Synthesis of lignin nanofibers with ionic-responsive shells: water-expandable lignin-based nanofibrous mats.
Synthesis of lignin nanofibers with ionic-responsive shells: water-expandable lignin-based nanofibrous mats.
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DOI：
10.1021/bm301039f
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发表时间：
2012-10
影响因子：
6.2
通讯作者：
Guangzheng Gao;James Ian Dallmeyer;J. Kadla
中科院分区：
文献类型：
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作者：
Guangzheng Gao;James Ian Dallmeyer;J. Kadla
采用水相表面引发原子转移自由基聚合（SI-ATRP）法制备了一系列离子响应性聚N-异丙基丙烯酰胺（PNIPAM）表面改性木质素纤维素复合材料。通过调节初始单体浓度和表面引发剂浓度，将不同分子量、厚度和接枝密度的PNIPAM刷固定在静电纺木质素纤维毡上。ATR-FTIR、SEM、TGA、XPS和水接触角测量证实了成功的表面改性。对PNIPAM改性木质素纤维素复合材料（Lig-PN）的分析发现，LCST与PNIPAM相似，并表现出离子响应特性。随着离子浓度的增加，Lig-PN的水接触角相应增加。AFM图像显示木质素纤维毡表面的PNIPAM在水中膨胀，在0.5M Na（2）SO（4）中收缩。
A series of ionic responsive poly(N-isopropylacrylamide) (PNIPAM) surface-modified lignin nanofiber mats were prepared by aqueous surface-initiated atom transfer radical polymerization (SI-ATRP). PNIPAM brushes with various molecular weights, thickness, and grafting densities were immobilized on electrospun lignin nanofiber mats by adjusting initial monomer concentration and surface initiator density. ATR-FTIR, SEM, TGA, XPS, and water contact angle measurements confirmed successful surface modification. Analysis of the PNIPAM-modified lignin nanofiber mats (Lig-PN) found that the lower critical solution temperature (LCST) was similar to that of PNIPAM and demonstrated ionic responsive characteristics. With increasing ionic concentration, the water contact angles of the Lig-PN increased correspondingly. AFM images showed that the PNIPAM on the lignin nanofiber mat surface expanded in water and contracted in 0.5 M Na(2)SO(4).