FT-IR Study and Chemometric Analysis of Photoinduced Crosslinking in Thymine Copolymers

K. MCDONOUGH; S. BORTOLATO; K. THOMAS; N. LEE; R. W. GURNEY; D.M. MARTINO

San Diego

Congreso; 243rd ACS National Meeting & Exposition; 2012

ACS

The photo-induced immobilization of 4-vinylbenzyl thymine (VBT) and 4-vinylbenzyl triethyl ammonium chloride (VBA) copolymers has been investigated with the aid of grazing-angle specular-reflectance FT-IR. As irradiation time increases, changes in the structure of pendant thymine groups in the copolymer due to the crosslinking process result in shifts of the copolymer network’s vibrational frequencies, as well as changes in numerous IR band intensities. In this work, chemometric (multivariate resolution) methods have been applied to the FTIR data obtained while monitoring the time evolution of curing of VBT:VBA copolymers of varying composition. The spectral data obtained with FT-IR normally provide information only about the degree of conversion of the reactants in the final product but there is no knowledge about how many compounds are involved or how they evolve over time. The use of the so-called Multivariate Curve Resolution-Alternating Least Squares (MCR-ALS) allows the sequentially estimation of  the contribution to the signal due to the different species in the matrix data.