氯化稀土催化ε-己内酯开环聚合

Ring-opening Polymerization of ε-Caprolactone Catalyzed by Rare Earth Chloride

Ring-opening polymerization of ε-caprolactone catalyzed by rare earth chloride dissolved in N,N-dimethylformamide and adding a small amount of propylene oxide was studied.The optimum conditions for the ring-opening polymerization of CL are as follows.In the bulk polymerization: n（DMF）/n（LaCl3）=10,n（PO）/n（LaCl3）=20,aging temperature: 30 ℃,aging time: 1 h,c（CL）=7.91×10-3 mol/L,c（LaCl3）=1.58×10-5 mol/L,the polymerization carried out at 30 ℃ for 1 h,yield=83.3%,Mν=1.93×104.In the solution polymerization: n（DMF）/n（LaCl3）=10,n（PO）/n（LaCl3）=20,aging temperature: 30 ℃,aging time: 1 h,toluene as the solvent,c（CL）=4.22×10-3 mol/L,c（LaCl3）=8.43×10-6 mol/L,the polymerization was carried out at 30 ℃ for 2 h,yield=62.9%,Mν=1.21×104.

Ring-opening polymerization of ε-caprolactone catalyzed by rare earth chloride dissolved in N, Ndimethylformamide and adding a small amount of propylene oxide was studied. The optimum conditions for the ring-opening polymerization of CL are as follows. In the bulk polymerization： n（ DMF）/n（ LaCl3 ） = 10, n （PO）/n （ LaCl3 ） = 20, aging temperature ： 30 ℃, aging time ： 1 h, c （EL） = 7.91 × 10^ - 3 mol/L, c （ LaCl3 ） = 1.58× 10^-5 mol/L, the polymerization carried out at 30 ℃ for 1 h, yield = 83.3% , M^-v = 1.93 × 10^4. In the solution polymerization ： n （DMF）/n （ LaCl3 ） = 10, n （PO）/n （ LaCl3 ） = 20, aging temperature ： 30 ℃, aging time： 1 h, toluene as the solvent, c（CL） = 4.22 × 10^-3 mol/L, c（ LaCl3 ） = 8.43 × 10^ -6 mol/L, the polymerization was carried out at 30 ℃ for 2 h, yield =62.9% , M^v = 1.21 × 10^4.