Properties of PBAT/PA6 in-situ microfibrillar composites
In order to reinforce the polybutylene adipate terephthalate(PBAT),polyamide 6(PA6)was selected as the dispersed phase,and the PBAT/PA6 in-situ microfibrillar composites were prepared using a multi-stage extrusion and stretching device.The microstructure,mechanical properties,crystallization properties,and rheological properties of PBAT/PA6 in-situ micro-fibrillar composites were studied using scanning electron microscopy,testing machine,differential scanning calorimeter,and rota-tional rheometer.The results indicate that PA6 is dispersed into the PBAT matrix in the form of PA6 microfibrils,with the increase of PA6 content,the average diameter of PA6 microfibrils gradually increase,and its diameter distribution also increase.When the mass fraction of PA6 is 12%,the length of PA6 microfibrils in the PBAT-12 sample is longer,and most of the PA6 microfibrils have a length greater than 30 μm.The addition of PA6 increase the crystallization temperature and yield strength of PBAT,PA6 microfibrils act as the heterogeneous nucleation role in the crystallization of PBAT,increasing the crystallization temperature of PBAT by about 14℃.The glass transition temperature of PBAT/PA6 in-situ microfibrillar composites gradually shifts towards high temperature with the increase of PA6 content.With the increase of PA6 content,the yield strength and tensile elastic modulus of PBAT/PA6 in-situ microfibrillar composites first increases and then decreases,the maximum yield strength and tensile elastic modulus of PBAT-12 specimen are 10.3 MPa and 233.5 MPa,respectively.With the increase of PA6 microfibrils content,the values of storage modulus(G'),loss modulus(G")and complex viscosity(η*)first increase and then decrease,and the PBAT-12 sample shows the highest G',G"and η*.
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