Preparation And Characterization Of Two Kinds Of Biodegradable Polymer Nanocomposites

With the increasing of the environmental concerns about waste pollution, the research of biodegradable polymer materials are attracting considerable attention, both from academic and industrial research interests. Poly(propylene carbonate)(PPC) and poly(butyleneadipate-co-terephthalate)(PBAT) are two biodegradable polymers with a potentially wide range of applications, but the poor thermal stability and low mechanical property of PPC and the higher viscosity and poor processability have limited their applications. In the experiment, based on the mSp, OMMT and nano-SiO2, the PPC/mSp nanocomposites, PPC/OMMT nanocomposites and PBAT/SiO2nanocomposites were prepared. The morphology, thermal and mechanical properties were characterized. Main contents and conclusions are as follows:1) PPC/mSp nanocomposites were prepared via a solution-based processing method, and were investigated by analytic instruments. Morphological analysis confirmed that MTMS has been grafted on the sepiolite structure, and the homogeneous dispersion of mSp in the PPC matrix whose structure remains amorphous. The nanoscale dispersion of mSp significantly enhanced the mechanical properties and thermal stability. The thermal motion and degradation of the polymer occur at higher temperature in the presence of mSp because of the strong interfacial adhesion between the two components. The results indicate that the mSp nanofibers are very effective inorganic fillers for increasing the properties of PPC.2) PBAT/SiO2nanocomposites with using two nano-SiO2(JY-05and JY-10) were prepared by melt blending method. Morphological analysis showed the particle size of JY-05is smaller than JY-10, and not agglomerated. Thermal and mechanical analysis confirmed that two nano-SiO2were increasing the properties of PBAT, but the properties of JY-05/PBAT nanocomposites with nano-SiO2content were much better than that of JY-10/PBAT.3) The Na-MMT was modified by organic inter calted with long chain alkanes containing nitrogen and phosphorus, and PPC/OMMT nanocomposites were prepared, which were characterized by FT-IR, XRD and TGA. The results showed that the interlayer spacing of OMMT was expanded from1.12nm to1.22nm by replacing the the adsorption water of MMT with using surfactant, and changed the surface properties of OMMT from hydrophilic to lipophilic. The settlement experiment indicated that the OMMT was commendably dispersed in styrene, toluene and chloroform. Thermal analysis confirmed that the OMMT had the high thermal stability, which wassignificantly enhanced the thermal stability of PPC.