Dually responsive aqueous gels from thermo- and light-sensitive hydrophilic ABA triblock copolymersElectronic supplementary information (ESI) available: Temperature ramp for a 10.0 wt% aqueous solution of ABA-1; frequency dependences of G′ and G′′ of a 10.0 wt% aqueous solution of ABA-3 after UV irradiation at 41, 48, and 65 °C; temperature ramps for aqueous solutions of ABA-3 with concentrations of 14.2, 10.0, 6.0, 4.0, and 3.0 wt%; temperature ramps for aqueous solutions of irradiated ABA-3 wi

Dually responsive aqueous gels from thermo- and light-sensitive hydrophilic ABA triblock copolymersElectronic supplementary information (ESI) available: Temperature ramp for a 10.0 wt% aqueous solution of ABA-1; frequency dependences of G′ and G′′ of a 10.0 wt% aqueous solution of ABA-3 after UV irradiation at 41, 48, and 65 °C; temperature ramps for aqueous solutions of ABA-3 with concentrations of 14.2, 10.0, 6.0, 4.0, and 3.0 wt%; temperature ramps for aqueous solutions of irradiated ABA-3 wi

We report in this article the synthesis of a series of thermo- and light-sensitive hydrophilic ABA linear triblock copolymers, poly(ethoxytri(ethylene glycol) acrylate- co - o -nitrobenzyl acrylate)- b -poly(ethylene oxide)- b -poly(ethoxytri(ethylene glycol) acrylate- co - o -nitrobenzyl acrylate)...

