| Polyamide 6(PA6)is one of the engineering plastics with excellent performance,which is widely used in many fields.However,the inherent brittleness of PA6 has greatly hindered its applications in certain fields.Blending with elastomers is a common way to obtain super-toughened nylon materials,and high-quality,cheap,and easy-to-process elastomer modifiers have always been the goal of the polymer industry.Plasticized poly(vinyl butyral)(PVB)film is widely used in the fields of safety glass interlayer materials and solar photovoltaic module packaging materials.A large volume of residue of PVB film(r-PVB)is generated in the production and use of these products,which has not yet been widely destined for recycling.r-PVB still possesses excellent impact resistance and processing performance.The recycling of r-PVB is not only beneficial to environment,but also gains economic benefits.In this paper,PA6 was toughened with r-PVB as a toughening agent and maleic anhydride-grafted ethylene-octene copolymer(POE-g-MA)as a compatibilizer.The different proportions of r-PVB and POE-g-MA were reactively blended to prepare masterbatches,and then PA6 and the masterbatches were reactively extruded to prepare super-toughened PA6 blends.The morphology and properties of the PA6 blends were characterized through various analysis methods,such as infrared spectroscopy(FTIR),contact angle,scanning electron microscope(SEM),atomic force microscope(AFM),thermal analysis(DSC),dynamic rheology and mechanical property test.The influence of masterbatch ratio and content on the mechanical properties of PA6 blends and the relationship between morphological structure and properties were investigated.Based on this research,the modification effect of masterbatches on various PA materials was investigated.The main research contents and conclusions are as follows:(1)Based on the masterbatch method,PA6/r-PVB/POE-g-MA blends with different r-PVB and POE-g-MA content were prepared,which overcame the problem of the reactive activity that the acid anhydride groups in the POE-g-MA reacted with the amine groups in the PA6 prior to the hydroxyl groups in the r-PVB.This way could significantly improve the compatibility between PA6 and r-PVB.(2)With the increase of POE-g-MA content,the degree of reaction between POE-g-MA and r-PVB,PA6 and the masterbatch was enhanced.Also,under the influence of interfacial tension and viscosity ratio between the components,the multicore structure was formed in the PA6/r-PVB/POE-g-MA blends.When the ratio of PA6/r-PVB/POE-g-MA blend was 70/20/10,the impact strength of the blend was the highest,136.7 k J/m~2,24 times higher than that of PA6.The strong interfacial adhesion between the components and multi-core structure led to large deformation of the dispersed phase and induced shear bands in the matrix,which was the main toughening mechanism of PA6/r-PVB/POE-g-MA blends.The introduction of masterbatch reduced the degree of crystallinity of PA6 to a certain extent,but the degree of crystallinity for the PA6 ternary blends did not change with the change of the ratio of r-PVB to POE-g-MA.The crystallization of PA6 was not an important factor that influenced the toughness of PA6/r-PVB/POE-g-MA blends.(3)The formation of the multicore structure in the PA6/r-PVB/POE-g-MA blends was not affected by the masterbatch content.As the masterbatch content increased,the domain size of the dispersed phase in the blends and the core number and size in the multicore structure increased.When the masterbatch content was 25 wt%,the brittle-tough transition occurred in the PA6/r-PVB/POE-g-MA blends,and the critical particle spacing?_cwas 0.30?m.(4)The PA1010,PA1012,PA12 and PA1212 ternary blends were prepared by the masterbatch method,respectively.The structure of the dispersed phase in the PA/r-PVB/POE-g-MA blends was influenced by the type of PA,which might form multicore structure or core-shell structure.The masterbatch could significantly improve the toughness of the various PA. |
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