Mr. Yujun Zhang Profile

Yujun Zhang

at Harbin Univ of Science and Technology

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Proceedings Article | 13 November 2007 Paper

Actuator based on sulfonated comb copolymer of poly (ethylene-co-vinyl alcohol) grafted by poly (ethylene glycol)

Guifen Gong, Lei Li, Yujun Zhang

Proceedings Volume 6423, 64234B (2007) https://doi.org/10.1117/12.780128

KEYWORDS: Polymers, Actuators, Composites, Electroactive polymers, Sodium, Ions, Metals, Chlorine, Platinum, Glasses

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Comb copolymer consisting of poly (ethylene-co-vinyl alcohol) (EVAL) as backbone and poly (ethylene glycol) (PEG) as side chains (EVAL-g-PEG) has been synthesized, then it was sulfonated by 1,3-propane sultone to get the final ionomer (EVAL-g-SPEG), and ionic polymer-metal composite (IPMC) based on EVAL-g-SPEG was prepared through electroless deposition of platinum onto the surfaces of EVAL-g-SPEG membrane. The graft copolymers were characterized with respect to molecular weight using gel permeation chromatography (GPC) and composition using ¹H-NMR. The results showed that the No. of PEG graft of the side chains is n=1, 2 and others. Thermal properties were examined by DSC and TG. The melt temperature (T_m) and glass transition temperature (T_g) of the comb copolymer increase with the increasing length and the number of the side chains. Moreover, the deformation performance of IPMC material was tested and its results show that the starting response voltage of IPMC actuator decreases with the increasing IEC value. On the other hand, the starting response voltage increases with the decreased side chain length. The IPMC with n=2 side chain length of PEG has the maximum tip displacement, and the maximum tip displacement of IPMC membrane generally decreases with the side chain length of EVAL-g-SPEG. This feature may be the reflection of two opposite effects, namely the decreasing ion densities and increasing water sorption of the membrane.

Proceedings Article | 1 November 2007 Paper

Microstructure effects on proton conductivity in EVOH based ionic polymer-metal composites actuator

Lijun Dai, Lei Li, Yujun Zhang

Proceedings Volume 6423, 64230X (2007) https://doi.org/10.1117/12.779354

KEYWORDS: Polymers, Crystals, Composites, Atomic force microscopy, Ions, Actuators, Electrodes, Absorption, Polymeric actuators, X-ray diffraction

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The ionomer of sulfonated ethylene vinyl alcohol copolymers (EVOH) modified by poly (ethylene glycol) (PEG) (EVOH-g-SPEG) has been synthesized by the following process, EVOH was grafted by PEG through the Williamson reaction and sulfonic groups were introduced onto the end of PEG side chain by the open ring reaction of 1,3-propane sultone and the hydroxyl groups in EVOH. The crystalline structure and phase images of EVOH-g-SPEG membrane were characterized by X-ray diffraction (XRD) and atomic force microscope (AFM), and the ion conductivity is measured by a.c. impedance. XRD indicates that the water in EVOH-g-SPEG membrane region could destroy the membrane crystalline structure and the water absorption membranes are nearly amorphous. AFM phase images of the hydration membranes clearly show the hydrophilic domains, with sizes increasing from 10 to 35 nm as a function of the side chain length and the phase inversion could also be observed when n≥5 (n, numbers of grafting PEG side chain), which was consistent with a rapid increasing in water absorption. The a.c. impedance tests indicate that the comb-like EVOH-g-SPEG grafting with 2 PEG side chain provides the highest ionic conductivity (1.65×10^-3Scm^-1). Moreover, the tip displacement and the bending stress of ionic polymer-metal composites (IPMC) prepared by electroless deposition of argentum were gained by electro-deformation tests. Its results show that the tip bending stress increased with the increasing input voltage and reached to its maximum under the applied voltage of 3.6V~4.4V. IPMC based on the EVOH-g-SPEG membrane exhibits higher bending stress with its maximum value of 6.20MPa.

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