A strategy to enhance CO2 permeability of well-defined hyper-branched polymers with dense polyoxyethylene comb graft

由 ty10086 提交于 周四, 08/26/2021 - 13:20
文章英文标题
A strategy to enhance CO2 permeability of well-defined hyper-branched polymers with dense polyoxyethylene comb graft
正文
Abstract(#br)Hyper-branched polymers comprised of dense polyoxyethylene (POE) comb graft and poly(methyl methacrylate) (PMMA) backbone are prepared with a well-defined chemical structure and the gas transportation properties are investigated. The CO 2 permeation is strongly dependent on the POE weight fraction. To enhance the CO 2 permeability, a thin film layer of the hyper-branched polymers is formed on a polydimethylsiloxane (PDMS) support with thickness less than 60\u003cce:hsp sp=\"0.25\"/\u003eµm, where poly(vinyl alcohol) (PVA) is blended to improve the membrane formability. The CO 2 permeability is increased by decreasing the thickness of the CO 2 -selective layer. The permeability coefficient of the resulting thin film composite (TFC) membranes exceeds 1000 barrer with 40.5\u003cce:hsp sp=\"0.25\"/\u003ewt% of POE methacrylate (POEM) fraction, when the thickness of the selective layer is smaller than 25\u003cce:hsp sp=\"0.25\"/\u003eµm. It reaches a maximum of 1470 barrer for 15\u003cce:hsp sp=\"0.25\"/\u003eµm selective layer thickness with a CO 2 /N 2 selectivity of 24.5. The permeability coefficient of the selective layer alone is 490 barrer, with CO 2 selectivity of \u003e30. Formation of a POE-rich domain upon microphase separation is confirmed by DSC and SAXS, and this is deemed crucial to enhance CO 2 permeability, due to improved CO 2 solubility in the selective layer. A dense POE comb architecture on the graft chain results in higher CO 2 permeability than that on the polymer backbone.
文章内容（英文）
Abstract(#br)Hyper-branched polymers comprised of dense polyoxyethylene (POE) comb graft and poly(methyl methacrylate) (PMMA) backbone are prepared with a well-defined chemical structure and the gas transportation properties are investigated. The CO 2 permeation is strongly dependent on the POE weight fraction. To enhance the CO 2 permeability, a thin film layer of the hyper-branched polymers is formed on a polydimethylsiloxane (PDMS) support with thickness less than 60\u003cce:hsp sp=\"0.25\"/\u003eµm, where poly(vinyl alcohol) (PVA) is blended to improve the membrane formability. The CO 2 permeability is increased by decreasing the thickness of the CO 2 -selective layer. The permeability coefficient of the resulting thin film composite (TFC) membranes exceeds 1000 barrer with 40.5\u003cce:hsp sp=\"0.25\"/\u003ewt% of POE methacrylate (POEM) fraction, when the thickness of the selective layer is smaller than 25\u003cce:hsp sp=\"0.25\"/\u003eµm. It reaches a maximum of 1470 barrer for 15\u003cce:hsp sp=\"0.25\"/\u003eµm selective layer thickness with a CO 2 /N 2 selectivity of 24.5. The permeability coefficient of the selective layer alone is 490 barrer, with CO 2 selectivity of \u003e30. Formation of a POE-rich domain upon microphase separation is confirmed by DSC and SAXS, and this is deemed crucial to enhance CO 2 permeability, due to improved CO 2 solubility in the selective layer. A dense POE comb architecture on the graft chain results in higher CO 2 permeability than that on the polymer backbone.
来源出处
Journal|[J]Journal of Membrane ScienceVolume 535, 2017. PP 239-247
DOI
https://doi.org/10.1016/j.memsci.2017.04.046

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