杂多酸引发四氢呋喃聚合反应

ETHYLENE OXIDE PROMOTED POLYMERIZATION OF TETRAHYDROFURAN INITIATED WITH LOW CONCENTRATION OF HETEROPOLYACID

八十年代中、后期发现，杂多酸（ＨＰＡ）是阳离子聚合反应的良好引发剂［１，２］．ＨＰＡ是一类酸强度比浓硫酸还高的质子酸［３］，不仅具有易于制备，结构稳定，腐蚀性低，易溶于大多数有机溶剂的特点，更为重要的是，ＨＰＡ可以回收和重复使用．因此，ＨＰＡ作为一类...

Tetrahydrofuran was polymerized using a heteropolyacid,H 3PW 12 O 40 (PW 12 ) in low concentration (molar ratio of PW 12 /THF2 5×10 -3 ) as the initiator and ethylene oxide as the polymerization promoter,which effectively increased the rate and conversion of the polymerization.Water was used to control the molecular weight of the product.The polymerization proceeded well even when the molar ratio of H 2O/PW 12 reaches 30.The yield reached 50%～60% per cycle and the average molecular weight could be controlled around 2000.The products were found to be polyether glycol with hydroxyl groups at both ends.The melting point was lower by ～10℃ as compared with polytetramethylene ether glycol having the same molecular weight.The concentration of active species maintained unchanged throughout the polymerization,which indicated the absence of chain termination.