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231225s2020 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.9b03026
|2 doi
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|a (NLM)31917924
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|a DE-627
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|a eng
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| 100 |
1 |
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|a Deng, Xuanli
|e verfasserin
|4 aut
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|a pH-Responsive Copolymer Films Prepared by Surface-Initiated Polymerization and Simple Modification
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|c 2020
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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| 338 |
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Revised 04.03.2020
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a We report the preparation of pH-responsive, ester/carboxylic acid random copolymer films via simple modification of poly(norbornene diacyl chloride) (pNBDAC), prepared via surface-initiated ring-opening metathesis polymerization, with mixtures of water and ethanol to form carboxylic acid and ethyl ester side groups. The pNBDAC film serves as a compositionally versatile platform to controllably obtain copolymers with multiple functionalities. In modifying the pNBDAC to form the copolymer film, ethanol exhibits a significantly higher reactivity with acyl chloride groups within the film than does water. The magnitude and range of the pH-responsive performance are highly dependent on the carboxylic acid content in the copolymer films, which demonstrates the effect of film hydrophilicity on the pH-responsive switching of ionic barrier properties. The resistance of the film against ion transfer can be decreased by a factor of 104 through pH change, demonstrating pH-induced switching from hydrophobic and insulating to swollen and ion-permeable films. The interactions of the copolymer films with water at different pH values were also explored. When the copolymer contains 34% carboxylic acids, a 4× greater film thickness is obtained in high pH solution than in low pH solution due to ionically driven water swelling. The reversibility of the pH-responsive performance of these copolymer films is high based on measurements using quartz crystal microbalance with dissipation (QCM-D)
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|a Journal Article
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|a Livingston, Joshua L
|e verfasserin
|4 aut
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|a Spear, Nathan J
|e verfasserin
|4 aut
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|a Jennings, G Kane
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 36(2020), 3 vom: 28. Jan., Seite 715-722
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|x 1520-5827
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|g volume:36
|g year:2020
|g number:3
|g day:28
|g month:01
|g pages:715-722
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|u http://dx.doi.org/10.1021/acs.langmuir.9b03026
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