反应详情

温度

80 °C

A 0.5% of aqueous solution of 88% hydrolyzed polyvinylalcohol (90 ml) was introduced into a 100 ml reactor and allowed to stand under a nitrogen atmosphere for 15 min. The monomer phase containing poly(ethylene glycol)methyl ether methacrylate (2.77 g), PLA cross-linker (0.7 g) and 1 wt % AIBN solubilized in 4.3 ml of xylene was degassed by bubbling nitrogen through the solution for 15 min. The monomer phase was added to the aqueous phase at 50° C. and agitated by means of a propeller type stirrer at an appropriate velocity so as to obtain monomer droplets of desired diameter. The temperature was increased to 80° C. and stirred for 5 h. The mixture was filtered hot and washed with water and acetone. Then, beads were freeze dry. Size 390±100 μm.

1. customwas degassed
2. customby bubbling nitrogen through the solution for 15 min
3. additionThe monomer phase was added to the aqueous phase at 50° C.
4. customto obtain monomer droplets of desired diameter
5. stirringstirred for 5 h
6. filtrationThe mixture was filtered hot
7. washwashed with water and acetone
8. customdry