2014 (3) 6

Effect of the nanofillers with different isometry on the thermophysical and relaxation properties of epoxy polymer

V.V. Korskanov, V.V. Klepko, I.L. Karpova

Institute of Macromolecular Chemistry NAS of Ukraine

48, Kharkivske shose, Kyiv, 02160, Ukraine

Polym. J., 2014, 36, no. 3: 262-268.

Section: Structure and properties.

Language: Ukrainian.

Abstract:

The nanocomposites (NC) based on epoxy resin (ER) and carbon nanotubes (CNT’s) and NC based on ER and aerosil (AE ) was investigated by differential scanning calorimetry.  Was discovered  the different nature of the influence of highly anisometric nanoparticles CNT’s (ratio of length to dіameter more than 50) and isometric spherical nanoparticles on the thermal properties of the AE and the thermodynamics of the formation of nanocomposites. Decreasing of the glass transition temperature , the characteristic relaxation time and the fragility of the nanocomposites based on epoxy resin (ER) and carbon nanotubes (CNT’s) are the result of incomplete crosslinking of the polymer matrix due to steric barriers in the form of nanoparticles CNT’s. High adhesion of aerosil (AE ) to the ER increases the glass transition temperature nanocomposites EP–AE, characteristic relaxation time and fragility. It was established that the maximum energy of interaction between the components of the nanocomposites (with mass content nanofiller w = 0,1–0,3% for ER–CNT’s and w = 0,3–0,4% for ER–AE) corresponds to the saturation of all contacts between polymer and nanofillers.

Key words: epoxy polymer, carbon nanotubes, aerosil, relaxation properties, fragility.