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S. A. Udra
Moscow State University
Shear ratePolyacrylonitrileCritical resolved shear stressShear modulusChromatography
3Publications
1H-index
5Citations
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Publications 3
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#1S. A. Udra (MSU: Moscow State University)H-Index: 1
#2V. I. Mashchenko (MSU: Moscow State University)H-Index: 1
Last. V. I. Gerasimov (MSU: Moscow State University)H-Index: 4
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The effect of shear fields on the rate of physical gelation in semidilute solutions of ultra-high-molecular-weight polyacrylonitrile in propylene carbonate and on the structural features of the resulting gels has been studied. At 30–70°C in the uniform shear field, the induction period of gelation decreases from several hours to several seconds with an increase in the shear stress. The patterns of these dependences are rather close at shear stresses above 20 Pa, while significant differences are...
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#1S. A. Udra (MSU: Moscow State University)H-Index: 1
#2L. A. Kazarin (MSU: Moscow State University)H-Index: 1
Last. V. I. Gerasimov (MSU: Moscow State University)H-Index: 4
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Structural rearrangements in solutions of high-molecular-mass polyacrylonitrile in propylene carbonate upon phase separation were studied and quantitatively characterized by means of turbidity spectroscopy and oscillation rheometry with the use of previous data obtained via the light transmission technique. The kinetic features of separation of the new phase and the particle size growth were established. It was shown that there is a time lag between the onset of physical-gel formation in the sys...
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A new system of liquid-crystal composites has been obtained, consisting of a porous polyacrylonitrile gel with the low-molecular-weight nematic liquid crystal (LC) N-(4-methoxybenzylidene)-4-butylaniline introduced into the pores. The optical properties of the LC composites have been studied as a function of the temperature and the pore size of the polymeric material. It is shown that the LC composites remain opaque all the way to the mesophase?isotropic-melt phase-transition temperature, wherea...
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