Nanocomposites and nanomaterials

Heat conductivity of penton filled by 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

Inspite of the set of positive characteristics inherent of carbon nanotubes, their performance characteristics in most cases does not allow them to be used in difficult weather conditions and aggressive environments. Additional complicating factor of their use is also high cost of products on their basis. In this regard, it is important to develop new materials that are resistant to the external environment at a relatively low cost. Such materials are polymer composite materials, in which carbon nanotubes are used as disperse filler, and chemically stable polymers as a polymer matrix. 
Purpose of this work is ascertainment of active fillers influence on heat conductvity of polymer composite materials based on highly stable and chemically resistant high-molecular polyether – penton (3,3-bis(chloromethyl) oxacyclobutane).
As fillers were used acid cleaned from mineral impurities multi-walled carbon nanotubes 10 ÷ 40 nm OD, with specific surface about 200 ÷ 400 m2/g and with specific electrical resistance about 0,05 ÷ 0,1 ohm∙сm.
Penton - multi-walled carbon nanotubes system specimens were prepared at following thermo-baro-time (T-p-t) condition: heating rate 3,5 K/min, aging at 483 K pending 15 min under pressure of 20 MPa, cooling from melt with 0,5 K/min rate, what correspond to better technological conditions of composite recycling with taking account of filler and polymer matrix properties.
Investigations of PCM’s heat conductivity temperature dependences were conducted by the dynamic λ-calorimeter that was the modernized thermal conductivity meter “ИТ--400” in 293 - 493 K temperature rate for different disperse fillers volume content (0 ≤ φ ≤ 2 %).
It was found, that penton - multi-walled carbon nanotubes system composites are characterized by the mutual influence of the components of the system, which indicates their active interaction, which, in turn, positively affects the value of the thermal conductivity coefficient of the products while retaining strength characteristics.