CTFE与VAc共聚物的制备

Synthesis of P(CTFE-co-VAc) copolymer

在超临界CO2中制备三氟氯乙烯(CTFE)与乙酸乙烯酯(VAc)共聚物P(CTFE-co-VAc),考察了单体配比对聚合反应、产物结构及性能的影响,研究了共聚物的表面性能及其溶液黏度。控制单体配比可得到不同结构、不同氟含量的共聚物。当m(VAc)/m(CTFE)小于4∶16时,产物中y(CTFE)恒定在50%左右;氟含量是影响共聚物表面性能的关键因素,共聚物中CTFE单元的比例增加,则产物中氟含量增大,产物对溶剂的接触角变大,当产物中w(F)为29.16%时,聚合物膜的表面能最小,为0.028 J/m2;聚合物溶液黏度随共聚物中VAc结构单元比例增加而增大。

The copolymers of chlorotrifluoroethylene （CTFE） and vinyl acetate （VAc） were prepared in supercritical carbon dioxide. The effect of the monomer ratio on the polymerization and the structure and properties of the copolymers was explored, and the surface property and solution viscosity of the copolymers was studied. The copolymers with different structures and fluorine contents could be obtained by controlling the monomer ratio. The CTFE segments in the copolymers were kept constant at about 50% in molar content when the mass ratio of VAe to CTFE was less than 4 ： 16. The fluorine content of the copolymers was the critical factor influencing the surface property of the copolymers. If the CTFE segments content in the copolymer rose, then the fluorine content in the product increased and the contact angle between the copolymer and the solvent became larger. The copolymers＇ film had the lowest surface energy of 0.028 J/m2 when the mass content of fluorine of the product was 29.16%. The viscosity of the copolymer solution increased with the augmentation of the VAc segments content.