Structure and mechanical properties of β-nucleated polypropylene/montmorillonite nanocomposites
In this paper,β-nucleated polypropylene(β-PP)/organic montmorillonite(OMMT)nanocomposites were prepared by twin-screw extruder.The microstructure and morphology of the composites were analyzed by FTIR,XRD and SEM.The effects of OMMT,β-nucleating agent(β-NA)and compatibilizer on the impact strength and flexural strength of the composites were investigated.And comparatively studying the standard BP neural network model and LM-BP neural network model for prediction ability of mechanical properties.The results showed that the compatibilizer forms a strong interaction at the surface of OMMT,which improves the compatibility of the composite system,and the clay sheets with intercalated structures are dispersed in β-PP matrix.The amount of OMMT,β-NA and compatibilizer all has a certain effect on the mechanical properties of composites.Among them,the impact strength of composite with 30%compatibilizer is about 4 times when which is not added,while the tensile strength is only reduced by 28.39%.In addition,the LM-BP neural network model has fast convergence rate and high prediction precision compared with the standard BP neural network model.This study provides reference for optimizing the preparation and the mechanical properties prediction of PP-based nanocomposites.
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