title: Reversible swelling-shrinking behavior of hydrogen-bonded free-standing thin film stabilized by catechol reaction.
abstract: Dopamine-modified poly(acrylic acid) (PAA-dopa) and poly(vinylpyrrolidone) (PVPON) was layer-by-layer (LbL) assembled to prepare thin film based on hydrogen bonding. The carboxylic group of acrylic acid and the phenolic hydroxyl group of dopamine can both act as hydrogen bond donors. The critical assembly and the critical disintegration pH values of PVPON/PAA-dopa film are enhanced compared with PVPON/PAA film. The hydrogen-bonded PVPON/PAA-dopa thin film can be cross-linked via catechol chemistry of dopamine. After cross-linking, the film can be exfoliated from the substrate in alkaline solution to get a free-standing film. Moreover, by tuning the pH value, deprotonation and protonation of PAA will make the hydrogen bond in the film break and reconstruct, which induces that the free-standing film has a reversible swelling-shrinking behavior.
authors.affiliation: †State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620, China.
authors.forename: Jiaxing
authors.initials: J
authors.lastname: Sun
authors.affiliation: †State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Su
authors.affiliation: †State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620, China.
authors.forename: Xuejian
authors.initials: X
authors.lastname: Zhang
authors.affiliation: †State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620, China.
authors.forename: Wenjing
authors.initials: W
authors.lastname: Yin
authors.affiliation: ‡Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Xu
authors.affiliation: †State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620, China.
authors.forename: Shuguang
authors.initials: S
authors.lastname: Yang
mesh_terms: D002396:Catechols / Q000737:chemistry*; D006860:Hydrogen Bonding; D006863:Hydrogen-Ion Concentration; D008567:Membranes, Artificial; D015394:Molecular Structure
chemical_list: D002396:Catechols; D008567:Membranes, Artificial; C034221:catechol