Preparation, Application Of Sugar Cane Bagasse Poly(Methyl Methacrylate) Graft Copolymer By Solid-state Method

This dissertation firstly studied on the reaction rule between alkali treated sugar cane bagasse(SCB) and methyl methacrylate’s graft copolymerization. The effects of contents of the MMA and the initiator, water content, reaction temperature and reaction time on the graft copolymerization were investigated by the single factor alternate method to optimize the conditions. The methyl methacrylate(MMA)-grafted sugar can bagasse(SCB-g-MMA)was prepared in the optimized condition and characterized by Fourier infrared spectroscopic(FT-IR), nuclear magnetic resonance(NMR), X-ray diffraction analysis(XRD), scanning electron microscope(SEM) and thermal gravimetric ananlysis(TG). The testing results showed that MMA has been grafted on to the SCB.Based on single factor test, response surface methodology(RSM) was applied to investigate the effects of grafting degree and grafting efficiency, dose of monoter, initiator and water. The optimum preparation conditions by grafting degree were 20.10% MMA mass of SCB, 12.85% APS mass of SCB 40%, 50.18% water mass in reaction system; and t he optimum preparation conditions by grafting efficiency degree were 19.61% MMA mass of SCB, 13.01% APS mass of SCB, 51.19% water mass in reaction system.The SC B-g-MMA adsorbent was prepared in the optimum preparation conditions and characterized by FT-IR、NMR and SEM. Experimental result showed that the SCB-g-MMA adsorbent had a stonger adsorption abiligy than SC B. Then investigated the adsorption effects of the SCB-g-MMA on the methylene blue(MB) in aqueous solution under different conditions, such as different SC B-g-MMA dosage, adsorption time, p H and initial concentration of MB. When the initial concentration of MB was 25-400mg/L, p H value of aqueous solution was 6-12, dosage of SC B-g-MMA was more than 10 g/L and adsorption time was more than 40 minutes, removal efficient of MB was 99% at room temperature and the adsorption capacity was 97.3mg/g. Furthermore it was found that the adsorption process was best described by Freundlich model and pseudo-second-order kinetic model.The SCB- g-MMA was prepared as modifier in the optimum preparation conditions and characterized by FT-IR、NMR and SEM. Then SC B-g-MMA was combined with PVA/Starch to make composites. SEM was utilized to examine the morphology of the composites. The fuzzy phase interface between SC B-g-MMA and PVA/Starch indicated SCB-g-MMA was compatible better with PVA/Starch than SCB. The amount of SC B-g-MMA in PVA/Starch blend had some effect on the composites.When SCB-g-MMA was 7phr in PVA/Starch blend, the tensile strength and breaking elongation of the composites reached the maximum and were improved by 153.1% and 277.5% respectively comparing with PVA/Starch blend. When SCB-g-MMA was 10 phr in PVA/Starch blend, the agglomeration happened.