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Е. А. Лисенков, В. В. Клепко
«Особливості мікроструктури систем на основі поліетерів і вуглецевих нанотрубок»
203–219 (2016)

PACS numbers: 61.41.+e, 61.43.Hv, 61.46.Bc, 61.46.De, 68.37.-d, 73.63.Fg, 82.35.Np

The investigation of the microstructure features of systems based on polyethers and carbon nanotubes (CNT) is carried out using the method of optical microscopy. As revealed, in the investigated systems, the typical percolation transition is observed at some threshold CNT concentration (0.45%). During this process, CNT or their aggregates form a net, which permeates all the bulk of the probed material. As discovered, for all the investigated polyether matrices, which are different on the nature, the macrodispersion indexes are almost identical. This fact testifies to the similar aggregation processes, which occur in these systems. As revealed, the maximal size of aggregates changes rapidly in the concentration range from 0.3% to 0.5%. Such effect is related to the percolation transition and is explained by the ‘continuous’ cluster formation in this range of CNT concentrations. The structure of the polyether–CNT systems has the scaling behaviour, and it is possible to describe their property within the scope of fractal or scaling approach. As discovered, the introduction of modifier changes the fractal dimension of the polyether–CNT system considerably. It is routine that the phase structure of CNT aggregates changes depending on the type and time of mixing. If time of the ultrasonic mixing is equal to 30 s, the percolation net of filler is formed as two ‘quasi-phases’ with the developed and dense surfaces. As shown, the introduction of third component leads to both the increase of fractal dimension of the systems and the loosening of CNT aggregates. As discovered, the CNT functionalization results in higher dispersity of nanotubes in a polymeric matrix, however, it leads to the increase of the percolation threshold.