Temperature and pH dual-responsive behavior of dendritic poly(N-isopropylacrylamide) with a polyoligomeric silsesquioxane core and poly(2-hydroxyethyl methacrylate) shell
Toh, Cher Ling
Date of Issue2013
School of Materials Science and Engineering
Novel temperature and pH dual-responsive dendritic polyoligomeric silsesquioxane (POSS)–poly(N-isopropylacrylamide) (PNIPAm)–poly(2-hydroxyethyl methacrylate) (PHEMA) copolymers are prepared via atom transfer radical polymerization and click reactions. The cloud points (Tc) decrease with decreasing pH from 10.0 to 5.0 due to the weakened inter-molecular interactions and enhanced intra-molecular hydrogen bonding, whereas the Tc exhibits a small increase from pH 5.0 to 4.0 because of the better solvation of PHEMA at highly acidic conditions. The above findings are corroborated by the different sizes of aggregates observed by dynamic light scattering. The encapsulation of a fluorescent dye and stimulated release by temperature and pH changes are also demonstrated.
Materials Science and Engineering
Macromolecular chemistry and physics