渗透性

PDMS操作参数对合成复合材料纯气体和混合气体渗透性能的影响

由 ty10086 提交于 周四, 08/26/2021 - 13:46

Abstract(#br)A composite polydimethylsiloxane (PDMS)/polyamide (PA) membrane was synthesized and sorption, diffusion and permeation of C 3 H 8 , CH 4 and H 2 were studied both in pure and mixed gas experiments. Pure gas experiments showed that, increasing transmembrane pressure increases solubility, permeability and diffusivity coefficients of heavier gases, C 3 H 8 , while does not affect or slightly decreases those of lighter ones, CH 4 and H 2 .

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Gas permeation through a synthesized composite PDMS/PES membrane

由 ty10086 提交于 周四, 08/26/2021 - 13:46
Abstract(#br)In this paper, a defect-free polydimethylsiloxane (PDMS)-based composite membrane was synthesized and characterized. The membrane consisted of a thin PDMS film (4\u003cce:hsp sp=\"0.25\"/\u003eμm) and polyethersulfone (PES) as a support material. At first, a macroporous PES support was prepared by phase inversion method and its thickness, porosity, pore size distribution and surface porosity were determined. PES characterization results confirmed suitability of the support for the composite membrane preparation.

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Prediction of ternary gas permeation through synthesized PDMS membranes by using Principal Component Analysis (PCA) and fuzzy logic (FL)

由 ty10086 提交于 周四, 08/26/2021 - 13:43
Abstract(#br)Implementation of try and error method for membrane preparation procedures is a time and cost consuming technique. This study tries to present a novel idea to make membrane preparation procedure heuristic. Applying this method, helps researchers to predict performance of a membrane prior to its preparation . At first, a number of membranes are prepared and characterized. Then, their measured separation properties are used for prediction of performance of a membrane before its preparation.

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Preparation and Gas Permeation Properties of PDMS-HNT Nanotube Composite Membrane

由 ty10086 提交于 周四, 08/26/2021 - 12:51
Preparation and Gas Permeation Properties of PDMS-HNT Nanotube Composite MembranePDMS;HNT;nanotube;permeability;composite membrane;PDMS (polydimethylsiloxane)-HNT (halloysite nanotube) composite membranes were prepared with different amounts tendency of HNT 5, 10, 20 and 30 wt% and rubbery polymer PDMS. The characteristics of these membranes were studied by FT-IR, XRD, TGA, and SEM. Gas permeation experiment were performed under condition of $25^{\\circ}C$ and $3kg/cm^2$.

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Preparation and Permeation Characteristics of PDMS-b-PMMA Copolymer Membrane

由 ty10086 提交于 周四, 08/26/2021 - 12:49
Preparation and Permeation Characteristics of PDMS-b-PMMA Copolymer MembranePDMS-b-PMMA;membrane;permeability;selectivity;ATRP;In this research, polydimethylsiloxane-polymethylmethacrylate (PDMS-PMMA) block copolymer was synthesized from polydimethylsiloxane (PDMS) and methylmethacrylate (MMA) monomer using atom transfer radical polymerization (ATRP). The synthesis characterization of the PDMS-b-PMMA copolymer membrane was carried out by a FT-IR, $^1H$-NMR, GPC and DSC.

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Preparation and Characterization of PolyurethanePolydimethylsiloxanePolyamide12bPolytetramethylene Glycol Blend Membranes for Gas Separation

由 ty10086 提交于 周四, 08/26/2021 - 12:48
Blend membranes of synthesized polyurethane based on toluene diisocyanate (TDI), polydimethylsiloxane (PDMS) and polytetramethylene glycol (PTMG) with polyamide12-b-PTMG were prepared by solution casting technique. The synthesized polyurethane-polydimethylsiloxane and PU-PDMS/polyamide12-b-PTMG blend membranes were characterized by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM).

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硅水凝胶膜的形貌对O2渗透性的影响：实验和模拟对领域渗流的新见解

由 ty10086 提交于 周三, 08/25/2021 - 16:25
氧通过有机硅-水凝胶( SiHy )材料的运输，在生物材料的应用中具有极大的兴趣。本研究通过传统的库仑通量法，以及通过1 H NMR T1弛豫法，对含有不同硅氧烷共聚单体的紫外光固化聚丙烯酰胺制成的水凝胶的O2渗透性进行了分析。通过库仑通量法研究表明，与支化硅氧烷( TRIS )相比，具有短线型硅氧烷侧链( PDMS )的交联聚丙烯酰胺( PDMS )具有更高的O2透过率和O2溶解度；而通过核磁共振( NMR ) T1分析直接测定，支化硅氧烷样品的O2溶解度略高于其自由体积。为了了解这种差异背后的原因，我们采用29Si和1H NMR T2弛豫法以及小角X射线散射( SAXS )进行了一系列形态学研究。这些结果是在同一体系上进行的分子动力学模拟的背景下讨论的，这些模拟结果共同有力地提示了形态对O2渗透率起关键作用。提出由线性有机硅( PDMS )制成的样品，其硅氧烷相分离比其体积相对应的TRIS更明显。对于亲水性结构域的渗出路径迂曲度减小的PDMS样品，发现了明显的渗出疏水硅氧烷含量为硅氧烷含量的两倍的硅氧烷结构域。线性硅氧烷中的迁移率也要高得多，这可以归因于分子结构的不同以及由于不同的畴结构所产生的界面和拓扑约束较少。因此，我们提出了一个SiHys中O2渗透的框架，强调了渗透疏水区在设计具有最优O2渗透性能的SiHy中的重要性。

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订阅 渗透性