Synthesis of vinylferrocene and the ligand-exchange reaction between its copolymer and carbon nanotubes

doi:10.1007/s11705-014-1428-8

Front. Chem. Sci. Eng.

2014, Vol. 8

Issue (2) : 171-178 https://doi.org/10.1007/s11705-014-1428-8

RESEARCH ARTICLE

Synthesis of vinylferrocene and the ligand-exchange reaction between its copolymer and carbon nanotubes

Ran SHI¹,Hai WANG²,Ping TANG¹,Yuezhen BIN^1,^*(

)

1. Department of Polymer Materials and Engineering, Dalian University of Technology, Dalian 116024, China
2. Department of Future Industry-Oriented Basic Science and Materials, Toyota Technological Institute, Tempaku, Nagoya 468-8511, Japan

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Abstract

To improve the dispersibility of carbon nanotubes (CNTs), poly(vinylferrocene-co-styrene) (poly(Vf-co-St)), was grafted onto the surface of CNTs by a ligand-exchange reaction. Poly(Vf-co-St) was obtained by a radical copolymerization reaction using styrene and vinylferrocene as the monomers. The vinylferrocene was synthesized from ferrocene via a Friedel-Crafts acylation. The molecular weight, molecular weight distribution, and amount of Vf in the poly(Vf-co-St) were 1.32 × 10⁴, 1.69 and 17.6% respectively. The degree of grafting of the copolymer onto the CNTs surface was calculated from thermogravimetric analysis and varied from 27.1% to 79.7%. The addition of the poly(Vf-co-St) greatly promoted the dispersibility of the modified CNTs in anhydrous alcohol. The electrical conductivity of composites prepared from the polymer-grafted CNTs and copolymer (acrylonitrile, 1,3-butadiene and styrene, ABS) strongly depended on the degree of grafting. These results show that the amount of polymer grafted onto the surface of CNTs can be controlled and that the electrical properties of composites prepared with these grafted polymers can be tuned.

Keywords vinylferrocene poly (Vf-co-St) CNTs dispersibility

Corresponding Author(s): Yuezhen BIN

Issue Date: 22 May 2014

Cite this article:

Ran SHI,Hai WANG,Ping TANG, et al. Synthesis of vinylferrocene and the ligand-exchange reaction between its copolymer and carbon nanotubes[J]. Front. Chem. Sci. Eng., 2014, 8(2): 171-178.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-014-1428-8
https://academic.hep.com.cn/fcse/EN/Y2014/V8/I2/171

Fig.1 Scheme 1 Synthesis of vinylferrocene

Fig.2 Scheme 2 Radical polymerization reaction of styrene and vinylferrocene

Fig.3 Scheme 3 Grafting of polymer onto the CNT surface

Fig.4 FTIR spectrum of vinylferrocene

Tab.1 Molecular weight and composition of the poly(Vf-co-St) copolymer

Fig.5 FTIR of poly(Vf-co-St) synthesized by the radical polymerization of vinylferrocene and styrene

Fig.6 Weight loss of (A) untreated HGF, (B) poly(Vf-co-St) grafted HGF, and (C) poly(Vf-co-St) grafted VGCF-H

Tab.2 Grafting reaction parameters and grafting degree

Fig.7 TEM photographs of (A) VGCF-H at low magnification, (A') VGCF-H at high magnification, (B) uniform layer in polymer-grafted VGCF-H, (B’) polymer ball in polymer-grafted VGCF-H, and (C) polymer-grafted HGF

Fig.8 Dispersibility of CNTs (HGF) in anhydrous alcohol before (A) and after modification (B)

Tab.3 Electrical conductivities of composites prepared from ABS and modified CNTs (HGF) with different grafting degrees

Fig.9 Composite prepared from polymer grafted HGF (grafting degree 60.8%) and ABS

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