3 years ago

Effect of glass transition temperature on heat-responsive gas bubbles formation from polymers containing tert-butoxycarbonyl moiety

Effect of glass transition temperature on heat-responsive gas bubbles formation from polymers containing tert-butoxycarbonyl moiety
Akikazu Matsumoto, Yuta Hiraoka, Haruyuki Okamura, Chu Jing, Masashi Iseki, Eriko Sato
Various types of polymers containing tert-butoxycarbonyl (BOC) moiety as the typical protecting group of functional moieties have been used for the design of stimuli-responsive polymer materials. In this study, we investigated the heat-responsive deprotection behavior of BOC-containing polymers obtained by radical polymerization of 4-(tert-butoxycarbonyloxy)styrene (BSt) and copolymerizations of BSt with styrene and methyl acrylate. The deprotection of BOC groups accompanying the evolution of isobutene and carbon dioxide as gaseous products was monitored by thermogravimetric analyses at different temperature circumstances; that is, on heating at a rate of 10 °C/min and under isothermal conditions at various temperatures. The deprotection resulted in a significant decrease in the transmittance of visible light due to the formation of a large number of gas bubbles, that is, foaming, in the polymer films when a heating temperature was close to the glass transition temperature of the used polymer. The potential of BOC-containing polymers was also evaluated as the heat-responsive adhesive polymers for dismantlable adhesion. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46252.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/app.46252

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