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PH-responsive smart hydrogels

He et al. (2011) synthesized a pH-responsive hydrogel based on bor-onate-catechol complexation using 1,3-benzenediboronic acid and catechol end groups present on 4-arm PEG catechol (cPEG) (Fig. 8.5). Under basic aqueous conditions, the 1,3-benzenediboronic acid establishes a tetrahedral borate ester with the catechol end moieties of 4-arm PEG catechol and forms a three-dimensional, pH-responsive smart hydrogel. [Pg.243]

Another area in which smart hydrogels are likely to find application is the development of more efficient drug delivery systems. One material that has showed promise in this held is called Pluronic-PAA. Its trade name is Smart Hydrogel . The material is a mixture of two polymers, one of which is poly(acrylic acid) (PAA), which attaches readily to other biological materials and is responsive to changes in pH. The other polymer is a copolymer of poly(propylene oxide) (PPO) and poly(ethylene oxide) (PEO). This copolymer belongs to a family of polymers known by the trade name of Pluronic polymers. [Pg.146]

Hydrogels are highly hydrated 3D physically or chemically crosslinked polymer networks. Smart hydrogels can respond to environmental stimuli such as light, temperature, electric or magnetic fields, pH, ions, and chemical or biochemical molecules. Here, the responses may include gelation, reversible adsorption on a surface, and alteration between hydrophilic and hydrophobic states [114, 115],... [Pg.98]

Smart hydrogels can change their volume by a large fraction in response to many stimuh, such as temperature, pH, ions concentration, solvent composition and light irradiation. This environmental sensitivity plays an important role in achieving new technological and scientific applications. [Pg.89]

InteUigent (smart) hydrogels, which can change their swelling behavior and other properties in response to environmental stimuli such as temperature, pH, solvent composition, and electric fields, have found wide applications in drag delivery. Ionic marine polysaccharides may exert biological functions in addition to their stimuli-responsive characters (Alvarez-Lorenzo et al., 2013 Prabaharan and Mano, 2006). Composites and grafted polymers can reinforce and extend their responsiveness. [Pg.114]

Key words thermal-responsive polymer, moisture-responsive polymer, thermal-responsive hydrogel, pH-responsive hydrogel, smart textiles. [Pg.437]

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See also in sourсe #XX -- [ Pg.240 , Pg.242 ]



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