Investigation on coarsening in thermally induced phase separation for ternary system

• Main Authors: Guan-Yeu Lin, 林冠宇
• Other Authors: Juih-Yih Lai
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/4t6y9k

碩士 === 中原大學 === 化學工程研究所 === 93 === In this study, the mechanisms of coarsening in the late stage of phase separation for ternary compositions of Poly(DL-lactide- co-glycolide) (PLGA)/dioxane/water and Polysulfone (PSf)/Diethyl glycol dimethyl ether (DGDE)/Ethanol systems were investigated via thermal induced phase separation (TIPS). Optical microscopy was used to observe the coarsening phenomena of phase separation and the interfacial tension between polymer rich phase and poor phase and the viscosity of polymer rich phase of polymer solution were measured to investigate the mechanism of growth. The results show that the growth rate of pore increases with increasing the quench depth for PLGA system. The coarsening rate was dominated by interfacial tension in this system. For PSf system, the interfacial tension as well as the viscosity of polymer rich phase increases with increasing the quench depth at/above the composition of critical point. The interfacial tension dominated the coarsening rate when the quench depth was lower then 13℃ or 10℃ while the coarsening rate was dominated by viscosity when the quench depth was higher then 13℃ or 10℃ in the case of 6 wt% PSf system (the composition of critical point) and 9 wt% PSf system (above the composition of critical point), respectively.