超临界CO_2中的丙烯酸聚合反应

POLYMERIZATION OF ACRYLIC ACID IN SUPERCRITICAL CARBON DIOXIDE

化学工业中的各种有机溶剂对环境造成了严重的污染，因此探索无毒无污染的溶剂体系意义重大．近年来，以超临界ＣＯ２作为有机反应及聚合反应介质的研究得到了发展［１］．超临界ＣＯ２作为聚合反应介质有许多优点，无毒、价廉、传质和传热速度快、由于惰性而不会引发链转...

Precipitation polymerization of acrylic acid in supercritical CO 2 is studied. The effect of the temperature, the pressure of CO 2, the concentration of the monomer and the initiator ae explored. It shows that the decrease of the concentration of the monomer, the increase of the pressure of CO 2, the decrease of the temperature of the increase of the concentration of the initiator will all decrease the molecular weight of the product. The scanning electron micrographs indicate that the water soluble polyacrylic acid powder obtained from this experiment is formed by primary particles of about 1～2 μm size. In addition, the pressure increases with the increasing of the yield, it is speculated to be due to the separation of phases during polymerization.