A novel polylactide/poly(butylene succinate) composite via cross-linking with methylene diphenyl diisocyanate was used. The methylene diphenyl diisocyanate (MDI) was to couple with end hydroxyl of polylactide and poly(butylene succinate) by a torque rheometer and the samples were compression molded into plate successfully. A series of composites was studied with various amounts of poly(butylene succinate) (PBS) from 0 to 40 wt%. Tensile test results demonstrated that the elongation at break of the MDI-based PLA/PBS composites increased greatly compared with PLA/PBS, PLA and PBS. Fourier transform infrared spectroscopy (FTIR) tests indicated the MDI-based composite showed a new urethane bond among different components. Melting Flow Rate (MFR) in PLA/PBS composites decreased with increasing PBS content.

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This article describes our study of crystallization behavior of nano-CaCO 3 -filled polypropylene under nonisothermal from the melt by differential scanning calorimetry (DSC). Morphology observation indicated with increasing CaCO 3 content the aggregates increased. Nano-CaCO 3 acted as nucleating site during nonisothermal crystallization in all iPP/nano-CaCO 3 composites. For nonisothermal crystallization kinetic studies, the result indicated that the Jeziorny and Ozawa approach cannot adequately describe the nonisothermal crystallization kinetic of iPP composite. In addition, Mo equation was employed to describe the nonisothermal crystallization kinetic process with satisfied results. Dynamic mechanical analysis indicated with increasing CaCO 3 content the glass transition decreased slightly.