Miscibility of Polymer Blend System:Poly(methyl methacrylate) and Poly(ethyl oxide)

• Main Authors: Lai, Tzu-Yung, 賴資源
• Other Authors: Yan-Ping Chen
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/28205055164702873326

碩士 === 國立臺灣大學 === 化學工程研究所 === 85 === The miscibility of the poly(methyl methacrylate) and poly(ethylene oxide) blends has been studied using the solvent casting method. Six solvents of benzene, tlouene, acetone, tetrahydrofuran, propyl acetate, iso-propyl acetate were used. The glass transition and melting temperatures of the crystalline- amorphous blends were measured by differential scanning calorimeter (DSC). It is shown that the blends of various compositions are miscible in their molten state. The Flory-Huggins interaction parameters were determined using the melting depression analysis. Theseparameters are composition-dependent for this polymer blend system, and theirvalues are negatie for the blends prepared from various casting solvents. Generally, tetrahydrofuran and benzene are better solvents where the blends have a more homogeneous morphology. The Folry-Huggins interaction parameters are also plotted against the boiling temperatures of various casting solvents. A consistent correlation shows that more negative values of interaction parameters exist between the boiling temperatures of 65 to 75 oC for blends of various compositions. This temperature range correspond to the tetrahydrofuran and benzene used in this study. It is indicated that the correlation is useful in selecting the appropriate solvents in preparing polymer blends. Further investigation on more polymer blend and castingsolvent systems are essential to generalize this correlation. The miscibility of the poly(methyl methacrylate) and poly(ethylene oxide) blends has been studied using the solvent casting method. Six solvents of benzene, tlouene, acetone, tetrahydrofuran, propyl acetate, iso-propyl acetate were used. The glass transition and melting temperatures of the crystalline- amorphous blends were measured by differential scanning calorimeter (DSC). It is shown that the blends of various compositions are miscible in their molten state. The Flory-Huggins interaction parameters were determined using the melting depression analysis. Theseparameters are composition-dependent for this polymer blend system, and theirvalues are negatie for the blends prepared from various casting solvents. Generally, tetrahydrofuran and benzene are better solvents where the blends have a more homogeneous morphology. The Folry-Huggins interaction parameters are also plotted against the boiling temperatures of various casting solvents. A consistent correlation shows that more negative values of interaction parameters exist between the boiling temperatures of 65 to 75 oC for blends of various compositions. This temperature range correspond to the tetrahydrofuran and benzene used in this study. It is indicated that the correlation is useful in selecting the appropriate solvents in preparing polymer blends. Further investigation on more polymer blend and castingsolvent systems are essential to generalize this correlation.