以丙交酯/己内酯共聚物(LACL)为聚乳酸(PLA)/聚己内酯(PCL)共混物的增容剂,采用溶液共混法制备了PLA/PCL/LACL三元共混物;通过扫描电子显微镜、差示扫描量热仪研究了共混物的形貌和结晶性能.结果表明,加入5％(质量分数,下同)的LACL,分散相的尺寸明显减小;PCL能显著提高PLA分子链的结晶能力,使其结晶温度(Tp)降低,而LACL对PLA/PCL的增容作用,使PLA/PCL/LACL三元共混物中PLA的Tp进一步降低;通过Kissinger方程计算发现PCL和LACL的加入显著降低了PLA的结晶活化能.%Polylactide (PLA)/polycaprolactone (PCL) blends were prepared by using lactidecaprolactone copolymer (LACL) through a solution-blending method.Morphologies and crystallization behavior of the resulting blends were characterized by scanning electron microscopy and differential scanning calorimetry.The results indicated the dispersed phase exhibited a dramatic decrease in size with the addition of 5％ LACL.The crystalline capability of PLA molecules was greatly enhanced by PCL,thus resulting in a decrease in crystallization temperature.The crystallization temperature of PLA domain in PLA/PCL/LACL ternary blends was further reduced due to compatibilizing effect of LACL.The crystallization activation energies of PLA domain presented a decrease due to the presence of PCL and LACL on the basis of the calculation results derived from Kissinger's model.
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