Visualization For Dynamic Distribution Of Organic Additives In Polymer Composites

Polymer products have a large output and a wide range of consumption,and occupy an important position in the national economy.Polymer materials are easy to produce and process,but a single polymer material will have various defects when used,and additives often need to be mixed to improve its macroscopic properties.Among them,the dispersion degree of additives in the polymer matrix and its interaction with the matrix directly determine the properties of polymer composites.Therefore,it is of great significance to monitor the distribution and real-time monitoring of organic additives in polymer matrix composites.In this work,we use low-density polyethylene(LDPE)and aminosilicone oil(ASO)blends as an organic-organic polymer composite system,based on the fluorescence changes of aminosilicone oil under external conditions,using confocal laser scanning microscopy.The visualization and quantitative analysis of the three-dimensional distribution of amino silicone oil in composites were carried out,and the correlation between the dynamic distribution changes of amino silicone oil and the properties of composites was explored.The inorganic additive hydrotalcite(LDHs)was further introduced,and the effect of LDHs on the distribution of amino silicone oil and composites was studied.The specific research contents are as follows:1.ASO/LDPE composites were prepared by blending amino silicone oil(ASO)as organic additive with low density polyethylene(LDPE).Fluorescence spectra showed that ASO exhibited green fluorescence emission under heat treatment,and it was verified by XPS et al.that the fluorescence originated from the reactive cross-linking between adjacent amino groups of ASO.Using fluorescence imaging technology to track ASO in ASO/LDPE composites,the crosslinking changes and dynamic distribution of ASO can be observed in threedimensional space.Further quantitative analysis found that the cross-linking reaction of ASO followed first-order reaction kinetics,and the reaction rate constant increased with the increase of temperature and ASO content.More importantly,the cross-linked ASO enhanced the tensile strength of the composites,so that the change law of the mechanical properties of the composites was consistent with the change of the reaction rate constant of ASO,so the correlation between the microstructure and macroscopic properties of ASO/LDPE composites was obtained.relation.2.A polymer composite material composed of ASO,LDHs and LDPE was constructed.The effect of inorganic additive LDHs in composites on the reaction behavior and dispersion of organic additive ASO was visualized by 3D fluorescence imaging.The imaging analysis results showed that due to the interaction between a large number of hydroxyl groups on the surface of LDHs and the amino groups in the amino silicone oil,the coupling reaction between the amino groups of the adjacent silicone oil chains of ASO was inhibited,and the fluorescence generation of ASO was reduced.The inhibitory behavior of LDHs on ASO cross-linking reaction was further studied quantitatively.With the increase of LDHs content,the inhibitory effect of LDHs on ASO crosslinking process was enhanced.In addition,the macroscopic mechanical properties of ASO/LDH/LDPE composites were studied and it was found that due to the interaction between LDHs and ASO,the heterophasic compatibility in the composites was improved,thereby improving the mechanical properties of the composites.