| On the basis of PDMS( hydroxyl end-blocked dimethylsiloxane/107 Silicone rubber) organic-inorganic coatings have many excellent properties, such as good anticorrosion, hydrophobic property, resistance to low and high temperature,etc., many application and research based on it had become broad attention. However,because of its flexible polymer chains, which make it harder to use for the mechanical protection. Then with the progress of the society, the use requirement of the coating is not only stay on the mechanical properties and anticorrosion, more and more novel functional coatings are demanding to meet the industry and the society, such as the thermal conductivity of coating, the special fluorescence performance and so on.In order to solve those problems, this paper combines the latest research results of academia, according to the society demands for the development, our research contents and results are as follows:(1) Prepartion and characterization of the functional silicone PDMS/PMMA composite coatings. In this article, polydimethylsiloxane(PDMS) modified with siliane coupling agent,and then copolymerized with acrylate monomers by free radical polymerization to get the hybrid resins. Then a serious of hybrid resins were cured with tetraethoxysilane(TEOS) as the crosslinker. Due to the connection of covalent bond, the two components dispersed uniformly in the prepared hybrid resins and no cracks were observed from the cured hybrid coatings with optical microscope. With excellent mechanical properties, thermal stability,corrosion resistance and hydrophobic property, the prepared hybrid coatings can be applied into Heavy-Duty Chemical Industry.(2) Prepartion and characterization of the functional silicone PDMS/GO composite coatings. Due to the graphene oxide has similar to graphene excellent mechanics performance, thermal performance, etc., and the surface has activity groups, which has become one of hot topics in the research. However, due to the presence of the big conjugate electronic systems of the structure of the graphene oxide, which greatly reduces the activity of the surface functional groups of the graphene oxide. Therefore, in order to increase the reactivity of the surface functional groups of the graphene oxide, in this article, we will first acyl chlorination of the graphene oxide to improve the reaction activity of the group. Following on modifying with?-aminopropyltriethoxy silane(KH550)-mGO, and then grafted with PDMS, then the functional composite coating of PDMS/graphene oxide werecured by tetraethoxysilane(TEOS). mGO in the polymer coating can reach 4 wt % and well dispersed in polymer matrix, no reunion phenomenon. Compared with the pure PDMS polymer, The tensile strength of PDMS/GO was improved noticeably and its tensile strength increased nearly four times. when the amount of modification of graphene oxide to further improve, the tensile strength decreased mainly due to the conglomeration of the GO in the PDMS polymer matrix. Also the thermal conductivity property of PDMS/GO was improved noticeably with increasing the modified GO content.(3) Prepartion and characterization of the functional silicone PDMS/TPE composite coatings. Tetraphenylethylene(TPE) is one of the typical fluorescent molecules with aggregation induced luminescence, and it was found to be non-emissive in dilute solutions but became highly luminescent when its molecules were aggregated in concentrated solutions or cast in solid films. A facile approach for the synthesis of stimuli-responsive fluorescent elastomer was developed. TPE derivant was linked onto flexible polydimethylsiloxane(PDMS) polymer chains by covalent-bond with silane coupling agent,followed by its cross-linking condensation with tetraethylorthosilicate(TEOS) via sol-gel reaction to obtain the fluorescent elastomer. Due to the hampered intramolecular rotation of the aryl rotors of dye molecules with the intertwined polymer chains, the cured elastomers showed intense fluorescent emission. The elastomers exhibited stimuli-sensitive fluorescence against organic solvents and temperature, and its responsiveness was found to be reversible. |
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