Nanocomposites and nanomaterials

Relaxation properties of penton filled by silver iodide and multi-walled carbon nanotubes
H.V. Rokytska, M.I. Shut, M.O. Rokytskyi, A.M. Shut
Faculty of Physics and Mathematics, National Pedagogical Dragomanov University, Ministry of Education and Science of Ukraine. Pirogova Str., 9, Kyiv-01601, Ukraine.
E-mail: galina-darla@ukr.net

The development of science and technology, including space requires continuous improvement and miniaturization of equipment used. In this regard, there is a need to learn and use new structural materials with completely new properties. Prominent representatives of such materials which are intensively studied and widely used, are multi-walled carbon nanotubes. With all the complex of positive characteristics inherent to carbon nanotubes their performance characteristics, in some cases, do not allows to use them in difficult weather conditions and corrosive environments. In this regard, it is urgent to develop new materials that would be resistant to the external environment and not lose its properties. These materials can be polymeric composite materials, in which carbon nanotubes are used as particulate filler, and chemically resistant polymers used as polymer matrix.
Purpose of this work is ascertainment of active fillers influence on relaxation properties of polymer composite materials based on highly stable and chemically resistant high-molecular polyether - penton. As fillers were used acid cleaned from mineral impurities multi-walled carbon nanotubes (MWCNT) 10 ÷ 40 nm OD, with specific surface about 200 ÷ 400 m2/g and with specific electrical resistance about 0,05 ÷ 0,1 ohm∙сm.
It has been shown that calorimetric method of analysis of relaxation processes can be used also to polymer nanocomposites which includes polymers able to crystallization, namely, high-molecular polyesters and multi-walled carbon nanotubes. Penton - MWCNT system taken as example, the analysis of composites dcp/dT multiplet dependence, whose shape is caused by structure-active silver iodide particles occurrence, in glass transition temperature range, have been carried out and their relaxation characteristics complex have been determined. 
Thereby, the investigations of temperature dependences of system composites specific heat capacity display multipletіс character of glass transition of polymer matrix and allowed to physically grounded execute the division of observed in α- and α'-relaxation transitions range and separately determine their relaxation characteristics complex.