Effect of different molecular architectured POSS-fluoropolymers on their self-assembled hydrophobic coatings
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Effect of different molecular architectured POSS-fluoropolymers on their self-assembled hydrophobic coatings Xiaoqin Ma 1 & Ling He 1 & Shengying Huang 1 & Youshen Wu 1 & Aizhao Pan 1 & Junyan Liang 1 Received: 25 May 2020 / Revised: 24 August 2020 / Accepted: 25 August 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract A total of 1/2/4/6-armed molecular architectured polyhedral oligomeric silsesquioxane (POSS) fluoropolymers were synthesized via atom transfer radical polymerization (ATRP) by linear (L), dicephalus (D), four-arm (T), and six-arm (S) initiators initiating same content of methyl methacrylate (MMA), methacrylate POSS (MA-POSS), and dodecafluoroheptyl methacrylate (DFHM). The obtained L/D/T/S-(PMMA-b-PMAPOSS-b-PDFHM)1/2/4/6 had increased molecular weight with arm increase. Driven by the stereo-hindrance and curvature effects of segments in tetrahydrofuran (THF), they assembled into the decreased spherical coreshell micelles (250–100 nm) with arm increase as PMA-POSS/PDFHM core and PMMA shell. Because of easy surface migration of fluorine-containing groups in small micelles, the casted film by S-(PMMA-b-PMAPOSS-b-PDFHM)6 performed the fluorine-rich (46.44%) and rough (5.41 nm) surface, and therefore with the hydrophobic (112°) and low water adsorption surface (1522 ng/cm2). Also, POSS-fluoropolymers obtained the enhanced thermostability with arm increase. It is believed that this research will provide a bright view for design and application of POSS-fluoropolymers. Keywords POSS-fluoropolymer . Topologic structures . Assembled coatings . Hydrophobic surface . Thermal stability
Introduction Polyhedral oligomeric silsesquioxane (POSS) with a welldefined organic/inorganic structure as a general formula of (RSiO1.5)n has attracted considerable attention due to its unique cage-like structured Si-O-Si skeleton surrounded by organic groups, polyhedral molecular structure, and physiochemical properties [1–3]. Silica cage in POSS exhibits excellent mechanical and thermal stability [4]; the organic groups around silica cage are able to produce POSS-containing polymeric hybrids by chemically introducing POSS into copolymers at the molecular level endowing the hybrids with high mechanical/thermal properties and hydrophobicity for highperformance applications [5]. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00396-020-04739-9) contains supplementary material, which is available to authorized users. * Ling He [email protected] 1
Department of Chemistry, School of Chemistry, Xi’an Jiaotong University, Xianning West Road, 28, Xi’an 710049, Shaanxi Province, China
On the other hand, in order to obtain a special coating with low surface energy, the fluorinated segment is normally introduced for chemical and weather resistance [6] and high hydrophobicity [7–11] from the typical self-migration of fluorinated segment onto the film surface [12–14]. Therefore, it is reported that the POSS-fluoropolymers have wide applica
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