Study of Laser‐Induced Photopolymerizations by Optical Pyrometry

Abstract

Summary: Studies of the 355 nm laser induced free radical and cationic photopolymerization reactions of mono‐ and multifunctional monomers were conducted. These investigations were carried out with the aid of a specially constructed optical pyrometry instrument that provides rapid, reproducible temperature versus time profiles for these fast photopolymerization reactions. Using this technique, the effects of various reaction parameters and monomer structures on the rate and extent of the photopolymerization reactions were examined.Optical pyrometry instrument for the monitoring of laser‐induced photopolymerizations.magnified imageOptical pyrometry instrument for the monitoring of laser‐induced photopolymerizations.

A Critical Overview of Sensors for Monitoring Polymerizations

“…Bendada et al61, 62 studied the use of a hollow waveguide IR thermometer in injection molding to measure the temperature of the polymer film, since other types of thermometers were not able to measure the surface temperature of the film. IR thermometers have also been coupled with an attenuated total reflectance (ATR) Fourier‐transform IR (FTIR) spectrometer to monitor temperature and chemical conversion 63–65…”

Novel analytical method for the crosslinking process: Infrared thermographic analysis of the thermally latent cationic polymerization of a spiroorthoester and a bifunctional oxetane for the construction of a low‐shrinkage curing system

“…One of the efficient screening systems for multiple heterogeneous samples is a noncontact measurement of temperatures in reaction mixtures, which typically rise with the reaction courses. 9,[20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] Crivello and coworkers [20][21][22][23][24][25][26][27] have established a facile and reproducible analytical method for the photoinitiated polymerization of various monomers. From this point of view, we have preliminarily investigated (co)polymerizations of SOE and oxetane monomers with thermally latent sulfonium salts.…”