In the present paper the effect of the thermoexfoliated graphite (EG) content (0–0.310 parts by volume), constituent mixing
conditions (a paddle mixer or a disk-and-screw extruder), annealing and aging on thermodestruction processes of polypropylene
(PP)/exfoliated graphite composite materials (CM) by means differential thermal analysis and the thermogravimetric method
have been investigated. The studies have shown that thermodestruction processes in CM based on PP and EG ran in air for expense
of PP thermodestruction. The characteristics of thermodestruction in CM essentially depend on a regime of making and concentration
of components. It is established that processes leading to the formation of less perfect crystalline structures or causing
amorphization of PP (including formation of continuous space structures from EG particles, cluster traps) advances thermodestruction.
The increase in crystallinity extent of PP favors to the decrease in thermodestruction processes.
Authors:L. Semko, L. Dzyubenko, V. Ogenko, and S. Revo
Composite materials (CM) based on poly(ethylene) (PE) and nanocrystalline nickel (Ni) have been produced. The effect of the
content of nanocrystalline Ni and processes of structure formation of its particles on a melting temperature (Tm), interval of melting, true melting heat (ΔHm), degree of crystallinity (χ) as well as characteristics of CM thermodestruction have been determined by DTA and thermogravimetry
techniques. It was found that these characteristics are changed non-linearly when the content of nanocrystalline Ni increases.
The most efficient influence of Ni on the above mentioned characteristics was observed for its low content (0.01 volume part
of Ni). It was shown that a formation of a branched multifractal cluster of nickel above a percolation threshold favored a
decrease in Tm, ΔHm, χ of filled PE and a majority of thermal characteristics of CM thermodestruction as well.