Investigation of Positron Annihilation Lifetime Spectroscopy and Tensile behavior of Graphene Oxide/Epoxy Nanocomposites

Articles in Press

Document Type : Original Article

Authors

1 Department of Physics, University of Sistan and Baluchestan, Zahedan, Iran

2 Department of Materials Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran

Abstract

Positron Annihilation Lifetime Spectroscopy (PALS) is sensitive to the free volume in polymers at the atomic scale. For this reason, in recent years, this method has been used as a unique technology to measure the size of the voids forming the free volume in polymers. The PALS method, with the ability to determine the size, shape and concentration of pores, can be used as a complementary identification tool alongside other macroscopic experimental methods. In this research, PALS was employed to investigate the epoxy-matrix polymeric samples containing different weight percentages of graphene oxide (0.1, 0.3, 0.5 and 0.7%). A 22Na radioisotope with an activity of ~5 µCi was used as the positron source. Iranian fast plastic detectors (model NT-850) with a signal rise time of <2 nanoseconds were used. The time resolution of our PALS system was measured 225 picoseconds, with a 60Co radioisotope source. Uniaxial tensile tests were also performed on the samples. The results showed that the lowest free pore volume (i.e. 83.87 A3) was related to the sample containing 0.3 wt% graphene oxide, which shows a decrease of about 8% in the free pore volume in this sample compared to the pure epoxy one (i.e. 90.97 A3). With increasing the volume of pores within the sample, the tensile strength decreased. The best tensile behavior was obtained for the sample containing 0.3 wt% graphene oxide (i.e. 51.1 MPa), which showed an 18% increase in tensile strength compared to the pure epoxy sample (i.e. 43.3 MPa).

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References

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Journal of Advanced Materials in Engineering (Esteghlal)

Articles in Press, Accepted Manuscript
Available Online from 02 February 2025

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