Abstract
The increase of irradiation temperature by gamma-rays of emulsion isoprene nitrile elastomer in the range of 298-423 K is accompanied by the significant increase of crosslinking rate and strength deterioration of unfilled cures at the same time. By the method of sol-gel analysis, the output dependences of the mesh chains (1/Mc), cross-linked molecules (1/Mƞt) and crosslinks (nc) for isoprene nitrile elastomer are determined between 298 and 423 K. The influence of acrylonitrile content of elastomer group during the process of irradiation and temperature on density change of curing grid using Fourier spectroscopy is established. It also studied the molecular structure of isoprene nitrile elastomer and unsaturation at irradiation and temperature (423K, 500 kGy).
Highlights
It is known that exposure of elastomers under high intensity radiation may be accompanied by a significant rise of samples temperature [1,2,3,4,5,6,7]
It is known that the radiation-chemical yield of cross-linking and formation of effective transverse chemical bonds in butadiene nitrification elastomers depends on the dose power and the absorbed dose
The increasing of irradiation temperature up to 423 K decreases the mechanical properties of cures, which contributes a significant drop of unsaturation and at the same time the crosslinks output increases rapidly
Summary
It is known that exposure of elastomers under high intensity radiation may be accompanied by a significant rise of samples temperature [1,2,3,4,5,6,7]. It is known that the radiation-chemical yield of cross-linking and formation of effective transverse chemical bonds in butadiene nitrification elastomers depends on the dose power and the absorbed dose. It was established that in presence of oxygen environment the radiation-chemical yield of cross-linked molecules increases 1.5 times, along with this the crosslinks depends on the nature of elastomer. Systematic relationship study of radiation-chemical changes (crosslinking, degradation, and change in the yield of crosslinks, mesh chains number, viscosity, sol fraction, and the change in the content of double bonds) and the characteristics of the physical and mechanical properties of elastomers under the heat and radiation exposure have not been conducted up to present. The experiments result in the effect of temperature on radiation crosslinking of isoprene nitrile using a sol-gel method of analysis based on the laws of the static theory of nets structure
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