Efficiency of 4,4?-bis(N,N-diethylamino) benzophenone for the Polymerization of Dimethacrylate Resins in Thick Sections

WALTER F. SCHROEDER; SILVANA L. ASMUSSEN; WAYNE D. COOK; CLAUDIA I. VALLO

Mar del Plata

Taller; 2º Taller de Órganos Artificiales, Biomateriales e Ingeniería de Tejidos; 2011

Sociedad Argentina de Bioingeniería, Universidad Nacional de Mar del Plata

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 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 the light through the underlying layers, but the photoinitiation efficiency is relatively poor. Irradiation of BisTEG/DEABP at 365 nm results in a slow 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.