Nanocomposites and nanomaterials
Mechanical and optical properties of polyethylene and polyvinylchloride composites with methylene blue dye
Alieksandrov M.A., Pinchuk-Rugal T.M., Dmytrenko O.P., Kulish M.P., Onanko A.P., Grabovskyy Yu.E., Strelchuk V.V.
Taras Shevchenko Kyiv National University, Kyiv, Ukraine 
E-mail: mmarafon@gmail.com

Polyethylene (PE) is the one of the most promising for wide technical applications due to its high insulation and mechanical properties, and low sensitivity to radiation treatment in comparison with other polymers. Physicochemical properties of the polymer are significantly expanded when using various fillers. Polyvinylchloride (PVC), despite a series of important physicochemical properties, such as considerable resistance against chemical agents and hydrophobic properties together with high mechanical characteristics, has a low degree of crystallinity, insufficient elasticity and frost resistance . PVC is vulnerable to destruction caused by changes in chemical structure in the course of its production and use in various processes. 
Many performance characteristics of PVC can be improved through softening, introduction of filling material and formation of polymeric composites.  For change of polymer characteristics composites with dyes are produced. 
In this work the crystal structure, degree of crystallinity, shear modulus, Young's modulus, Raman and photoluminescence spectra were investigated.
It is shown that for nanocomposites PE /dye and PVC /dye mechanical characteristics are nonmonotonic.  There is a change in the intramolecular structure, and the reorganization of the polyene sequences, which manifests itself in the displacement of the vibrational modes ν(C-C), ν (C = O), ν (CH2) in the Raman spectrum and the changes of emission centers in the photoluminescence spectra.