title: Synergistic strengthening of polyelectrolyte complex membranes by functionalized carbon nanotubes and metal ions.
abstract: Hydrophilic polymers have garnered much attention due to their critical roles in various applications such as molecular separation membranes, bio-interfaces, and surface engineering. However, a long-standing problem is that their mechanical properties usually deteriorate at high relative humidity (RH). Through the simultaneous incorporation of functionalized carbon nanotubes and copper ions (Cu(2+)), this study introduces a facile method to fabricate high strength polyelectrolyte complex nanohybrid membranes resistant to high RH (90%). For example, the tensile strength of the nanohybrid membranes is 55 MPa at 90% RH (80% of the original value at 30% RH). These results are explained by copper ions depressing the swelling degree of the membrane, and functionalized carbon nanotubes promoting stress transfer between the polymer matrix and them. The nanohybrid membranes are efficient in separating water/alcohol mixtures containing relatively high water content (up to 30 wt%), whereas common hydrophilic polymer membranes usually suffer from excessive swelling under this condition.
authors.affiliation: MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Liu
authors.affiliation: MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China.
authors.forename: Quan-Fu
authors.initials: QF
authors.lastname: An
authors.affiliation: MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhao
authors.affiliation: MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China.
authors.forename: Jia-Kai
authors.initials: JK
authors.lastname: Wu
authors.affiliation: MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China.
authors.forename: Yi-Hu
authors.initials: YH
authors.lastname: Song
authors.affiliation: MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China.
authors.forename: Bao-Ku
authors.initials: BK
authors.lastname: Zhu
authors.affiliation: 1] Department of Chemical Engineering and Bioengineering, Zhejiang University, Hangzhou 310027, China [2] The Development Center of Water Treatment Technology, Hangzhou 310012, China.
authors.forename: Cong-Jie
authors.initials: CJ
authors.lastname: Gao