THERMAL-DECOMPOSITION ANALYSIS OF SPIN-COATED FILMS OF PARTLY PROTECTED POLYVINYLPHENOL WITH THE T-BUTOXYCARBONYL GROUP USING TIME-RESOLVEDIR

Thermal decomposition of spin-coated films of partly protected polyvin ylphenol with the t-butoxycalbonyl (tBOC-PVP) group has been investiga ted by monitoring the intensity of the carbonyl stretching peak of the tBOC group by using temperature-variable time-resolved infrared spect roscopy (TR/IR). The temperature programming method has been used far determining the activation energy (E-a) of the thermal decomposition. We compared the thermal decomposition behavior of tBOC-PVP films with that of the powders and the behavior of a 22% protected tBOC-PVP film with that of a 66% protected tBOC-PVP film. It was found that the E-a of the 22% protected tBOC-PVP film is distinctively higher than the ot hers including the result given from thermogravimetric analysis (TG). In addition, the E-a of the 22% protected tBOC-PVP him increased up to 50 kcal/mol with the decrease of the remaining tBOC group, while the others were constant at 30 kcal/mol. Diglyme, which was used as the so lvent in the 22% protected tBOC-PVP him, was residual after the temper ature increased above 80 degrees C, and the reaction velocity of the t BOC group increased in accordance with the generation of the OH group, These results suggest that the OH group, which accelerates the therma l decomposition of tBOC-PVP, is hindered by the residual solvent in th e case of the 22% protected tBOC-PVP films.