Papers by Keyword: Low Surface Energy

Abstract: The research progress of the conventional surface treatment techniques applied in the heat transfer enhancement is reviewed. The research status and development trend of the effects of the low-energy surface prepared by the novel surface treatment techniques such as magnetron sputtering, ion implantation, chemical composite plating and molecular self-assembly on fouling prevention and heat transfer enhancement are also discussed.

Abstract: Preparation of hydrophobic and oleophobic ABS laminates by a template method or additives added method and hydrophobic and oleophobic mechanism of ABS were investigated. ABS laminates with micro/nanopores were fabricated by adding additives and dissolving the micro/nanomaterial on surface for forming pores, and with low surface energy were prepared by adding nanometer titanium dioxide (TiO₂) and silicon dioxide (SiO₂). The contact angle of ABS laminates with oil and water were tested by the contact angle meter. Surface microstructure of the ABS laminates were observed by SEM. The results show that the contact angle of the Al-ABS laminates treated by diluted hydrochloric acid with water is 117° increase 67°than the contact angle of ABS laminates without any treatment, which was since aluminum particles on the surface of ABS laminates are dissolved by diluted hydrochloric acid and form rough surface morphology with the surface micro/nanostructure.

Abstract: For the purpose of combining the properties of polymethylsiloxane and fluorinated compound, hexafluorobutyl mathacrylate (HFBMA) was grafted to polymethylhydrosiloxane (PMHS) by hydrosilylation reaction in the presence of Karstedt’s catalyst. The prepared polymethylsiloxane with pendant fluorocarbon side chains (PMHS-g-HFBMA) was characterized by FTIR, ¹H NMR and TGA. The results showed that the expected product was successfully formed. The surface property and solubility of the product were also investigated.

Abstract: Fluoro-polymer is of great importance as coating materials because of their excellent resistance to high temperature, chemicals and organic solvents. In the interest of researching low surface energy coating, a kind of copolymer was prepared by solution polymerization method, using methyl methacrylate, butyl acrylate, 2-hydroxyethyl acrylate and perfluoroalkyl ethyl acrylate whose length of fluorinated carbon chain was from 6 to12. Solid content, monomer conversion rate and viscosity of the copolymer were measured. Parallel experiments were separately carried out with different contents of initiator and fluorinated monomer. The results showed that the water contact angle of the film becomes bigger with the increase of the content of fluorinated monomer, with the biggest value in 108° when the content of fluorinated monomer content is 30 wt%, but only changing little after content of fluorinated monomer reaches up 15 wt%. The results indicated that the copolymer can offer the best property combination when the contents of fluorinated monomer and initiator were 15 wt% and 1.8 wt%.

Abstract: Atom transfer radical polymerization (ATRP) has been employed for the synthesis of a novel amphiphilic fluorinated triblock copolymer PEG-b-PS-b-PFHEM for anti-fouling coatings. The macroinitiator based on poly(ethylene oxide) monomethyl ether was used to prepare an amphiphilic diblock copolymer PEG-b-PSt-Br, which was then utilized to initiate the ATRP of fluorinated monomer perfluorohexylethyl acrylate (FHEA), resulting in an amphiphilic triblock copolymer. These copolymers were characterized by means of 1H NMR and GPC. The amphiphilic triblock copolymer surface composes of fluorinated and PEGylated blocks, and the fluorinated surface has critical surface energy, while the PEGylated surface is expected to have a relatively low interfacial energy when in contact with water. Microphase-separation of both blocks could take place and result in the reduction of protein adsorption and cell adhesion. The amphiphilic fluoropolymer has the potential application as excellent antifouling coatings and antifouling membranes.