viscosity of organic solvent and its diffusivity in polymer solutions

• Main Authors: sung-hwa lin, 林松華
• Other Authors: jyh-ping hsu
• Format: Others
• Language: en_US
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/21928905796264315209

博士 === 國立臺灣大學 === 化學工程學研究所 === 90 === Mobility of the organic solvent molecules in the polymer solutions is explored and analyzed by a mathematical molecular model which is in principal based on the Erying's absolute reaction rate theory and the Boltzmann statistical analysis. Through the molecular model , the viscosity’s dependency and the diffusivity in polymer solution on the free volume for the organic solvent have been derived. According to the analyzed results, this work reveals a better performance than the work done by Doolittle (J. Appl. Phys., 22, 1031, 1951) for the viscosity of organic solvent. Besides, Fujita-Doolittle empirical equation (Fujita et al., Trans. Faraday Soc., 56, 424, 1960) for the diffusivity of mobile molecule in polymer solution is also deduced from this molecular model. An application of present model is accomplished for the co-extrusion process in fabricating the gradient index (GRIN) plastic optical fiber (POF). The reproduced refractive index distributions by present model show a good agreement with the measured results. Moreover, an analytical model for the soft baking of photoresist film which could contribute to the investigation of diffusivity and activation energy of mobile particle in polymer solution is also suggested in the latest part of this thesis.