| 碳纳米管/聚氨酯杂化膜的原位聚合构建及气体渗透性能 |
| Gas Permeation Property of MWCNT/Polyurethane Mixed Matrix Membranes Prepared by In Situ Polymerization |
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| 摘要: 采用H2SO4/HNO3混酸处理得到不同氧化程度的多壁碳纳米管（MWCNT-COOH），再通过与4，4'-二苯基甲烷二异氰酸酯（MDI）、1，4-丁二醇（BDO）的预聚和扩链反应构建碳纳米管/聚氨酯（MWCNT-COOH/PU）杂化膜。利用傅里叶红外光谱（FTIR）、拉曼光谱（Raman）和透射电子显微镜（TEM）等分析表征多壁碳纳米管结构；探讨了多壁碳纳米管氧化程度和填充量对MWCNT-COOH/PU杂化膜的形貌和CO2、N2渗透性能的影响。结果表明，混酸处理后的多壁碳纳米管带有一定的含氧基团，并随氧化程度的提高，多壁碳纳米管的拉曼光谱G峰和D峰的强度之比（ID/IG）有所增大；氧化程度对多壁碳纳米管在溶剂和杂化膜中的分散性有较大影响，氧化程度越高，分散性越好；杂化膜的CO2、N2渗透性及CO2/N2渗透选择性随多壁碳纳米管氧化程度的增加有所增大，而随多壁碳纳米管填充量的增加表现出先增大后减小的趋势，当氧化程度较高的多壁碳纳米管（H-MWCNT-COOH）填充量为1.0wt%时，H-MWCNT-COOH/PU杂化膜的CO2渗透系数为67.8 Barrer，CO2/N2渗透选择性可达45，表明适量填充MWCNT-COOH能显著提高MWCNT/PU杂化膜的CO2渗透性及CO2/N2的渗透选择性。 |
| 关键词: 多壁碳纳米管 聚氨酯 原位聚合 杂化膜 气体渗透性 |
| 基金项目: 国家自然科学基金（No.21376218，21076190）资助项目。 |
| Abstract: Multi-walled carbon nanotubes(MWCNT) were treated by HNO3/H2SO4 mixture, which were then modified by in situ polymerization with methylene diphenyl 4,4'-diisocyanate (MDI) and 1,4-butanediol (BDO) to form a MWCNT/polyurethane (PU) mixed matrix membrane. The composition and structure of MWCNT-COOH were characterized by Fourier transform infrared (FTIR), Raman spectrum, Transmission electron microscopy (TEM). Streaming potential instrument was used to characterize the dispersion of MWCNT-COOH in dimethylformamide (DMF) solvent. The effect of oxidation degree and content of MWCNT-COOH on CO2 and N2 permeation of MWCNT-COOH/PU mixed matrix membranes was investigated. The results reveal that higher oxidation degree (H-MWCNT-COOH) could reduce the aggregation of MWCNT-COOH, thus improving their dispersion in the mixed matrix membranes. In addition, the CO2, N2 permeability and CO2/N2 permeation selectivity are obviously enhanced with increasing the oxidation degree of MWCNT-COOH. In the mixed matrix membrane with 1.0wt% H-MWCNT-COOH content, the CO2 permeability is 67.8 Barrer and CO2/N2 permeation selectivity is 45, indicating the important role of the MWCNT-based additive in improvement of CO2 permeability and selectivity to N2. |
| Keywords: multi-walled carbon nanotubes polyurethane in-situ polymerization mixed matrix membrane gas permeation |
| 投稿时间：2014-04-03 修订日期：2014-06-27 |
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| 陈雨霏,赵丽,丁龙飞,王挺,吴礼光.碳纳米管/聚氨酯杂化膜的原位聚合构建及气体渗透性能[J].无机化学学报,2014,30(10):2301-2307. |
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