Modification of polyamide-6 structure by combined methods of solid-phase extrusion

Abstract

Potentialities of new combined deformation schemes, including the solid-state extrusion through conical die (ED) and equal-channel multiple angle extrusion (ECMAE) implemented in different sequences to modify the structure and properties of semicrystalline polymers, have been studied for polyamide-6 (PA-6) as an example. It is shown that deformation by the ED-ECMAE scheme gives the best complex of physical and mechanical properties. A significal improvement of elastic and strength properties of PA-6 with a conserved high level of plastic characteristics has been observed.

Polyoxymethylene orientation by equal‐channel multiple angular extrusion

“…As the accumulated deformation ε increases, microhardness of both sections of polymer billet rises and Δ H declines. Behavior of Δ H differs from the traditional variant of solid‐phase extrusion, e.g., extrusion through a conic die when Δ H increases with ε increase, too 13. Absolute values of Δ H in the case solid state extrusion through a conic die exceed the values after ECMAE even at lower accumulated deformation.…”

“…A modified variant of ECAE is equal‐channel multiple‐angular extrusion (ECMAE) that implies presence of several zones of shear deformation within one device, in contrast to ECAE 2. That is why accumulation of high plastic deformation per one cycle takes place and at the same time, high homogeneity of deformation distribution through billet section is provided 10–13. A specific feature of ECMAE is possibility of realization of combination of different deformation routes during one cycle of the process.…”

“…Earlier we have established for polyamide‐6, polyethylene of high and low density, polytetrafluorethylene that ECMAE is an effective method of structure modification of semicrystalline polymers enhancing the rigidity and the strength of the mentioned material with plasticity conserved at a high level 11–13. Besides, ECMAE provides low anisotropy of the properties at longitudinal and cross sections of the produced billets.…”

Control of the mechanical and thermal properties of semicrystalline polymers via a new processing route of the equal channel multiple angular extrusion

“…Equal‐channel multiple angular extrusion (ECMAE) seems the most promising variant of ECAE because it provides change of space orientation of shear planes, intensity and value of accumulated strain for one pass . Using ECMAE makes possible formation of unique set of properties of semicrystalline polymers: high density and deformation‐strength characteristics with the minimal anisotropy .…”

Twist Extrusion as a Potent Tool for Obtaining Advanced Engineering Materials: A Review

“…[148][149][150][151][152][153][154][155][156] This research showed that by means of TE structural features and the ensuing properties of crystalline polymers can be modified significally. Application of TE to solid-state structural modification of polymers was reported in refs.…”