可降解材料聚碳酸亚丙酯和聚乳酸的溶度参数与相容性

Study on Degradable Materials Poly(Propylene Carbonate)and Poly(Lactic Acid):Solubility Parameters and Compatibility

采用基团贡献法求出了聚碳酸亚丙酯(PPC)和聚乳酸(PLA)的一维溶度参数和Hansen三维溶度参数理论值,并通过溶解试验获得了PPC和PLA的三维溶度参数值,结合Teas图分析了聚合物与溶剂之间的溶度参数距离(Ri)和Flory-Huggins相互作用参数(χ_(AB)),预测和分析了PPC和PLA的相容性。结果表明,PPC和PLA的一维溶度参数理论值分别为20.37(J/cm^3)^(1/2)、19.97(J/cm^3)^(1/2);PPC的Hansen三维溶度参数(δd、δp、δh)和总溶度参数理论值(δ)分别为14.68(J/cm^3)^(1/2)、7.37(J/cm^3)^(1/2)、10.79(J/cm^3)^(1/2)和19.65 (J/cm^3)^(1/2),PLA的分别为15.45 (J/cm^3)^(1/2)、8.51 (J/cm^3)^(1/2)、11.02 (J/cm^3)^(1/2)和20.80 (J/cm^3)^(1/2);试验法得出PPC的δd、δp、δh、δ分别为16.94(J/cm^3)^(1/2)、7.05(J/cm^3)^(1/2)、6.75(J/cm^3)^(1/2)、19.56(J/cm^3)^(1/2),PLA的则分别为16.83(J/cm^3)^(1/2)、6.40(J/cm^3)^(1/2)、6.70(J/cm^3)^(1/2)、19.21(J/cm^3)^(1/2),且在Teas图中,所有良溶剂位于一定的溶解区域内,不良溶剂位于区域外,聚合物与良溶剂的Ri小于与不良溶剂的Ri,聚合物与良溶剂的χ_(AB)小于0.5,与不良溶剂的χ_(AB)大于0.5,表明试验结果可信;通过理论计算和试验法求出PPC和PLA都具有相近的溶度参数值,且溶度参数差值的绝对值(Δ)位于0.077～1.300(J/cm^3)^(1/2)之间,表明两者之间为部分相容。

The theoretical values of one-dimensional solubility parameters and three-dimensional Hansen solubility parameters of poly（propylene carbonate） （PPC） and poly（lactic acid） （PLA） were calculated according to the group contribution method. The practical three-dimensional solubility parameters of PLA and PPC were derived by dissolution experiments. Solubility parameter distance （ R i） and Flory-Huggins interaction parameters （ χ AB ） between solvents and polymers were analyzed by Teas diagram, meanwhile the compatibility between PPC and PLA was predicted and analyzed. The results showed that the values of one-dimensional solubility parameters for PPC and PLA were 20.37 （J/cm^3）^1/2 and 19.97 （J/cm^3）^1/2 respectively, and the values of Hansen three- dimensional solubility parameters and total solubility parameters （ δ d、 δ p、 δ h、 δ ） for PPC and PLA were 14.68 （J/cm^3）^1/2 ,7.37 （J/cm^3）^1/2 ,10.79 （J/cm^3）^1/2 , 19.65 （J/cm^3）^1/2 and 15.45 （J/cm^3）^1/2 ,8.51 （J/cm^3）^1/2 ,11.02 （J/cm^3）^1/2 ,20.80 （J/cm^3）^1/2 respectively. Moreover, it could be find, from the dissolution experiment, that the δ d、 δ p、 δ h、 δ values of PPC and PLA were 16.94 （J/cm^3）^1/2 ,7.05 （J/cm^3）^1/2 ,6.75 （J/cm^3）^1/2 , 19.56 （J/cm^3）^1/2 and 16.83 （J/cm^3）^1/2 ,6.40 （J/cm^3）^1/2 ,6.70 （J/cm^3）^1/2 ,19.21 （J/cm^3）^1/2 , respectively. In the Teas plot, all the good solvents were located in a certain dissolution zone, while the poor solvents were located outside the zone. The R i between polymers and good solvents was lower than the R i of poor solvents. Moreover, the χ AB between the polymers and good solvents was lower than 0.5, however χ AB of poor solvents was higher than 0.5, which proved the results were credible. The solubility parameters of PPC and PLA derived from theoretical calculations and experimental methods were similar, and the absolute value of solubility parameters difference （ Δ ） lay in 0.077—1.300 （J/cm^3）^1/2 , indicating the partial compatibility of PPC and PLA.