Synthesis of self-crosslinking fluorinated acrylate copolymer emulsion

The self-crosslinking fluorinated acrylate copolymer emulsion was synthesized by seed emulsion polymerization,with methyl methacrylate(MMA),butyl acrylate(BA)as main monomers and hexafluorobutyl methacrylate(HFMA)as fluorine-containing monomer,N-hydroxymethylacryiamide(NMA)as crosslinking monomer.The effects of such factors as HFMA,NMA,mixing emulsifier(SDS+ OP-10),initiator(KPS),polymerization temperature,polymerization time and stirring rate,on the total conversion of monomer and the emulsion stability were investigated.The results showed that the highest overall conversion of monomer and the lowest agglomeration were achieved when m(MMA)∶m(BA)=1∶1 and the amounts of HFMA,NMA,SDS+OP-10 and KPS were 7%,3%,3%and 0.5%of total monomers,respectively,and that emulsion polymerization could be stably carried out at 75 ℃ for 4h with 210 r/min stirring rate.Moreover,the copolymer films were characterized with Fourier transform infrared spectrum(FT-IR)t,hermogavimetry(TG)and differential scanning calorimetry(DSC.) The results show that HFMA was effectively involved in the copolymerization and that the film thermal stability was improved greatly.