Abstract
The fluorinated polyacrylate latex were successfully prepared with semi- continuous seeded emulsion polymerization of butyl acrylate (BA), methyl methacrylate (MMA) and hexafluorobutyl methacrylate (HFMA) which was initiated with potassium persulfate (KPS) initiator and emulsified with the novel mixed surfactants of sodium lauryl glutamate (SLG) and alkylphenol ethoxylates (OP-10). The structure of the resultant latex was confirmed by Fourier transform infrared spectroscopy (FTIR). The particle size of the latex was measured by Zetatrac dynamic light scattering detector. The film of latex was tested by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and contact angle (CA). The optimum conditions of preparing the novel fluorinated polyacrylate latex are optimized and the results are as follows: the amount of emulsifiers is 4.0%; mass ratio of SLG to OP-10 is 1:1, the amount of the initiator is 0.6%. The mass ratio of MMA to BA is 1:1 and the amount of HFMA is 7.0%. In this case, the conversion is high and the polymerization stability is good. In addition, the water resistance and thermal properties of the latex films were improved significantly in comparison with the film of the latex prepared without the fluorinated monomer.
Highlights
Emulsion polymerization has been widely used in producing environmental friendly copolymers and organic-inorganic hybrids.[1]
The fluorinated polyacrylate latex were successfully prepared with semi- continuous seeded emulsion polymerization of butyl acrylate (BA), methyl methacrylate (MMA) and hexafluorobutyl methacrylate (HFMA) which was initiated with potassium persulfate (KPS) initiator and emulsified with the novel mixed surfactants of sodium lauryl glutamate (SLG) and alkylphenol ethoxylates (OP10)
The film of latex was tested by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and contact angle (CA)
Summary
Emulsion polymerization has been widely used in producing environmental friendly copolymers and organic-inorganic hybrids.[1]. Fluorinated polymers present many excellent properties such as good adhesion to matrices, weather resistance and high thermal stability because of the low polarizability and the strong electronegativity of fluorine atom. The mixed surfactants of the anionic surfactant and nonionic surfactant are used to be the emulsifiers in the emulsion polymerization, which can produce synergistic effect and improve emulsion stability and adsorption fastness of the surfactnat on the latex particle.[9] At present, application of amino acids surfactants in preparing the fluorinated polyacrylate latex has not been reported in the open literatures. The influence of the amount of hexafluorobutyl methacrylate (HFMA) on the properties of the copolymer is investigated in detail
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