The effect of carbon nanotubes on the curing process and the strength of epoxy resin

A.M. Ermakhanova; M.B. Ismailov

doi:10.31643/2018/6445.36

Authors

A.M. Ermakhanova “National Centre for space research and technology” JSC
M.B. Ismailov JSC “National Center for Space Research and Technology”

DOI:

https://doi.org/10.31643/2018/6445.36

Keywords:

epoxide resin, carbon nanotubes, modification, geltime, strengthening.

Abstract

The influence of carbon nanotubes of “Taunit-M” of various modifications (carboxylated, carboxyl-hydroxylated, amidated) on the viscosity of the liquid state, gelation, and the strength of the cured epoxy resin “Inject-T” was investigated. For the first time it was found that the introduction of carbon nanotube in epoxy resin at 25 °C increases the viscosity by 4-55 %, at 50 °C it increases by 5-52 %, at 70 °C – by 6 %. The most discernable effect on the viscosity of epoxy resin is obtained for amidated carbon nanotubes. Gel time at 150 °C epoxy resin was 6.3 minutes, with the introduction of carbon nanotube increased to 11.3-13 minutes. Increasing pot life is very important for the technology of using epoxy resin. The first 3 minutes of gelation of the epoxy resin were studied, while the energy loss modulus of the epoxy resin gel without carbon nanotubes monotonically increases over time from 0 to 0.05 MPa, with the introduction of carbon nanotube into the epoxy resin, the loss modulus increases within the first 1-2 minutes from the start of the gel time to the values of 0.14-0.38 MPa (depending on the modification of carbon nanotube), then falls sharply. This means that after the gel time the carbon nanotubes substantially accelerate the process of solidification of the epoxy resin. The strength of the cured epoxy resin was 172 MPa, the introduction of carbon nanotubes increased the strength to 210 MPa. Thus, the introduction of carbon nanotube in epoxy resin slightly increases its viscosity in the liquid state, substantially prolongs the gelation time, accelerates hardening from the moment of gelling, increases the strength of the cured epoxy resin.

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Author Biographies

A.M. Ermakhanova, “National Centre for space research and technology” JSC

Master of degree, “National Centre for space research and technology” JSC, Almaty, Kazakhstan.

M.B. Ismailov, JSC “National Center for Space Research and Technology”

Director of the Department of Space Materials Science and Instrumentation at JSC “National Center for Space Research and Technology”, Almaty, Kazakhstan.

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