On the positron annihilation spectroscopy and tensile behavior of COOH-MWCNT/epoxy nanocomposites
Publish Year: 1403
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JPST-10-1_006
تاریخ نمایه سازی: 24 مهر 1403
Abstract:
Positron Annihilation Lifetime Spectroscopy (PALS) is sensitive to the material voids/free volume on the atomic scale. For this reason, this method has been used as a unique technology to measure the free volume and structural defects in polymers in recent years. In the present study, epoxy-matrix nanocomposites with different carboxylic acid functionalized multiwalled carbon nanotubes (COOH-MWCNTs) loadings (۰.۱-۰.۷ wt% at a step of ۰.۲) were fabricated, and the influence of COOH-MWCNTs loading on the prepared nanocomposites' free volume properties and tensile behavior were explored. The measurement of positron annihilation lifetime was done using a conventional synchronization system based on a ۲۲Na radioactive source with ۷ μCi activity. The detectors used in this work were fast plastic scintillators (type: NT-۸۵۰) with ns time response. The results demonstrated that the tensile strength of the nanocomposites decreased with the increase in the lifetime of the ortho-positronium annihilation (increase in the radius and free volume) in the samples. The ۰.۳ wt% COOH-MWCNTs/epoxy nanocomposite showed the maximum tensile strength. Overall, the results of this work clearly revealed that there was a strong relationship between the tensile strength and free volume in the polymer nanocomposites.
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Authors
Mohammad Koohkan
Department of Physics, University of Sistan and Baluchestan, Zahedan, Iran
Ali Akbar Mehmandoost Khajeh-Dad
Department of Physics, University of Sistan and Baluchestan, Zahedan, Iran
Hamed Khosravi
Department of Materials Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran
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