Yunhe Zhang

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Name: 张云鹤; Zhang, YunHe

Organization: Jilin University , China

Department: College of Chemistry

Title: Associate Professor(PhD)

TOPICS

Polymer

PEEK Polysulfone

Chemicals
References

Preparation of organic–inorganic hybrid membranes with superior antifouling property by incorporating polymer-modified multiwall carbon nanotubes

Co-reporter:Kai Zhu;Guibin Wang;Shuling Zhang;Yinlong Du;Yaning Lu;Ruiqi Na;Yongfeng Mu

RSC Advances (2011-Present) 2017 vol. 7(Issue 49) pp:30564-30572

Publication Date(Web):2017/06/13

DOI:10.1039/C7RA04248E

Functionalized multiwall carbon nanotubes (MWCNTs) were prepared by coating polyvinylpyrrolidone (PVP) on the MWCNTs surface via multiple hydrogen-bonding interactions between polyvinylpyrrolidone and a mussel-inspired polydopamine (PDA) intermediate. The modified MWCNTs exhibited outstanding dispersity and stability in water and were used as a hydrophilic additive to increase the permeability and antifouling properties of polyethersulfone (PES) ultrafiltration membranes. The results of Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) confirmed the introduction of PDA and PVP into the MWCNTs. The measured water contact angle of the hybrid membranes revealed dramatically enhanced hydrophilicity. The morphology of the hybrid membranes was investigated by field emission scanning electron microscopy (FESEM). Furthermore, the permeability and antifouling properties of the hybrid membranes when mixed with different types and quantities of MWCNTs were compared. The hybrid membrane containing 0.1% PVP-modified MWCNTs exhibited the best overall performance, including a flux recovery ratio as high as 95%. The facile and universal treatment method developed in the present study can be used to improve the comprehensive performance of membranes, with great potential application in wastewater treatment.

Highly sulfonated co-polyimides containing cross-linkable hydrophobic tetrafluorostyrol side-groups for proton exchange membranes

Co-reporter:Hongyan Yao, Pengju Feng, Peng Liu, Baijun Liu, Yunhe Zhang, Shaowei Guan and Zhenhua Jiang

Polymer Chemistry 2015 vol. 6(Issue 14) pp:2626-2635

Publication Date(Web):05 Feb 2015

DOI:10.1039/C4PY01694G

A series of novel highly sulfonated co-polyimides (SPI-20s) bearing cross-linkable hydrophobic tetrafluorostyrol side-groups have been successfully synthesized. The cross-linking reaction of the tetrafluorostyrol groups in the SPI-20s was performed at 260 °C without any additive. The glass transition temperatures of the cross-linked membranes were determined by differential scanning calorimetry and dynamic mechanical analysis and found to be higher than the SPI-20s proving the formation of cross-linked networks. There was no elimination of sulfonic acid groups during cross-linking reaction. The cross-linked membranes (Cured-SPI-20s) showed significantly enhanced performances, particularly high proton conductivity (0.103–0.179 S cm−1 at 80 °C), low water uptake (31.2–53% at 80 °C) and swelling ratio (6.4–14.1% at 80 °C). Furthermore, the Cured-SPI-20s exhibited a greatly reduced methanol permeability (3.99–4.93 × 10−7 cm2 s−1), which was lower than that of Nafion 117 (2.94 × 10−6 cm2 s−1) at room temperature. The Cured-SPI-20 membranes also exhibited improved glass transition temperatures (254–277 °C), thermal stability (5% weight loss temperature exceed at 300 °C) and excellent oxidative stability, chemical resistance and mechanical properties. The results indicate that the Cured-SPI-20s were promising candidates as proton exchange membranes in fuel cell technology.

Correction: Chemical grafting of multi-walled carbon nanotubes on metal phthalocyanines for the preparation of nanocomposites with high dielectric constant and low dielectric loss for energy storage application

Co-reporter:Xuefeng Li, Wenhan Xu, Yunhe Zhang, Dan Xu, Guibin Wang and Zhenhua Jiang

RSC Advances 2015 vol. 5(Issue 70) pp:57211-57211

Publication Date(Web):07 Jul 2015

DOI:10.1039/C5RA90064F

Correction for ‘Chemical grafting of multi-walled carbon nanotubes on metal phthalocyanines for the preparation of nanocomposites with high dielectric constant and low dielectric loss for energy storage application’ by Xuefeng Li et al., RSC Adv., 2015, 5, 51542–51548.

