Abstract
The polysilsesquioxanes (PSQs) having the graft block copolymer of N-isopropylacrylamide (NIPAM) and N,N-dimethylacrylamide (DMAA), which showed the different sequence and number of the monomer units, were obtained by RAFT process. In addition, the PSQ derivatives containing other organic functional groups besides the grafted polymers were prepared by the use of chloromethylphenyl groups on the starting PSQ. Through the formation of ester bond and quarternary ammonium salt, phenol, triethylamine, and N,N-dimethylaniline groups were introduced into the grafted PSQ, respectively. In the behaviors of reversible thermoresponsive aggregation caused by poly(NIPAM) component, the almost same Lowest Critical Solution Temperature such as 34 °C was observed for the grafted PSQs, although the poly(DMAA), phenol groups, and/or the quarternary ammonium salts were existed on the same PSQ backbone. As an additional function, the presence of phenol groups led to pH responsive solubility in water. The solubility of the PSQs in water was also affected by hydrophilic property of the amines to form the quarternary ammonium salts. In addition, a kind of chromism, which related with pH value, was observed in the case containing N,N-dimethylaniline moieties.
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Masuda, T., Yamamoto, Si., Moriya, O. et al. Preparation of Stimuli-responsive Polysilsesquioxane Grafted Block Copolymer of Acrylamide Monomers. Polym J 40, 126–136 (2008). https://doi.org/10.1295/polymj.PJ2007154
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DOI: https://doi.org/10.1295/polymj.PJ2007154