Manufacturing and Properties of Poly (Methyl Methacrylate)/ Tin Dioxide nano Composites

• Main Authors: Chi-Yuan Feng, 馮棋源
• Other Authors: Ching-Bin Lin
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/96810516345145613992

碩士 === 淡江大學 === 機械與機電工程學系碩士班 === 95 === The study investigats the mass transport and hydrolysis behavior for poly (methyl methacrylate) (PMMA) in various concentrations of methanol/ tin chloride (SnCl2•2H2O) cosolvent between 40℃ to 60℃. Furthermore, by using the successfully manufactured poly (methyl methacrylate)/ tin dioxide nano composites, the mechanical, optical and thermal properties are investigated. The experiment data reveals that the concentration of SnCl2•2H2O to methanol in the solvent mixture is X＝0, 0.03, 0.05, 0.07 and 0.09g/g and the saturated absorption amount of cosolvent will increase by rising mass transport temperature. Both diffusion coefficient for Case I and diffusion velocity for Case II will decrease with increasing concentration of cosolvent X. The activation energy of diffusion coefficient in Case I transport decreases with increasing X, but the activation energy of diffusion coefficient in Case II transport is opposite. The mass transport process is endothermic and satisfies the van’t Hoff’s plot. When PMMA with saturated solvent mixture carries out the diffusion exchange between water and methanol solvent in distilled water system as well as the glass transition temperature of PMMA is higher than the hydrolysis temperature, the weight loss namely tends to slowly resolved. Through XRD analysis, as the temperature of cosolvent and mass transport goes up, the wave peak intensify of tin dioxide becomes more obvious. By means of SEM, tin dioxide particulates are found evenly distributed on the matrix and the quantity of particulates become higher with the increasing cosolvent concentration. The size of particulates is about 30-50nm. Through visible wavelength and the UV spectrum analysis, the transmittance is found declined as the mass transport and the cosolvent concentration increases and the cut-off wavelength tends to shift to long wavelength (red shift). The FTIR spectrum analysis shows that tin dioxide particulates and PMMA has no obvious surface bonding. Therefore, no new absorption peak is found and so do the change shown on the wave shape. In addition, both the UTS (Ultimate Tensile Strength) and the elongation ratio of the composites go down with the increasing cosolvent concentration and the uprising mass transport temperature. However, the ratio of brittleness fracture surface morphology, Shore Hardness (Hs) and the glass transition temperature (Tg) will go up with the increasing cosolvent concentration and the uprising mass transport temperature.