Chemical grafting of multi-walled carbon nanotubes on metal phthalocyanines for the preparation of nanocomposites with high dielectric constant and low dielectric loss for energy storage application

Co-reporter:Xuefeng Li, Wenhan Xu, Yunhe Zhang, Dan Xu, Guibin Wang and Zhenhua Jiang

RSC Advances 2015 vol. 5(Issue 64) pp:51542-51548

Publication Date(Web):05 Jun 2015

DOI:10.1039/C5RA07641B

Polymer/CNT (carbon nanotube) composites with a high dielectric constant show great potential for energy storage applications. However, these CNT-based composites usually suffer from high dielectric loss and low breakdown strength, and pose difficulties in the tailoring of the dielectric constant. The integration of a CNT cladding insulator filler layer into the polymers provides an effective way to reach a low dielectric loss and a high breakdown strength. But the insulator layer could significantly reduce the dielectric constant, thereby decreasing the energy storage density of composites. Herein, we have designed and fabricated a novel candidate composed of a semiconductor NH2–CuPc coated multi-walled carbon nanotube (MWCNT-CuPc) through chemical grafting, in which dielectric CuPc layers can act not only as insulation barriers for suppressing leakage current, but also as semi-conductor layers to partially block electron motion. Thus the as-prepared composites exhibit not only a higher dielectric constant but also extremely decreased dielectric loss and excellent dielectric strength. Moreover, the dielectric properties of the composites can be easily tuned by tailoring the loading of MWCNT-CuPc. Our strategy provides a new pathway to achieve polymer/CNT composites with high dielectric performances for energy storage applications.

Poly(ether ether ketone)/wrapped graphite nanosheets with poly(ether sulfone) composites: Preparation, mechanical properties, and tribological behavior

Co-reporter:Wenlong Jiang;Xu Jin;Haibo Zhang;Bo Jiang;Zhenhua Jiang

Journal of Applied Polymer Science 2015 Volume 132( Issue 14) pp:

Publication Date(Web):

DOI:10.1002/app.41728

ABSTRACT

Antiwear composites with extraordinary tribological performances and good mechanical/thermal properties were developed by the dispersion of poly(ether sulfone) (PES) wrapped graphite nanosheets (GNSs) inside a poly(ether ether ketone) (PEEK) matrix via melt blending. The tribological behaviors and the mechanical/thermal properties of the composites were carefully investigated. Compared with pure PEEK and PEEK/GNS composites, the PEEK/wrapped GNS composites exhibited considerable enhancements in those performances; these were attributed to the eliminated layer of PES; this elimination not only eliminated the GNS aggregation inside the PEEK matrix for homogeneous distribution inside the PEEK matrix but also enhanced the interfacial adhesion between the PEEK and wrapped GNSs. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41728.

Ternary graphite nanosheet/copper phthalocyanine/sulfonated poly(aryl ether ketone) dielectric percolative composites: preparation, micromorphologies and dielectric properties

Co-reporter:Yunhe Zhang, Gang Zhang, Dan Xu, Jinfeng Wang, Xu Yang and Zhenhua Jiang

RSC Advances 2014 vol. 4(Issue 54) pp:28721-28727

Publication Date(Web):29 May 2014

DOI:10.1039/C4RA03390F

Novel ternary dielectric percolative composites, consisting of acidified graphite nanosheets (a-GNs)/copper phthalocyanine (CuPc)/sulfonated poly (aryl ether ketone) (SPAEK), were fabricated using a simple solution blending technique. A functional intermediate CuPc layer was introduced and coated on a-GNs to ensure a good dispersion of a-GNs in the SPAEK matrix and suppress the mobility of free charge carriers effectively, resulting in significant improvement of the dielectric properties of a-GNs@CuPc/SPAEK in contrast to a-GNs/SPAEK. Furthermore, enhanced mechanical properties of a-GNs@CuPc/SPAEK compared to SPAEK have been also achieved.

