Abstract
Fluorosilicone polymer is a new type of structure of the fluorine silicon block polymer. Because it combines the excellent properties of organic silicone and organic fluorine compounds, it has a wide range of uses and becomes a hot issue in the field of materials. In the paper, A series of novel poly(2,2,3,4,4,4-hexafluorobutyl methacrylate)-block-poly(dimethylsiloxane)-block-poly(2,2,3,4,4,4-hexafluorobutyl methacrylate)s (PHFBMA-b-PDMS-b-PHFBMA) were synthesized by atom transfer radical polymerization (ATRP) with different molecular weight prepared polydimethylsiloxane macroinitiator as raw materials. The effects of the fluorine and silicone content on the hydrophobic and oleophobic properties of prepared triblock copolymers were also investigated. The structure and composition of the copolymers were analyzed and identified by infrared spectroscopy (IR) and nuclear magnetic resonance (NMR). The average molecular weight and molecular weight distribution of the prepared PHFBMA-b-PDMS-b-PHFBMA were evaluated by gel permeation chromatography (GPC). The surface energy of the triblock copolymers was calculated from the contact angle reaches as low as 10.43 mN/m through the Owens-Wendt-Rabel-Kaelble method, with the fluorine content of triblock polymer was 19.0 wt%. Atomic force microscopy (AFM), differential scanning calorimetry (DSC) and X-ray photoelectron spectroscopy (XPS) indicated that there were Obvious nanoscopically microphase separation on the surface of the prepared triblock copolymers and the fluoride contents in the block polymer of the fluorine silicon block were more likely to migrate to the surface.
Highlights
The fluorinated acrylate/polydimethyl siloxane block copolymer (PDMS-b-PF) is a new type of structure of the fluorine silicon block polymer
The result showed that the surface tension could be reduced, the hydrophobicity and oilphobicity could be improved effectively even if a small amount of block polymer was added to polystyrene
A series of bishydroxypropyl terminated polysiloxane (BHTPS) with different hydroxyl content were produced by Shaanxi Provincial Research and Design Institute of Petroleum and Chemical Industry. αchloroisobutyryl chloride (98%) was obtained from SynAsst Chemical. 2,2,3,4,4,4-hexafluorobutyl methacrylate (HFBMA, 98%) purchased from Lancaster was washed with5% aqueous NaOH solution to remove the inhibitor
Summary
The fluorinated acrylate/polydimethyl siloxane block copolymer (PDMS-b-PF) is a new type of structure of the fluorine silicon block polymer. The microphase separation is an important feature of the fluorosilicone block copolymers which is one of the hot topics in the field of organic fluorine and silicon materials in recent years [7,8,9], and itmakes the function of the polymer greatly improved and the application domain widened [10, 11]. The result showed that the surface tension could be reduced, the hydrophobicity and oilphobicity could be improved effectively even if a small amount of block polymer was added to polystyrene. 106 Xitao Cheng et al.: Preparation of Fluorosilicone Triblock Copolymers and Microphase Separation Behavior on Surfaces [13] found that the contact angle increased with the polysiloxane segment content orthe molecular weight increased through evaluation of fluorinated silicone block polymer's surface properties. The surface tension and the microphase separation of the membrane surface of the polymers were investigated
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