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聚醚改性聚二甲基硅氧烷膜制备及其CO2/N2分离性能研究

作者：何悦，王生伟，白云翔，张春芳

单位：江南大学合成与生物胶体教育部重点实验室化学与材料工程学院，无锡 214122

关键词：聚二甲基硅氧烷；聚醚改性； CO2分离；操作压差

DOI号： 10.16159/j.cnki.issn1007-8924.2025.04.002

分类号： TQ028

出版年,卷(期):页码： 2025,45(4):15-24

摘要：

通过硅氢加成反应，以烯丙基聚乙二醇（APEG-350/APEG-500）、乙烯基三乙氧基硅烷（VTES）和含氢硅油（PHMS）为原料，设计合成聚醚功能化交联剂HVA350/HVA500，并利用其与聚二甲基硅氧烷（PDMS）进行化学交联，构建聚醚改性PDMS（PDMS/HVA）膜，研究交联剂结构和添加量对膜理化结构和CO2/N2分离性能的影响。结果表明，PDMS/HVA膜具有优异的成膜性和机械性能；聚醚功能化交联网络的形成不但能够减小PDMS链间距，提高膜的CO2扩散选择性，而且锚定的聚醚链段可通过偶极-四极矩作用提高CO2溶解选择性。当HVA添加量为30%（质量分数）时，PDMS/HVA350的CO2渗透系数为2 934 Barrer，CO2/N2选择性为11.37；PDMS/HVA500膜的CO2渗透系数为2 992 Barrer，CO2/N2选择性为10.42，均表现出优异的CO2分离性能。

Polyether-functionalized crosslinker (HVA350/HVA500) was designed and synthesized via hydrosilylation of allyl poly(ethylene glycol) (APEG-350/APEG-500), vinyltriethoxysilane (VTES), and polymethylhydrosiloxane (PHMS). The crosslinker was employed to chemically crosslink polydimethylsiloxane (PDMS), forming polyether-modified PDMS (PDMS/HVA) membranes. The effects of crosslinker structure and content on the physicochemical structure and CO2/N2 separation performance of the membranes were systematically investigated. The results demonstrated that PDMS/HVA membranes exhibited excellent film-forming ability and mechanical properties. The formation of polyether-functionalized crosslinked networks not only reduced the interchain spacing of PDMS, enhancing CO2 diffusion selectivity, but also improved CO2 solubility selectivity through dipole-quadrupole interactions between anchored polyether segments and CO2 molecules. At a 30% (mass fraction) HVA loading, the CO2 permeability of PDMS/HVA350 reached 2 934 Barrer with a CO2/N2 selectivity of 11.37, while PDMS/HVA500 exhibited a CO2 permeability of 2 992 Barrer and a CO2/N2 selectivity of 10.42, demonstrating outstanding CO2 separation performance.

基金项目：

国家自然科学基金面上项目（22278177）

作者简介：

何悦（2000-），女，江西南昌人，硕士研究生，主要从事膜材料制备及应用研究

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