Fabrication of Natural Rubber/Chemically Reduced Graphene Oxide Nanocomposites and Nuclear Radiation Resistant Behavior†

doi:10.7503/cjcu20160144

Abstract

Abstract:

Natural rubber(NR)/chemically reduced graphene oxide(RGO) nanocomposites were fabricated by latex mixing plus in situ reduction process. The transmission electron microscopy morphology shows that uniform dispersion of RGO with a few layers of stacked lamellar structure can be observed in the nano-composites. The effect of γ irradiation on the mechanical property and thermal stability of NR matrix by the incorporation of RGO was mainly investigated in detail. Compared to pure NR, the tensile strength increases from (22±1.4) MPa to (25±1.1) MPa and the thermal decomposition temperature of 50% mass loss(T₅₀) is increased by 6.4 ℃ for NR/RGO nanocomposites by the addition of 0.6% RGO before irradiation. After γ irradiation dose of 200 kGy, the tensile strength and T₅₀ of pure NR are decreased by 75% and 4.5 ℃, respectively. However, those of NR/RGO-0.6% nanocomposites are decreased only by 56% and 1.2 ℃, respectively. The radiation resistant mechanism of NR/RGO nanocomposites was also interpreted by electron paramagnetic resonance measurements. The results reveal that RGO can act as free radical scavenger, and the introduction of RGO to NR matrix exhibits much less amount of free radicals.

Key words: Natural rubber/reduced graphene oxide nanocomposite, Radiation resistant behavior, Tensile strength, Thermal stability, Free radical scavenger

CLC Number:

O631
TQ332

TrendMD:

LIU Yaohua, LIN Yu, ZHANG Dongge, CHEN Chunlei, WU Guozhang, ZHANG Yan, LUAN Weiling. Fabrication of Natural Rubber/Chemically Reduced Graphene Oxide Nanocomposites and Nuclear Radiation Resistant Behavior^†[J]. Chem. J. Chinese Universities, 2016, 37(7): 1402.

Figures/Tables 11

Fig.1 TEM(A), AFM(B) images of GO nanosheet and height profile(C) of (B)

Fig.2 FTIR spectra of GO(a) and RGO(b)

Fig.3 XPS peak of GO(a) and RGO(b)(A), XPS C1s peak of GO(B) and XPS C1s peak of RGO(C)

Table 1 XPS C1s peak position and the relative atomic percentage of GO and RGO

Sample	C₁_s contribution(%)					Molar ratio of C/O
Sample	C—C(284.8 eV)		C—N(285.8 eV)	C—O(286.6 eV)	C O(287.7 eV)	O—C O(289.0 eV)
GO	47.8	0	43.1	6.5	2.6	2.2
RGO	75.1	12.1	8.1	3.4	1.3	9.9

Fig.4 SEM images of pure NR(A) and NR/RGO-0.6% nanocomposites(B)(A') and (B') are the partially enlarged images of (A) and (B), respectively. The marked regions in (B') represent the location of RGO.

Fig.5 TEM images of uncured NR/RGO-0.3%(A), uncured NR/RGO-0.6%(B), cured NR/RGO-0.3%(C) and cured NR/RGO-0.6% nanocomposites (D)The black grains in (C) and (D) are curing agents of ZnO.

Fig.6 Stress-strain curves of NR/RGO nanocomposites before irradiation(A) and after(B) γ irradiation

Fig.7 Tensile strength(A) and elongation at break(B) of NR/RGO nanocomposites before irradiation(a) and after γ irradiation dose of 200 kGy(b)

Fig.8 TGA curves of NR/RGO nanocomposites before irradiation(A) and after γ irradiation dose of 200 kGy(B)a. Pure NR; b. NR/RGO-0.18%; c. NR/RGO-0.3%; d. NR/RGO-0.6%.

Table 2 T50 of NR/RGO nanocomposites before irradiation and after γ irradiation dose of 200 kGy

Sample	T₅₀ (0 kGy)/℃	T₅₀ (200 kGy)/℃	ΔT₅₀/℃
Pure NR	378.9	374.4	4.5
NR/RGO-0.18%	381.7	377.6	4.1
NR/RGO-0.3%	383.6	381.4	2.2
NR/RGO-0.6%	385.3	384.1	1.2

Fig.9 EPR curves of pure NR(a,b) and NR/RGO nanocomposites(c,d) before irradiation(a,c) and after gamma irradiation dose of 200 kGy(b,d)

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