[ACS Appl. Mater. Interfaces] Engineering porous polymer hollow fiber microfluidic reactors for sust
The highly hydrophilic and solvent-stable porous polyamide-imide (PAI) hollow fibers were created by crosslinking of bare PAI hollow fibers with 3-aminopropyl trimethoxy silane (APS). The APS-grafted PAI hollow fibers were then functionalized with salicylic aldehyde for binding catalytically active Pd(II) ions through covalent post-modification method. The catalytic activity of the composite hollow fiber microfluidic reactors (Pd(II) immobilized APS-grafted PAI hollow fibers) was tested via heterogeneous Heck coupling reaction of aryl halides under both batch and continuous flow reaction in polar aprotic solvents at high temperature (120 °C) and low operating pressure. XPS and ICP analyses of the starting and recycled composite hollow fibers indicated that the fibers contain very similar loading of Pd(II), implying no degree of catalyst leaching from hollow fibers during reaction. The composite hollow fiber microfluidic reactors showed long-term stability and strong control over the leaching of Pd species.
Yingxin He, Fateme Rezaei, Kapila Shubhender, and Ali Asghar Rownaghi ACS Appl. Mater. Interfaces, Just Accepted Manuscript DOI: 10.1021/acsami.7b04092 Publication Date (Web): May 2, 2017 Copyright © 2017 American Chemical Society