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Hauptverfasser: Woodcock, Jeremiah W, Wright, Roger A. E, Jiang, Xueguang, O'Lenick, Thomas G, Zhao, Bin
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Jiang, Xueguang
O'Lenick, Thomas G
Zhao, Bin
description We report in this article the synthesis of a series of thermo- and light-sensitive hydrophilic ABA linear triblock copolymers, poly(ethoxytri(ethylene glycol) acrylate- co - o -nitrobenzyl acrylate)- b -poly(ethylene oxide)- b -poly(ethoxytri(ethylene glycol) acrylate- co - o -nitrobenzyl acrylate) (P(TEGEA- co -NBA)- b -PEO- b -P(TEGEA- co -NBA)), with various NBA molar contents and the study of sol-gel transitions of their aqueous solutions. The copolymers were prepared by ATRP from a difunctional PEO macroinitiator; the polydispersity indexes of all polymers were
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E ; Jiang, Xueguang ; O'Lenick, Thomas G ; Zhao, Bin</creator><creatorcontrib>Woodcock, Jeremiah W ; Wright, Roger A. E ; Jiang, Xueguang ; O'Lenick, Thomas G ; Zhao, Bin</creatorcontrib><description>We report in this article the synthesis of a series of thermo- and light-sensitive hydrophilic ABA linear triblock copolymers, poly(ethoxytri(ethylene glycol) acrylate- co - o -nitrobenzyl acrylate)- b -poly(ethylene oxide)- b -poly(ethoxytri(ethylene glycol) acrylate- co - o -nitrobenzyl acrylate) (P(TEGEA- co -NBA)- b -PEO- b -P(TEGEA- co -NBA)), with various NBA molar contents and the study of sol-gel transitions of their aqueous solutions. The copolymers were prepared by ATRP from a difunctional PEO macroinitiator; the polydispersity indexes of all polymers were &lt;1.2. We demonstrated that a 10.0 wt% aqueous solution of a triblock copolymer with a NBA content of 9.3 mol% in the thermosensitive blocks underwent a thermo-induced reversible sol-gel transition and a UV-triggered gel-to-sol transition at a constant temperature. The UV-irradiated solution again can undergo a temperature-induced sol-gel transition but at a higher temperature. The thermo-triggered sol-gel transitions stemmed from the formation of a 3-dimensional network with the dehydrated thermosensitive blocks being associated into hydrophobic cores and the central PEO block forming bridges among micelles. Exposure to UV light cleaved hydrophobic o -nitrobenzyl groups, raised the LCST of thermosensitive blocks, and thus triggered a gel-to-sol transition at a constant temperature. Rheometry was employed to study the sol-gel transitions and gel characteristics. In addition, we studied the effects of polymer concentration and NBA content on sol-gel transition temperature ( T sol-gel ) and gel properties before and after UV irradiation. The T sol-gel increased with the decrease of polymer concentration; the critical gelation concentration for the triblock copolymer with a NBA content of 9.3 mol% was between 3 and 4 wt% before UV irradiation and between 5 and 6% after photocleavage of o -nitrobenzyl groups. The change of T sol-gel was in general larger for the copolymer with a higher NBA content after UV irradiation. 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E</creatorcontrib><creatorcontrib>Jiang, Xueguang</creatorcontrib><creatorcontrib>O'Lenick, Thomas G</creatorcontrib><creatorcontrib>Zhao, Bin</creatorcontrib><title>Dually responsive aqueous gels from thermo- and light-sensitive hydrophilic ABA triblock copolymersElectronic supplementary information (ESI) available: Temperature ramp for a 10.0 wt% aqueous solution of ABA-1; frequency dependences of G′ and G′′ of a 10.0 wt% aqueous solution of ABA-3 after UV irradiation at 41, 48, and 65 °C; temperature ramps for aqueous solutions of ABA-3 with concentrations of 14.2, 10.0, 6.0, 4.0, and 3.0 wt%; temperature ramps for aqueous solutions of irradiated ABA-3 wi</title><description>We report in this article the synthesis of a series of thermo- and light-sensitive hydrophilic ABA linear triblock copolymers, poly(ethoxytri(ethylene glycol) acrylate- co - o -nitrobenzyl acrylate)- b -poly(ethylene oxide)- b -poly(ethoxytri(ethylene glycol) acrylate- co - o -nitrobenzyl acrylate) (P(TEGEA- co -NBA)- b -PEO- b -P(TEGEA- co -NBA)), with various NBA molar contents and the study of sol-gel transitions of their aqueous solutions. The copolymers were prepared by ATRP from a difunctional PEO macroinitiator; the polydispersity indexes of all polymers were &lt;1.2. We demonstrated that a 10.0 wt% aqueous solution of a triblock copolymer with a NBA content of 9.3 mol% in the thermosensitive blocks underwent a thermo-induced reversible sol-gel transition and a UV-triggered gel-to-sol transition at a constant temperature. The UV-irradiated solution again can undergo a temperature-induced sol-gel transition but at a higher temperature. The thermo-triggered sol-gel transitions stemmed from the formation of a 3-dimensional network with the dehydrated thermosensitive blocks being associated into hydrophobic cores and the central PEO block forming bridges among micelles. Exposure to UV light cleaved hydrophobic o -nitrobenzyl groups, raised the LCST of thermosensitive blocks, and thus triggered a gel-to-sol transition at a constant temperature. Rheometry was employed to study the sol-gel transitions and gel characteristics. In addition, we studied the effects of polymer concentration and NBA content on sol-gel transition temperature ( T sol-gel ) and gel properties before and after UV irradiation. The T sol-gel increased with the decrease of polymer concentration; the critical gelation concentration for the triblock copolymer with a NBA content of 9.3 mol% was between 3 and 4 wt% before UV irradiation and between 5 and 6% after photocleavage of o -nitrobenzyl groups. The change of T sol-gel was in general larger for the copolymer with a higher NBA content after UV irradiation. 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E</au><au>Jiang, Xueguang</au><au>O'Lenick, Thomas G</au><au>Zhao, Bin</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Dually responsive aqueous gels from thermo- and light-sensitive hydrophilic ABA triblock copolymersElectronic supplementary information (ESI) available: Temperature ramp for a 10.0 wt% aqueous solution of ABA-1; frequency dependences of G′ and G′′ of a 10.0 wt% aqueous solution of ABA-3 after UV irradiation at 41, 48, and 65 °C; temperature ramps for aqueous solutions of ABA-3 with concentrations of 14.2, 10.0, 6.0, 4.0, and 3.0 wt%; temperature ramps for aqueous solutions of irradiated ABA-3 wi</atitle><date>2010-07-06</date><risdate>2010</risdate><volume>6</volume><issue>14</issue><spage>3325</spage><epage>3336</epage><pages>3325-3336</pages><issn>1744-683X</issn><eissn>1744-6848</eissn><abstract>We report in this article the synthesis of a series of thermo- and light-sensitive hydrophilic ABA linear triblock copolymers, poly(ethoxytri(ethylene glycol) acrylate- co - o -nitrobenzyl acrylate)- b -poly(ethylene oxide)- b -poly(ethoxytri(ethylene glycol) acrylate- co - o -nitrobenzyl acrylate) (P(TEGEA- co -NBA)- b -PEO- b -P(TEGEA- co -NBA)), with various NBA molar contents and the study of sol-gel transitions of their aqueous solutions. The copolymers were prepared by ATRP from a difunctional PEO macroinitiator; the polydispersity indexes of all polymers were &lt;1.2. We demonstrated that a 10.0 wt% aqueous solution of a triblock copolymer with a NBA content of 9.3 mol% in the thermosensitive blocks underwent a thermo-induced reversible sol-gel transition and a UV-triggered gel-to-sol transition at a constant temperature. The UV-irradiated solution again can undergo a temperature-induced sol-gel transition but at a higher temperature. The thermo-triggered sol-gel transitions stemmed from the formation of a 3-dimensional network with the dehydrated thermosensitive blocks being associated into hydrophobic cores and the central PEO block forming bridges among micelles. Exposure to UV light cleaved hydrophobic o -nitrobenzyl groups, raised the LCST of thermosensitive blocks, and thus triggered a gel-to-sol transition at a constant temperature. Rheometry was employed to study the sol-gel transitions and gel characteristics. In addition, we studied the effects of polymer concentration and NBA content on sol-gel transition temperature ( T sol-gel ) and gel properties before and after UV irradiation. The T sol-gel increased with the decrease of polymer concentration; the critical gelation concentration for the triblock copolymer with a NBA content of 9.3 mol% was between 3 and 4 wt% before UV irradiation and between 5 and 6% after photocleavage of o -nitrobenzyl groups. The change of T sol-gel was in general larger for the copolymer with a higher NBA content after UV irradiation. A 10.0 wt% aqueous solution of a thermo- and light-sensitive ABA triblock copolymer can undergo multiple sol-gel/gel-sol transitions in response to temperature changes and UV irradiation.</abstract><doi>10.1039/c000450b</doi><tpages>12</tpages></addata></record>
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title Dually responsive aqueous gels from thermo- and light-sensitive hydrophilic ABA triblock copolymersElectronic supplementary information (ESI) available: Temperature ramp for a 10.0 wt% aqueous solution of ABA-1; frequency dependences of G′ and G′′ of a 10.0 wt% aqueous solution of ABA-3 after UV irradiation at 41, 48, and 65 °C; temperature ramps for aqueous solutions of ABA-3 with concentrations of 14.2, 10.0, 6.0, 4.0, and 3.0 wt%; temperature ramps for aqueous solutions of irradiated ABA-3 wi
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