TY - JOUR
T1 - Molecular Aggregation Structure and Surface Properties of Biomimetic Catechol-Bearing Poly[2-(perfluorooctyl)ethyl acrylate] and Its Application to Superamphiphobic Coatings
AU - Ma, Wei
AU - Ameduri, Bruno
AU - Takahara, Atsushi
N1 - Funding Information:
The authors acknowledge the financial support of JSPS Grant-in-aid for Scientific Research (A) (grant nos. 26248053 and 17H01221). WAXD measurements were conducted on the BL05XU beamline in SPring-8 with the approval of the Impact project. GI-WAXD measurements were conducted on the BL40B2 beamline in SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (proposal no. 2018A1177). The authors thank Chao-Hung Cheng (Graduate School of Engineering Kyushu University) and Prof. Yuji Higaki (Faculty of Science and Technology Oita University) for their assistance in WAXD and GI-WAXD measurements.
Funding Information:
The authors acknowledge the financial support of JSPS Grant-in-aid for Scientific Research (A) (grant nos. 26248053 and 17H01221). WAXD measurements were conducted on the BL05XU beamline in SPring-8 with the approval of the Impact project. GI-WAXD measurements were conducted on the BL40B2 beamline in SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (proposal no. 2018A1177). The authors thank Chao-Hung Cheng (Graduate School of Engineering, Kyushu University) and Prof. Yuji Higaki (Faculty of Science and Technology, Oita University) for their assistance in WAXD and GI-WAXD measurements.
Publisher Copyright:
Copyright © 2020 American Chemical Society.
PY - 2020/4/14
Y1 - 2020/4/14
N2 - The molecular aggregation structure and surface properties of a catechol-bearing fluoropolymer, P(FAC8-co-DOPAm), which was synthesized by conventional radical copolymerization of 2-(perfluorooctyl)ethyl acrylate (FAC8) and N-(3,4-dihydroxyphenethyl)acrylamide (DOPAm), and its application to the superamphiphobic surfaces are presented. The crystallinity of P(FAC8-co-DOPAm) was lower than that of poly[2-(perfluorooctyl)ethyl acrylate] (PFAC8). The perfluoroalkyl (Rf) groups were ordered on the surface with CF3 terminals exposed to air, and the Rf ordering was influenced by thermal history: the thermally annealed film exhibited higher Rf ordering than the unannealed one. The surface free energy was estimated to be γ= 7.32 mJ m-2 for both the unannealed and annealed films. Based on contact angle measurement, various interfacial structures of water and oils in accordance with the surface aggregation structure of Rf groups were proposed. Dewetting of the PFAC8 film at elevated temperature was suppressed by the introduction of catechol groups in the backbone. The degradation temperature of PFAC8 was improved significantly, and the evaporation of the low molar mass-polymer was inhibited by the introduction of catechol groups under both nitrogen and air atmospheres. The hydrophobicity of the copolymer films could be healed after the surface was damaged by vacuum ultraviolet (VUV) irradiation. This copolymer was used to create superamphiphobic fabrics and halloysite nanotube (HNT)-based organic/inorganic hybrid coatings successfully. Wetting behaviors of the superamphiphobic fabrics and coatings both follow the Cassie-Baxter wetting model.
AB - The molecular aggregation structure and surface properties of a catechol-bearing fluoropolymer, P(FAC8-co-DOPAm), which was synthesized by conventional radical copolymerization of 2-(perfluorooctyl)ethyl acrylate (FAC8) and N-(3,4-dihydroxyphenethyl)acrylamide (DOPAm), and its application to the superamphiphobic surfaces are presented. The crystallinity of P(FAC8-co-DOPAm) was lower than that of poly[2-(perfluorooctyl)ethyl acrylate] (PFAC8). The perfluoroalkyl (Rf) groups were ordered on the surface with CF3 terminals exposed to air, and the Rf ordering was influenced by thermal history: the thermally annealed film exhibited higher Rf ordering than the unannealed one. The surface free energy was estimated to be γ= 7.32 mJ m-2 for both the unannealed and annealed films. Based on contact angle measurement, various interfacial structures of water and oils in accordance with the surface aggregation structure of Rf groups were proposed. Dewetting of the PFAC8 film at elevated temperature was suppressed by the introduction of catechol groups in the backbone. The degradation temperature of PFAC8 was improved significantly, and the evaporation of the low molar mass-polymer was inhibited by the introduction of catechol groups under both nitrogen and air atmospheres. The hydrophobicity of the copolymer films could be healed after the surface was damaged by vacuum ultraviolet (VUV) irradiation. This copolymer was used to create superamphiphobic fabrics and halloysite nanotube (HNT)-based organic/inorganic hybrid coatings successfully. Wetting behaviors of the superamphiphobic fabrics and coatings both follow the Cassie-Baxter wetting model.
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U2 - 10.1021/acsomega.0c00439
DO - 10.1021/acsomega.0c00439
M3 - Article
AN - SCOPUS:85082858536
VL - 5
SP - 8169
EP - 8180
JO - ACS Omega
JF - ACS Omega
SN - 2470-1343
IS - 14
ER -