Biodegradable Poly(glycerol sebacate) and Poly(ester amide) Membranes for Pervaporation of Organic/Water Mixtures

• Main Authors: Pao-Yueh Chang, 張寶月
• Other Authors: 孫幸宜
• Format: Others
• Language: en_US
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/14062272530680004631

碩士 === 國立中興大學 === 化學工程學系所 === 105 === In the last decades, biodegradable materials have experienced strong growth and are expected to become a competitor to conventional plastics in future. In this study, two biodegradable membranes poly(glycerol sebacate) (PGS) and poly(1,3-diamino-2-hydroxypropane-co-polyol sebacate) (APS) were applied in the pervaporation process to separate the organic compounds from water. Three other polymer membranes including dimethylpolysiloxane　(PDMS), polyester-based thermoplastic polyurethanes (TPU-ES) and polyether-based thermoplastic polyurethanes (TPU-ET) were introduce into experiment to compare with those two biodegradable membranes. The membranes were characterization within TGA, DSC, SEM, AFM and ATR-FTIR. And the separation performance was tested of five different organic/water mixtures, including ethanol, isopropanol, n-butanol, acetone and acetic acid. The organic/water separation factor increased with the increasing ratio of DSo (degree of swelling in organic solvent)/DSw (degree of swelling in water). In most cases, the PDMS membrane exhibited both higher permeation flux and larger separation factor. These results may be relevant to its higher hydrophobicity and surface roughness. However, the PGS and APS membranes attained better performance in ethanol/water and acetic acid/water pervaporation than PDMS. With the feed solution of 5% ethanol at 37 °C, the PGS and APS membrane confers a normalized flux of 130.6 g/h/m2 and 99.4 g/h/m2. The separation factor of each is 11.6 and 8.2. As for 10% acetic acid feed, the normalized flux is of 235.6 g/h/m2 and 191.4 g/h/m2, and the separation factor of 3.6 and 2.9. Moreover, the pervaporation separation performance of the mixed organic-water solutions was investigated. The performance of PGS and APS varying with degradation time have shown that the normalize flux and separation factor were both almost stay constant in a month, only a slight larger about 6% of flux and a 3% descent in separation factor were observed, indicating that the membrane hold stability at least one month of the pervaporation process.