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Title: Temperature and pH dual-responsive behavior of dendritic poly(N-isopropylacrylamide) with a polyoligomeric silsesquioxane core and poly(2-hydroxyethyl methacrylate) shell
Authors: Bai, Yu
Yang, Liping
Toh, Cher Ling
He, Chaobin
Lu, Xuehong
Keywords: Materials Science and Engineering
Issue Date: 2013
Source: Bai, Y., Yang, L., Toh, C. L., He, C., & Lu, X. (2013). Temperature and pH Dual-Responsive Behavior of Dendritic Poly(N-isopropylacrylamide) with a Polyoligomeric Silsesquioxane Core and Poly(2-hydroxyethyl methacrylate) Shell . Macromolecular Chemistry and Physics, 214(3), 396-404.
Series/Report no.: Macromolecular chemistry and physics
Abstract: 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.
ISSN: 1022-1352
DOI: 10.1002/macp.201200578
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles

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