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Akimova A.A.,Balakov Institute of Mechanics | Murina A.S.,Balakov Institute of Mechanics | Panova L.G.,Engels Institute of Technology | Biryukov V.P.,Balakov Institute of Mechanics
Fibre Chemistry | Year: 2011

Results are presented from studies of the change in the internal stress of a polyacrylonitrile fiber during heat treatment. It is shown that the increase in stress during deformation and heat treatment and its decrease during relaxation can be explained by representing the structure of the polymer in the form of stable and unstable grids superimposed on one another. The sub-units of the grids are formed by chains of the amorphous phase, the stable nodes are formed by crystallites and chemical bonds, and the unstable nodes are formed by microscopic blocks of the amorphous phase and van der Waals interactions. © 2011 Springer Science+Business Media, Inc. Source


Akimova A.A.,Balakov Institute of Mechanics | Murina A.S.,Balakov Institute of Mechanics | Panova L.G.,Engels Institute of Technology | Biryukov V.P.,Balakov Institute of Mechanics
Fibre Chemistry | Year: 2011

It is proposed that the Wiechert model be used to describe the structure of a polyacrylonitrile (PAN) fiber. The model which is used includes a Hookian element and two Maxwellian elements with variable parameters. The temperature dependence of the parameters of the model are determined. The proposed method can be used to analyze and describe the structure of the fiber on the basis of indirect parameters and to predict the fiber's behavior during its deformation and heat treatment. In particular, the method can be used to determine the optimum elongation of a PAN fiber during its thermal stabilization as part of the process of carbon fiber production. © 2011 Springer Science+Business Media, Inc. Source

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