The study focused on the performance enhancement of a PDMS membrane using PMHS as the curing agent, and by incorporation of silica nanoparticles with four different silica contents of 2.5, 5, 7.5 and 10 wt%. The membranes were synthesized and applied as the separation elements to improve the separation of DMSO from their aqueous solutions. The properties of the membranes were studied by attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), field emission scanning electronic microscopy and thermal gravimetric analysis (TGA). ATR-FTIR results indicated the integration of silica nanoparticles into the nanocomposite membranes and also confirmed the cross-linking reaction between the PMHS and the PDMS. The TGA curve of hybrid membranes displayed that the proper incorporation of SiO2 nanoparticles could clearly improve the thermal stability of the unfilled membrane. Moreover, swelling of prepared membranes was attained for different feed solutions. Results showed that the separation factor and flux of the PDMS/PMHS membrane were enhanced by the incorporation of hydrophobic silica particles into the composite. The maximum separation factor of 830.33 was achieved for the feed mixture with an initial DMSO concentration of 25 vol%, using the membrane with 5 wt% silica content.

中文翻译：

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嵌入二氧化硅纳米粒子的 PMHS-PDMS 复合膜的合成及其在从水溶液中分离 DMSO 中的应用

该研究的重点是使用 PMHS 作为固化剂，并通过掺入具有 2.5、5、7.5 和 10 wt% 四种不同二氧化硅含量的二氧化硅纳米粒子来增强 PDMS 膜的性能。该膜被合成并用作分离元件以改善 DMSO 从其水溶液中的分离。通过衰减全反射傅里叶变换红外光谱 (ATR-FTIR)、场发射扫描电子显微镜和热重分析 (TGA) 研究膜的性质。ATR-FTIR 结果表明二氧化硅纳米粒子整合到纳米复合膜中，也证实了 PMHS 和 PDMS 之间的交联反应。混合膜的 TGA 曲线表明，适当掺入 SiO2 纳米粒子可以明显提高未填充膜的热稳定性。此外，对于不同的进料溶液，制备的膜获得了溶胀。结果表明，通过将疏水性二氧化硅颗粒掺入复合材料中，PDMS/PMHS 膜的分离因子和通量得到提高。对于初始 DMSO 浓度为 25 vol% 的进料混合物，使用具有 5 wt% 二氧化硅含量的膜，实现了 830.33 的最大分离因子。结果表明，通过将疏水性二氧化硅颗粒掺入复合材料中，PDMS/PMHS 膜的分离因子和通量得到提高。对于初始 DMSO 浓度为 25 vol% 的进料混合物，使用具有 5 wt% 二氧化硅含量的膜，实现了 830.33 的最大分离因子。结果表明，通过将疏水性二氧化硅颗粒掺入复合材料中，PDMS/PMHS 膜的分离因子和通量得到提高。对于初始 DMSO 浓度为 25 vol% 的进料混合物，使用具有 5 wt% 二氧化硅含量的膜，实现了 830.33 的最大分离因子。