TFEMA在超临界CO_2中的聚合

Polymerization of TFEMA in supercritical carbon dioxide

以超临界CO2为反应介质进行了甲基丙烯酸三氟乙酯(TFEMA)的聚合,研究了单体浓度、引发剂用量、反应温度对聚合的影响,并且以甲基丙烯酸十二氟庚酯(MBFA-12)为共聚单体与TFEMA共聚合,研究了聚合物的结构与聚合物膜的表面性能。结果表明:单体浓度、引发剂用量及反应温度都是影响TFEMA均聚合的因素;引入MBFA-12共聚单体可以改善聚合物在超临界CO2中的溶解性,从而可使聚合物的数均分子量由22 316增加到39 985,相对分子质量分布由1.93降至1.49,同时使共聚物的玻璃化转变温度在一定程度上降低;共聚物膜的表面性能随着共聚物中MBFA-12含量的增加而提高。

The polymerization of 2,2,2-trifluoroethyl methacrylate（TFEMA） in supercritical carbon dioxide was performed, and the effects of the monomer concentration, initiator dosage and reaction temperature on the polymerization was explored. The copolymerization of TFEMA with dodecafluoroheptyl methacrylate （MBFA-12） as comonomer was carried out. The structure of the copolymer obtained and surface properties of the films made of the copolymer were studied. The results indicate that the monomer concentration, initiator dosage and reaction temperature are the factors influencing the homopolymerization of TFEMA. The solubility of the copolymer in su-percritical carbon dioxide can be improved by copolymerizing TFEMA with MBFA-12. Consequently, the num-ber average molecular mass of the copolymer increases from 22 316 to 39 985, and the relative molecular mass distribution decreases from 1.93 to 1.49. In addition, the glass transition temperature of the copolymer decreases to a certain extent. The surface properties of the copolymer films are improved with the increase in the monomer MBFA-12 content of the copolymer.