High performance polydimethylsiloxane pervaporative membranes with hyperbranched polysiloxane as a crosslinker for separation of n-butanol from water
| Autor: | Lin Jiaqiang, Yunxiang Bai, Liangliang Dong, Yuanhua Zhu, Yuping Sun, Chunfang Zhang, You-Yi Xu, Jin Gu |
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| Rok vydání: | 2015 |
| Předmět: |
Chromatography
Aqueous solution Polydimethylsiloxane Chemistry General Chemical Engineering technology industry and agriculture macromolecular substances General Chemistry Branching (polymer chemistry) chemistry.chemical_compound Membrane Chemical engineering n-Butanol Barrer Pervaporation Selectivity |
| Zdroj: | RSC Advances. 5:52759-52768 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c5ra06886j |
| Popis: | Hyperbranched polysiloxane (HPSiO) was successfully synthesized by a three-step process. The result of 29Si Nuclear Magnetic Resonance (NMR) measurement indicates that the degree of branching (DB) of HPSiO is 0.73. Then, novel polysiloxane membranes, HPSiO-c-PDMS, were prepared by the cross-linking reaction between HPSiO and α,ω-dihydroxypolydimethylsiloxane (H-PDMS) with different molecular weights. HPSiO-c-PDMS membranes were first used as membrane materials for recovering n-butanol from an aqueous solution by pervaporation (PV). The HPSiO-c-PDMS membranes demonstrated high n-butanol/water selectivity as well as high permeability. As the molecular weight of H-PDMS increased, the selectivity increased and the n-butanol permeability of HPSiO-c-PDMS-2 (with moderate H-PDMS molecular weight) membrane showed the highest value. The effects of temperature and feed concentration on the PV performances were also investigated. The PV performance, n-butanol permeability and n-butanol/water selectivity of the HPSiO-c-PDMS-2 membrane, reached 4.3 × 105 Barrer and 8.75, respectively, with a feed concentration of 1.0 wt% at 30 °C. |
| Databáze: | OpenAIRE |
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