phenolic resin composites

624

CARBON 52 (2013) 623– 625

Synthesis of carbon nanotubes on carbon fibers by modified

Functionalized graphene oxide with ethylenediamine and 1,6-

chemical vapor deposition

hexanediamine

Zhi-hui

Hua,b, Shao-ming Donga, Jian-bao Hua,b, Zhen Wanga,

Bo Lua,b, Jin-shan Yanga,b, Qing-gang Lia,b, Bin Wua,b, Le Gaoa, Xiang-yu Zhanga a

State Key Laboratory of High Performance Ceramics and Superfine

Jia-lin

Yan, Gui-jiao Chen, Jun Cao, Wei Yang, Bang-hu Xie,

Ming-bo Yang College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China

Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China b

Graduate University of Chinese Academy of Sciences, Beijing 100039,

China

Graphene oxide (GO) obtained by Hummers method was functionalized by ethylenediamine (EA) and 1,6-hexanediamine (HA) in N,N-dimethyl formamide using 1,1,3,3-tetramethy-luronium hexafluorophosphate as a coupling agent. The functionalized

Carbon nanotubes (CNTs) were synthesized on carbon fibers by

GO was characterized by elemental analysis, FT-IR, XRD, XPS,

a modified thermal chemical vapor deposition (CVD) method. The

TGA, SEM and TEM. Results showed one carbon atom in 9–10 of

fibers were first treated at a temperature of 973 K and then treated

the carbon atoms in GO was functionalized by an amine group.

by a mixture of sulfur acid and nitric acid with a volume ratio of 1:3

The thermal stability of the GO functionalized by HA was much

to improve the dispersion of catalyst precursor (Fe (NO3)3
9H2O) on

higher than the one functionalized by EA. However, the former

the surface before impregnation with a catalyst solution. The car-

was less dispersible in N,N-dimethyl formamide than the latter.

bon fibers then underwent simultaneous catalyst reduction and CNT growth to decrease the contact time between the transition

[New Carbon Materials 2012;27(5):370–76]

metal and the carbon fiber surface, and a uniform and thick CNT forest could be obtained with no significant decrease of the

doi:10.1016/j.carbon.2012.10.024

mechanical strength of the carbon fibers compared with those produced by traditional thermal CVD. An in-depth analysis shows that the process parameters have a great influence on the CNT growth rate, such as the type of solvent, concentration of Fe (NO3)3
9H2O, the ratio of H2 to C2H2, and the growth time. It was revealed that a better CNT forest could be obtained when the catalyst solvent is ethanol, the Fe concentration is 100 mM, the ratio of H2/C2H2 is 4/1, the temperature is 1023 K and the growth time is 30 min.

Preparation and properties of graphene oxide–carbon fiber/ phenolic resin composites Yan-zhen Liua, Yong-feng Lib, Yong-gang Yanga, Yue-fang Wenc, Mao-zhang Wanga a

Literature Network Center, Institute of Coal Chemistry, Chinese

Academy of Sciences, Taiyuan, Shanxi 030001, China [New Carbon Materials 2012;27(5):352–61] doi:10.1016/j.carbon.2012.10.022

b

The Sixth Element LID, Changzhou, Jiangshu 213000, China

c

Department of Chemical and Biological Engineering, Zhejiang Univer-

sity, Hangzhou 310058, China

Graphene oxide–carbon fiber/phenolic resin, chemicallyPreparation and mechanical properties of MWCNT and carbon

reduced

fiber reinforced bismaleimide resin composite

thermally-reduced graphene oxide–carbon fiber/phenolic resin

Jun Qiua,b, Zong-ming Wanga

composites were prepared by blending a graphene oxide suspen-

a

sion in an ethanol solution of phenolic resin with carbon fibers,

School of Materials Science and Engineering, Tongji University,

Shanghai, China b

Key Laboratory of Advanced Civil Engineering Materials of Education

of Ministry, Shanghai, China

graphene

oxide–carbon

fiber/phenolic

resin,

and

followed by vacuum drying and hot pressing. The effects of the type of graphene oxide on structure, compressive performance and friction properties of the composites were investigated. Results showed that the compressive properties of the composites were greatly improved with a 0.1 mass graphene oxide %

Bismaleimide reinforced with both MWCNTs and carbon fibers

loading compared with the pure carbon fiber/phenolic resin com-

was prepared by mold-pressing carbon fiber paper stacks impreg-

posite. The compressive strength and modulus of the thermally-

nated with a bismaleimide acetone solution containing MWCNTs

reduced graphene oxide/phenolic resin/carbon fiber composites

grafted with ethylene diamine. The MWCNTs were oxidized by

were increased by 178.9%, 129.5%, respectively, and the highest

concentrated HNO3 to form carboxyl groups before grafting.

energy storage modulus of the chemically-reduced graphene

Results show that the flexural modulus, flexural strength and

oxide/phenolic resin/carbon fiber composite was increased by

impact strength of composite with a 0.5 mass% of MWCNTs is

75.2% compared with the pure carbon fiber/phenolic resin com-

43.85 GPa, 1 160.62 MPa and 28.50 kJ/m2, which represent increases of 49.56%, 17.41% and 19.65% respectively compared

posite. The glass transition temperatures of all the composites containing graphene oxide decreased.

with the carbon fiber/BMI composite. [New Carbon Materials 2012;27(5):362–69] doi:10.1016/j.carbon.2012.10.023

[New Carbon Materials 2012;27(5):377–84] doi:10.1016/j.carbon.2012.10.025