Abstract:

A kind of fluorinated self-crosslinking vinyl acetate polymer was synthesized by soap-free emulsion polymerization.The distribution of the fluorinated group on the surface of the polymer membrane was investigated with electron spectroscopy for chemical analysis (ESCA).The contact angles of the membrane with water and ethylene glycol were measured.The results showed that during the process of membrane-forming by casting, the fluorinated group stretched on the interface of air and polymer, which could protect the inner molecule of the polymer effectively,and the membranes were provided with excellent corrosion resistance and weather resistance.As fluorinated group content was 5.73%(mass), membrane adhesive force grade and flexibility could reach the 1st level, gloss 98.2%, hardness 2H, resistance to shock 50 cm and the surface free energy decreased from 0.3751 mN·cm^-1 to 0.1652 mN·cm^-1.The membrane gloss retention ratio kept above 90% after 1600 h artificial aging. Furthermore, no changes took part in the membranes after being corroded with wet salt and chemical for 360 h.