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Efficiency of 4,4′‐bis( N , N ‐diethylamino) benzophenone for the polymerization of dimethacrylate resins in thick sections
Author(s) -
Schroeder Walter F,
Asmussen Silvana L,
Cook Wayne D,
Vallo Claudia I
Publication year - 2011
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.3089
Subject(s) - polymerization , benzophenone , monomer , photopolymer , photochemistry , materials science , photobleaching , bulk polymerization , polymer chemistry , methyl methacrylate , photoinitiator , polymer , chemistry , radical polymerization , optics , composite material , fluorescence , physics
The efficiency of 4,4′‐bis( N , N ‐diethylamino)benzophenone (DEABP) for the polymerization of dimethacrylate monomers in thick sections (1–2 mm) was studied. DEABP (λ max = 365 nm) represents a complete initiating system as it contains both ketone and amine functional groups. During irradiation, DEABP photobleaches at a fast rate causing deeper penetration of light through the underlying layers, but the photoinitiation efficiency (rate of polymerization per photon absorption rate) is relatively poor. As a result, irradiation of methacrylate monomers at 365 nm results in a slow average polymerization rate and a reduced monomer conversion for thick sections due to the light attenuation caused by the high absorptivity of DEABP and photolysis products. These results highlight the inherent interlinking of light attenuation and photobleaching rate in polymerization of thick sections. Copyright © 2011 Society of Chemical Industry