This paper presented the synthesis of fluorosilicone copolymer latex with dodecafluoroheptyl methacrylate(G04), vinyl triethoxysilane(DB-151), methyl methacrylate(MMA) acrylic acid(AA), butyl acrylate(BA) by emulsion copolymerization and characterized by FTIR. The physical properties are also measured by particle sizes and distributions, water absorption, pencil hardness, circle adhesion method, etc. The obtained fluorosilicone latex showed us excellent comprehensive performance compared to the common acrylate latex.
This study is to report the synthesis of polyacrylate-siloxane latex with vinyl triethoxysilane(DB-151), methyl methacrylate(MMA) acrylic acid(AA), butyl acrylate(BA) by emulsion copolymerization and characterized by FTIR. The physical properties are also analysized by water absorption, pencil hardness, circle adhesion method, etc.. The polymerization factors for emulsion had been discussed in several aspects. The results showed that the optimal conditions for synthesizing silicone-acrylate emulsion were of DB -151content of 6%~8%, emulsifier OP-10/SDS/ DNS-458 ratio:2/1/1, in stirring rate 450 r/min in the period of disperse and emulsification, stirring rate 200 r/min in the period of synthesis, with reaction temperature 75°C.
The novel biodegradable poly(ε-caprolactone)/TiO2nanocomposite materials were successfully prepared via in situ in the presence of modified-TiO2initiator and Sn(Oct)2 catalyst. The relationships between morphology, molecular weight, and properties were investigated by means of SEM, TGA, DSC and GPC. A tendency of the nanoparticles to form aggregates was observed, especially at higher fillers contents. The molecular weight of PCL matrix was dependent on the amount of the TiO2fillers
Polyureas series were synthesized via two-step solution process by reaction of sophorone diisocyanate (IPDI), amine terminated polyether (Jeffamine D-2000) with different chain extenders including dimethyl-thiotoluene diamine (E300), 1,6-hexamethylene diamine (HDA) and 4,4-diamino cyclohexylmethane (H12MDA). The structure of polyureas was characterized and thermal properties were measured by TGA and DSC. The influence of diamine chain extenders on gel time of polyurea was investigated. The gel time was prolonged to 753s using the E-300 as the chain extenders.
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