Preparation And Performance Research Of Cellulose / Epoxy Vegetable Oil Composite Materials

With the development of cellulose dissolving technology, the preparation of cellulose-based materials have become possible. Through a variety of techniques and methods, to reduce costs, improving the inherent shortcomings of materials and their performance, giving a new functional to materials, increasing its value-added products have become a hot research in the field of cellulose-based materials. In this work, the alkali / urea/ H2 O solution for the preparation of porous regenerated cellulose(RC) films as matrix, regenerated cellulose(RC) / epoxy soybean oil(ESBO) composite films and regenerated cellulose(RC) / bisphenol A type epoxy resin(EP) / epoxy soybean oil(ESBO) composite films were prepared by thermal-curing technology, then the structure and properties of the composite films were studied. The research content mainly includes the following two parts:1. The preparation and performance research of regenerated cellulose(RC) / epoxy soybean oil(ESBO) composite filmsThe regenerated cellulose(RC) porous films were prepared by dissolving the cotton fiber using Li OH / urea / H2 O solution. After replacement of the solvent in the regenerated cellulose(RC) films, the regenerated cellulose(RC) films were immersed in epoxy soybean oil(ESBO) precursor solution, then regenerated cellulose(RC) / epoxy soybean oil(ESBO) composite films were prepared by thermal-curing technology, then the effects of different ratio between the anhydride equivalent of maleic anhydride and epoxy equivalent of epoxy soybean oil(ESBO) and the concentration of epoxy soybean oil(ESBO) on the structure and properties of the composite films were investigated. The structure and properties of the composite films were studied by FTIR, XRD, DSC, TGA, SEM, UV light transmittance, water contact angle, water absorption and mechanical properties test. The results showed that cellulose involved in the curing reaction of epoxy soybean oil(ESBO) and promote the curing of epoxy soybean oil(ESBO), and the crystalline structure of cellulose was destroyed. The introduction of epoxy soybean oil(ESBO) improved the water resistance of the composite films, and the heat resistance and transparency of the composite film decreased. When the epoxy soybean oil(ESBO) content was appropriate, and ratio of the epoxy equivalent and anhydride equivalent moderate control, the regenerated cellulose(RC) composite films could obtain excellent comprehensive tensile properties.2. The preparation and performance research of regenerated cellulose(RC) / epoxy soybean oil(ESBO) composite films under the presence of bisphenol A type epoxy resin(EP)The regenerated cellulose(RC) porous films were prepared by dissolving the cotton fiber using Li OH / urea / H2 O solution. After replacement of the solvent in the regenerated cellulose(RC) films, the regenerated cellulose(RC) films were immersed in bisphenol A type epoxy resin(EP) and epoxy soybean oil(ESBO) precursor solution, the regenerated cellulose(RC) / epoxy resin(EP) / epoxy soybean oil(ESBO) composite films were prepared by thermal-curing technology. Under the presence of bisphenol A type epoxy resin(EP), the influences of the content of epoxy soybean oil(ESBO) on the structure and properties of composite films and the content of curing agent polyether amine on the mechanical properties of composite films were investigated. The structure and properties of the composite films were studied by FTIR, XRD, DSC, TGA, SEM, UV light transmittance, water contact angle, water absorption and mechanical properties test. The results showed cellulose has a promoting effect on curing epoxy resin system and the crystal structure of cellulose also was destroyed. The morphology showed that under the presence of bisphenol A type epoxy resin(EP), with the increase of epoxy soybean oil(ESBO) content in composite films, phase separation intensified, and the surface of the film roughness increased. Reflected in the macro properties of composite films was good toughness, but the intensity decreased, and the water absorption rate of composite films remained low, but the hydrophilicity of the films surface enhanced, and little effect on heat resistance of films, but the transmittance decreased. With the increase of polyether amine content, composite films elongation at break increased, but the intensity decreased.