反应详情

Polymerization was carried out by means of the continuous polymerization device as shown in FIGURE. First, into a polymerization tank 1 of 350 ml volume equipped with a stirrer and a reflux condenser, 135 g of phosphotungstic acid with a coordinated water molecules number of 3.3 (H3PW12O40.3.3H2O) was charged and 270 g of THF with a water content of 200 ppm was added, followed by stirring. The polymerization tank was set at a temperature of 60° C. and THF containing water of 0.4 wt. % was fed at a rate of 60 g/hour. The polymerization tank mixture was circulated between the tank and the phase separation tank 2, and the upper layer separated was withdrawn at a rate of 60 g/hour. From the upper layer, THF was removed by distillation, resulting to provide PTMG. After continuous running for 260 hours, 2.0 Kg of a PTMG with a number-average molecular weight of 1750 was obtained.

1. customPolymerization
2. customFirst, into a polymerization tank 1 of 350 ml volume equipped with a stirrer and a reflux condenser
3. customthe phase separation tank 2
4. customthe upper layer separated
5. customwas withdrawn at a rate of 60 g/hour
6. customFrom the upper layer, THF was removed by distillation
7. customresulting