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Polymers (Basel). 2018 Apr 13;10(4). pii: E436. doi: 10.3390/polym10040436.

Reinforced PEI/PVdF Multicore-Shell Structure Composite Membranes by Phase Prediction on a Ternary Solution.

Chae J1,2, Park S3, Kim DY4, Joh HI5, Kim JM6, Lee S7,8, Jo SM9,10.

Author information

1
Center for Materials Architecturing, Korea Institute of Science and Technology,14 Gil 5 Cheongryang-ro, Seongbuk-gu, Seoul 02792, Korea. cjh870725@hanmail.net.
2
Department of Chemical Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea. cjh870725@hanmail.net.
3
Carbon Composite Materials Research Center, Korea Institute of Science and Technology, 92 Chudong-ro, Bongdong-eup, Wanju-gun, Jeollabuk-do 55324, Korea. sejoon.park@kist.re.kr.
4
Center for Materials Architecturing, Korea Institute of Science and Technology,14 Gil 5 Cheongryang-ro, Seongbuk-gu, Seoul 02792, Korea. dykim@kist.re.kr.
5
Department of Energy Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea. hijoh@konkuk.ac.kr.
6
Department of Chemical Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea. jmk@hanyang.ac.kr.
7
Carbon Composite Materials Research Center, Korea Institute of Science and Technology, 92 Chudong-ro, Bongdong-eup, Wanju-gun, Jeollabuk-do 55324, Korea. sunghol@kist.re.kr.
8
Department of Nano Material Engineering, Korea University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea. sunghol@kist.re.kr.
9
Center for Materials Architecturing, Korea Institute of Science and Technology,14 Gil 5 Cheongryang-ro, Seongbuk-gu, Seoul 02792, Korea. smjo@kist.re.kr.
10
Carbon Composite Materials Research Center, Korea Institute of Science and Technology, 92 Chudong-ro, Bongdong-eup, Wanju-gun, Jeollabuk-do 55324, Korea. smjo@kist.re.kr.

Abstract

To construct a polyetherimide (PEI)-reinforced polyvinylidene fluoride (PVdF) composite membrane with multicore-shell structure, a ternary solution was prepared and electrospun by single-nozzle electrospinning. A theoretical prediction was made for the feasibility of complete distinction of two phases. The diameters of the membrane fibers and the PEI multi-core fibrils varied with the PEI ratio and the spinning time, respectively. The tensile strength and modulus were improved to 48 MPa and 1.5 GPa, respectively. The shrinkage of the membrane was only 6.6% at 180 °C, at which temperature the commercial PE separator melted down. The reinforcement in mechanical and thermal properties is associated with multiple PEI nanofibrils oriented along the fiber axis. Indeed, the unique morphology of self-assembled multicore-shell fibers plays an important role in their properties. All in all, PEI/PVdF membranes are appropriate for a lithium-ion battery application due to their high mechanical strength, excellent thermal stability, and controllable textural properties.

KEYWORDS:

Flory–Huggins theory; electrospinning; membrane; multicore-shell; polymer blend

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