聚己内酯/淀粉共混材料非等温结晶动力学的研究

以异氰酸酯（MDI）作为相容剂，采用共混挤出技术制备不同百分比含量的PCL与淀粉的共混产物（SPCL）作为研究对象，用X射线衍射研究SPCL共混材料的结晶性质, 表明随着淀粉含量增加，SPCL的结晶程度降低。用DSC法研究其非等温结晶行为，对所得数据分别用Ozawa法和Mo法进行处理。结果表明，淀粉在SPCL中起到成核剂作用，加快了PCL的结晶速度，但对PCL的结晶程度起到抑制作用。建模结果表明Ozawa法适合于处理纯PCL的非等温结晶行为，但不适合于处理SPCL共混物，而Mo法对PCL和SPCL共混物均适合。

Nonisothermal Crystallization Kinetics of Polycaprolactone /Starch Blends

Starch/polycaprolactone (SPCL) blends were prepared by blending extruder with MDI (methylenediphenyl diisocyanate) as a compatibilizer. The crystallization was detected by X-ray diffractometer (XRD). The result showed that the crystallization of PCL was suppressed by blending starch. The nonisothermal crystallization kinetics of PCL and SPCL blends were investigated by differential scanning calorimetry (DSC). The Ozawa and Mo methods were employed to analyze the DSC data. The results showed that starch played a role as a nucleating agent for non-isothermal crystallization of PCL. It could increase the non-isothermal crystallization rate of PCL, but destroy the crystal structure of PCL and the crystal capability of SPCL blends were decreased. Crystallization kinetics analysis showed that the Ozawa model could well describe the non-isothermal crystallization of PCL, but failed to describe that of SPCL. However, the method developed by Mo et al., which combined the theories of Avrami and Ozawa, was adequate in describing the nonisothermal crystallization of PCL and SPCL.