ltd.
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