Parameterization of the structures arising in the deformation of elastomers
- PDF / 1,116,966 Bytes
- 6 Pages / 612 x 792 pts (letter) Page_size
- 40 Downloads / 178 Views
1859
Full Articles Parameterization of the structures arising in the deformation of elastomers A. E. Chalykh,a T. F. Petrova,a V. K. Gerasimov,a,b V. V. Matveev,a and O. V. Gorshkovaa aA.
N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Build. 4, 31 Leninsky prosp., 119072 Moscow, Russian Federation. Fax: +7 (495) 952 5308. E-mail: [email protected] bPlekhanov Russian University of Economics, 36 Stremyannyi per., 117997 Moscow, Russian Federation The phase structure of synthetic isoprene rubber samples subjected to stretching was studied by transmission electron microscopy. A procedure for determining the fractal dimension of extended one-dimensional structures arising during deformation was proposed. Image parametrization, being the extraction of substantial acting parameters, their description, and quantitative estimation of the obtained parameters, made it possible to characterize each stage of the deformation. A combination of standard methods of studying electron microscopic images using the fractal theory to describe the supramolecular and phase structures of elastomers allows one to understand the mechanism of the deformation process and the nature of the structures arising in structure rearrangement. Key words: phase structure of elastomeric materials, fractals, parameterization, deformation of elastomers, transmission electron microscopy.
The procedures of parametrization of the supramolecular structure of heterogeneous systems formed by filler particles in polymeric matrices, disperse phases in gels, and one-dimensional objects (carbon nanotubes and fibers) in composite materials have previously been developed in our1—4 and other works.5,6 It is shown that a quantitative information about the fractal dimensionality of the structures and the mechanism of their formation and transformation under conditions of various external effects (thermal annealing, vulcanization, flow, and irradiation) can be obtained for all these materials. The microimages illustrating the morphological rearrangements of montmorrilonite nanocrystals during flow of the filled
melt of polypropylene (PP) obtained by transmission electron microscopy on thin sections are shown in Fig. 1. Evidently the processing of these images to obtain an information about the fractal structure of dispersed systems should be based on both different scales of organization of the disperse phase particles and development of procedures for imaging and image processing of the structures formed during the deformation of the material as a whole. In order to accomplish this approach, we performed a special study of the structural morphological rearrangements during elastomer deformation. From the experimental point of view, the most successful object for similar studies is cis-polyisoprene (SKI) that crystallizes
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 1859—1864, October, 2020. 1066-5285/20/6910-1859 © 2020 Springer Science+Business Media LLC
1860
Chalykh et al.
Russ. Chem.
Data Loading...
