Epc. Lai et Hs. Ghaziaskar, NONINVASIVE SPECTROSCOPIC DETECTION OF BULK-POLYMERIZATION BY STIMULATED RAMAN-SCATTERING, Applied spectroscopy, 48(8), 1994, pp. 1011-1014
The polymerization of styrene in a 15-cm storage bottle and of methyl
methacrylate (MMA) inside a 50-cm reactor cell was monitored noninvasi
vely by stimulated Raman scattering (SRS) for spectroscopic analysis.
A pulsed laser was required to stimulate Raman scattering while a phot
odiode array detector measured the monochromator-dispersed Stokes line
s. The results demonstrate that SRS is a useful spectroscopic techniqu
e for the real-time probing of polymerization in a large sample volume
. Its signal intensity is related to the average analyte concentration
integrated over the laser interaction path, which can better represen
t the bulk property of extended sample dimensions.