Effects of Adding Reduced-graphene Oxide/Polypyrrole Composites on the Structure and Properties of Calcium Phosphate Cement†

doi:10.7503/cjcu20150417

Abstract

Abstract:

With the piezoelectricity of natural bone, electrical stimulation has been widely used in clinic for promoting bone growth and reconstruction. It has special meaning to prepare a conductive biomaterial for bone repair. In this paper, reduced-graphene oxide(RGO)/polypyrrole(PPy) composites with high conducity were added in the solid phase of calcium phosphate cement(CPC) and the effect of this addition on the structure and properties was investigated. The composites had great impact on physicochemical properties of CPC. The results showed that the setting time of CPC significantly decreases with RGO/PPy adding. It has great influence of adding RGO/PPy on the mechanical properties and conductivity of CPC, but no obvious effect on the phase composition of CPC. The conductivity of CPC gradually increases with the increase of RGO/PPy adding amount, and the compressive properties show opposite results with RGO/PPy addition. It has a dependent relationship between the adding amount of RGO/PPy and the conductivity and compressive mechanical properties.

Key words: Polypyrrole, Reduced-graphene oxide, Calcium phosphate cement, Conductivity, Mechanical property

CLC Number:

O633

TrendMD:

XIAO Zhenkun, YU Haoran, WU Tao, WANG Ruizhen, PENG Zhang, LU Xiaoying, WENG Jie. Effects of Adding Reduced-graphene Oxide/Polypyrrole Composites on the Structure and Properties of Calcium Phosphate Cement^†[J]. Chem. J. Chinese Universities, 2015, 36(12): 2598.

Figures/Tables 9

Table 1 Formula of preparation of CPC

Sample	Mass fraction of solid phase(%)							Liquid to solid ratio/(mL·g^-1)
Sample	HA	β-TCP	DCPD	CaCO₃	MgO	CS	RGO/PPy	Liquid to solid ratio/(mL·g^-1)
CPC-blank	7.7	52.2	22.5	5.4	2.25	10.0	0	0.5
CPC-PR6	7.2	49.1	21.1	5.1	2.1	9.4	6.0	0.7
CPC-PR8	7.0	48.0	20.7	5.0	2.1	9.2	8.0	0.8
CPC-PR10	6.9	47.0	20.2	4.9	2.0	9.0	10.0	0.9
CPC-PR12	6.7	45.9	19.8	4.8	2.0	8.8	12.0	1.0

Fig.1 Initial(A) and final setting time(B) of CPC samples a. CPC-blank; b. CPC-PR6; c. CPC-PR8; d. CPC-PR10; e. CPC-PR12.

Fig.2 XRD patterns of CPC samples a. PPy/RGD; b. CPC-blank; c. CPC-PR6; d. CPC-PR8;e. CPC-PR10; f. CPC-PR12.

Table 2 Crystallinity of CPC

Sample	CPC-blank	CPC-PR6	CPC-PR8	CPC-PR10	CPC-PR12
X_c(%)	43.2	47.3	54.4	59.8	63.7

Fig.3 Conductivity and sheet resistance of CPC samples

Fig.4 Stress-strain curves of CPC samples a. CPC-blank; b. CPC-PR6; c. CPC-PR8;d. CPC-PR10; e. CPC-PR12.

Fig.5 Compressive strength(A) and elastic modulus(B) of CPC samples a. CPC-blank; b. CPC-PR6; c. CPC-PR8;d. CPC-PR10; e. CPC-PR12.

Fig.6 Porosity of different CPC samples a. CPC-blank; b. CPC-PR6; c. CPC-PR8;d. CPC-PR10; e. CPC-PR12.

Fig.7 SEM images of the fracture surface of CPC (A) RGO/PPy; (B) CPC-blank; (C) CPC-PR6; (D) CPC-PR8; (E) CPC-PR10; (F) CPC-PR12.

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