摘要
A convenient one-pot terpolymerization of CO2, propylene oxide （PO）, and L-lactide （L-LA） in short polymerization time （10 h or shorter） to afford poly（propylene carbonate-lactide） with excellent mechanical property and thermal stability using Y（CCl3COO）3-ZnEtz-glycerin rare-earth ternary catalyst is reported. The yield of the co- polymerization was between 69.7 and 111.7 g/（g Zn）, corresponding to L-LA/PO molar feed ratio varying from 0 to 0.1, and the number average molecular weight was between 5.5×10^4 and 11.9 × 10^4. The L-LA content in the ter- polymer increased from 1.1% to 34.7% when L-LA/PO molar feed ratio changed from 0.01 to 0.1. Introducing L-LA as the third comonomer could significantly improve the mechanical strength and thermal stability of PPC. For the terpolymer obtained from L-LA/PO molar feed ratio of 1：50, the elongation at break reached 40.5%, which is 3 times of that of pure PPC, and the thermal decomposition temperature increased by 32℃ compared with pure PPC.
A convenient one-pot terpolymerization of CO2, propylene oxide （PO）, and L-lactide （L-LA） in short polymerization time （10 h or shorter） to afford poly（propylene carbonate-lactide） with excellent mechanical property and thermal stability using Y（CCl3COO）3-ZnEtz-glycerin rare-earth ternary catalyst is reported. The yield of the co- polymerization was between 69.7 and 111.7 g/（g Zn）, corresponding to L-LA/PO molar feed ratio varying from 0 to 0.1, and the number average molecular weight was between 5.5×10^4 and 11.9 × 10^4. The L-LA content in the ter- polymer increased from 1.1% to 34.7% when L-LA/PO molar feed ratio changed from 0.01 to 0.1. Introducing L-LA as the third comonomer could significantly improve the mechanical strength and thermal stability of PPC. For the terpolymer obtained from L-LA/PO molar feed ratio of 1：50, the elongation at break reached 40.5%, which is 3 times of that of pure PPC, and the thermal decomposition temperature increased by 32℃ compared with pure PPC.
