Influence of the amount of ferromagnetic addition on the rheological properties of spinning solutions, the structure, the strength, and thermal properties of polyacrylonitrile fibres

Abstract

ABSTRACT:The rheological properties of spinning solutions of polyacrylonitrile in dimethyl formamide (DMF) containing various amounts of a ferromagnetic nanoaddition were investigated. The porous structure, the strength and thermal properties of fibers obtained from these solutions were assessed, as well as the uniformity of the nanoaddition distribution on the fiber surface was estimated.

Effect of ceramic nanoadditive content and type on the rheological properties of poly(vinyl alcohol) spinning solutions

“…A similar character of changes in the parameters n and k was found by us in the case of solutions of other fiber‐forming polymers containing ceramic,26 ferromagnetic29 nanoadditives.…”

“…The used concentrations ranged from 18.5 to 21%. The polymer content in the solution cannot be too high as, according to our previous studies,29 the presence of nanoadditives in the solution was in some cases accompanied by an increase in its apparent dynamic viscosity.…”

Effect of spinning conditions on the mechanical properties of polyacrylonitrile fibers modified with carbon nanotubes

“…10,17,19 Our previous studies have shown that different ceramic and metallic nanoparticles influence the rheological parameters of the spinning solution, the mechanism of solidification of the PAN fiber, and the deformation process during the drawing stage. [20][21][22] The rheological properties of the spinning solution may influence the stability of the formation process, and the possibility of the occurrence of capillary disintegration or brittle (cohesive) failure. These properties also affect the rate distributions of the liquid flow through the spinneret ducts, the relaxation processes outside the spinneret zone, and the longitudinal rate gradient along the formation pathway, which influence the structural orientation of fiber elements.…”

“…Limited property improvement in polymer/CNT composites was observed in the presence of chaotically oriented CNTs 10, 17, 19. Our previous studies have shown that different ceramic and metallic nanoparticles influence the rheological parameters of the spinning solution, the mechanism of solidification of the PAN fiber, and the deformation process during the drawing stage 20–22. The rheological properties of the spinning solution may influence the stability of the formation process, and the possibility of the occurrence of capillary disintegration or brittle (cohesive) failure.…”