Electrical conductivity, mechanical and optical properties of polyamide 6 composites with methylene blue dye
Popruzhko V. M.1, Pinchuk-Rugal T.M.1, Dmytrenko O.P.1, Kulish M.P.1, Onanko A. P.1, Strelchuk V.V.2, Kolomys О.F.2, Alieksandrov M.A.2
1 Taras Shevchenko Kyiv National University, Kyiv, Ukraine. 
64/13, Volodymyrska Street, City of Kyiv, Ukraine, 01601. 
E-mail: pvm13031997@gmail.com
2 National Academy of Science of Ukraine, 
V.E. Lashkaryova Institute of Semiconductor Physics NAS of Ukraine. 
03028 Ukraine, Kyiv, 45, Nauky pr.

Polyamide 6 (PA6) has an excellent properties such as hydrogen bone in molecular chains of the polyamide which makes it one of the major engineering and high performance plastic [1]. Methylene blue (MB) is a heterocyclic aromatic compound containing a thiazine ring, and has many applications in microbiology, medicine and diagnostic fields [2]. 
Physically-mechanical properties of polyamide can be improved by creating composites filled with methylene blue.
In this work the electrical conductivity, shear modulus, Young's modulus, Raman and photoluminescence spectra of PA-MB nanocomposites were investigated. It is shown that for nanocomposites PA/MB with the increasing concentration of the modifier, the electrical conductivity of composites increases by almost an order of magnitude, contact phenomena are dominant. Mechanical characteristics are nonmonotonic. There is a change in the intramolecular structure. Emission centers in the photoluminescence spectra are shifted, fig.1.

Fig.1. Photoluminescence of PA 6 (λex=325 nm, T=293 K).

1.	Farizah Hamid et.al., Procedia Engineering - 2013, 68. -P. 418 – 424.
2.	Chunying Li et.al., Food Control – 2016, 65. -P. 99 – 105.