In-situ preparation of high dielectric poly (metal phthalocyanine) imide/MWCNTs nanocomposites

Co-reporter:Gang Zhang, Jianxin Mu, Yu Liu, Zhenhua Jiang, Yunhe Zhang

Synthetic Metals 2014 Volume 188() pp:86-91

Publication Date(Web):February 2014

DOI:10.1016/j.synthmet.2013.12.001

•A series of P(CuPc)I/MWCNTs nanocomposites were prepared by in-situ composite method.•The in-situ composite method was useful to achieve good dispersion of MWCNTs.•The nanocomposites show high dielectric constant and low dielectric loss.The tetra-amino copper (zinc) phthalocyanine was copolymerized with the 4,4′-diaminodiphenyl ether and 4,4′-oxydiphthalic anhydride to synthesize the branched poly (copper phthalocyanine) imide [P(CuPc)I] and poly (zinc phthalocyanine) imide [P(ZnPc)I]. The P(CuPc)I and P(ZnPc)I exhibited higher dielectric constant than that of conventional polyimide due to the introduction of metal phthalocyanine. A series of P(CuPc)I/MWCNTs nanocomposites were prepared by in-situ composite method. The morphological study of nanocomposites by SEM suggested that the in-situ composite method was useful to achieve good dispersion of MWCNTs in P(CuPc)I matrix. A P(CuPc)I/MWCNTs nanocomposite containing 12 vol.% of MWCNTs prepared in this fashion had a high dielectric constant above 200 and a dielectric loss tangent of 2.2 at 1 KHz and room temperature.

Synthesis and properties of novel hyperbranched polyimides end-capped with metallophthalocyanines

Co-reporter:Ling Zhao;Hongyan Yao;Yu Liu;Zhenhua Jiang

Journal of Applied Polymer Science 2013 Volume 128( Issue 5) pp:3405-3410

Publication Date(Web):

DOI:10.1002/app.38567

Abstract

A fluorinated hyperbranched polyimide (HBPI) is synthesized by using a triamine monomer, 1,3,5-tris(2-trifluoromethyl-4-aminophenoxy)benzene (TFAPOB) (B₃), as a “core” molecule, 4,4′-oxydiphthalic anhydride (ODPA) as a A₂ monomer, and 4-aminophthalonitrile as an end-capping reagent. After that, a series of novel fluorinated hyperbranched polyimides end-capped with metallophthalocyanines were prepared by the reactions of dicyanophenyl end-capped hyperbranched polyimide with excessive amounts of 1,2-dicyanobenzene and the corresponding metal salt in quinoline. The resulting polyimides containing metallophthalocyanine unites shows optical absorption in the visible region. The absorption bands of the polymers in chloroform solution are in the range of 665–701 nm. These polyimides show glass transition temperatures between 216 and 225°C, and the 5 wt % weight loss temperature of the polymers varied from 440 to 543°C under nitrogen. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

The microstructure and dielectric properties of modified poly(aryl ether ketone)metallophthalocyanine composites

Co-reporter:Xu Yang;Qitong Wang;Yunhe Zhang;Zhenhua Jiang

Polymer Journal 2012 44(10) pp:1042-1047

Publication Date(Web):2012-04-04

DOI:10.1038/pj.2012.50

Three series of CNPAEK/copper phthalocyanine (CuPc), 2CNPAEK/CuPc and sulfated poly(aryl ether ketone) (SPAEK)/CuPc composites were prepared using a solution blending technique. The CNPAEKs/CuPc composites have a spherical shape with a diameter range of 1–5 μm, although 2CNPAEK/CuPc and SPAEK/CuPc composites have a spherical shape with a diameter ~100 nm because SPAEK and 2CNPAEK exhibit stronger polarities than CNPAEK, resulting in better interphase interactions with metallophthalocyanine. The degree of dispersion and the size of the CuPc particles in the matrix decreases in the following order: SPAEK>2CNPAEK>CNPAEK. The SPAEK/CuPc25 composites exhibit better dielectric properties than either the CNPAEK/CuPc or 2CNPAEK/CuPc composites, with a dielectric constant >400 at 100 Hz and a dielectric loss <0.5.