Maximum Swelling of the Surface of the Composite Material

Komarova, Liudmila; Baidakova, N. V.

doi:10.4028/www.scientific.net/msf.1031.1

Cited by 1 publication

(4 citation statements)

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“…The tangent of the angle of the inclined straight line in these coordinates will correspond to the swelling rate constant k, min −1 [ 12 ].…”

Section: Resultsmentioning

confidence: 99%

“…The deformation of the samples under the action of a fixed constant stress (0.8 MPa) was measured using a modified thickness gauge [ 12 ] and using a laboratory stand with stress sensors [ 19 ]. The elastic modulus E was calculated according to ISO 7743-2013.…”

Section: Methodsmentioning

confidence: 99%

“…To assess the strain relaxation of the ORFB, the initial and extremely swollen samples were compressed using a TIB-1 thickness gauge under a load of 0.8 MPa for 5 seconds (t 5 ), after which the load was removed and the blanket recovery was recorded within 5 seconds (t 10 ). The entire process of the changing of the thickness was continuously recorded using video recording tools, followed by the framing and establishment of changes in the structure and thickness of the composite according to the methods [ 12 , 20 ].…”

Section: Methodsmentioning

confidence: 99%

“…Previously, the swelling of monolithic polymer plates (printing plates which are widely used in the flexographic printing method) in solvents of various chemical compositions was studied, followed by a mathematical analysis of the sorption kinetics [ 11 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

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Compression Relaxation of Multi-Structure Polymer Composites in Penetrating Liquid Medium

et al. 2022

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Multi-structural polymer composites are widely used in the mechanical engineering, automotive, aviation and oil refining industries, as well as in the printing industry as a shock-absorbing deckle on the offset cylinders of printing machines. During offset printing, composites come into contact with inks and washing solutions, the components of which penetrate the material and cause the polymers to swell. This process degrades the print quality, and for this reason the study of its features is relevant. The prerequisites for this work are the study of the fundamental laws of diffusion and sorption of liquids by polymers with different micro- and macro-structures in different physical states and in different forms (e.g., films, sheets, fibers and fabrics). The combination of polymer materials in the composition of multi-structural fabric blankets makes it possible to obtain materials with unique mechanical properties and high resistance to liquid penetrating media and to use them in high-tech processes of multi-color printing with high resolution and color rendering. This article reports for the first time the kinetics and thermodynamics results obtained from the swelling of multi-structural polymeric blankets in solvents used in printing, and the effect of sorption of different polar liquids on the viscoelastic strain under compression during the operation of the damping systems of printing machines. Using mathematical models of activated liquid diffusion in polymers and deformation of a viscoelastic body, the swelling rate constants, solvent diffusion coefficients (the kinetic characteristics of the swelling process) and Flory–Huggins parameters (the thermodynamic characteristics of the interaction of the solvent with the composite) for composite–solvent systems with several chemical composition variants were determined. The elastic modulus and the viscosity coefficient of the composite under liquid saturation were calculated based on the experimental cyclic compression data. The range of change in the compression and restoration times of the polymeric blankets (0.09 s ÷ 0.78 s) was determined. It was shown that the composite swelled to a limited extent in all the studied liquids. All solvents used were thermodynamically poor (χ > 0.5). It has been established that rubber–fabric blankets coated with nitrile rubber are the least resistant to the action of dichloroethane, and that blankets with layers of polyolefins are not resistant to ethyl acetate. Water significantly affects the physicochemical properties of rubber–fabric blankets with a large proportion of cotton fabric layers. The data obtained can serve as a basis for optimizing the compositions of inks and cleaning solutions, as well as a theoretical basis for the thermodynamics of composite–solvent systems.

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“…The tangent of the angle of the inclined straight line in these coordinates will correspond to the swelling rate constant k, min −1 [ 12 ].…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%