Comparative analysis of the structural parameters and strength properties of polyacrylonitrile fibers containing ceramic nanoadditives

Abstract

ABSTRACT:The structural parameters and strength properties of three types of new-generation precursor polyacrylonitrile fibers are comparatively analyzed. These fibers, after the carbonization process, can be used as implants supporting the process of bone reconstruction. They are characterized by a high tenacity ranging from 21 to 41 cN/ tex. Tests and measurements have shown that the presence of nanoadditives causes a clear increase in the degree of fiber crystallinity. Moreover, the tenacity of the fibers can be considerably increased by the grinding of nanoadditive agglomerates with ultrasound.

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

“…In the case of incorporating montmorillonite, an essential importance has the presence of the exfoliation phenomenon of the monmorillonite packets, and their orientation in relation to the fiber axis. As we stated in our previous works, 7,12 the reconstruction of the PAN fibers' crystalline structure connected with the nucleation action of the nanoaddition, hydroxyapatite in this case, also influences advantageously the possibility to obtain good tensile strength properties of these fibers.…”

“…6 In the case considered, they depend not only on the process parameters of solidification and drawing, which are usual for such fibers, but also on the kind and amount of the nanoaddition inserted. 7 In the majority of cases, incorporating a nonfiber-grade nanoaddition is connected with decreasing the fiber-matter's ability to deformation processes at the stage of drawing. [8][9][10] Conducting the solidification process under conditions advantageous for formation of a porous structure resulted in obtaining a higher total volume of the pores, and at the same time lowered the tensile strength properties in comparison to PAN fibers without any nanoaddition.…”

The structure and properties of the carbon non-wovens modified with bioactive nanoceramics for medical applications

“…11. As one can see, they differ considerably from the typical diffraction patterns of carbon fibers produced from PAN precursor which are used for strengthening purposes in the composite technology [27][28][29][30]. These differences indicate that some ordered structures are present in the examined samples, however, the characteristic turbostratic structure of PAN-based carbon fiber is not developed yet.…”

PAN‐based fibers modified with two‐component ceramic nanoparticles

“…This phenomenon was described in Ref. 18, which concerns a comparative analysis of the structural parameters of PAN fibers characterized by different nanoadditives (SiO 2 , Hap, and MMT). Considering the influence of the presence of two nanoadditives in the fiber matrix of PAN fibers on their tensile strength properties, the following facts should be taken into account.…”

“…It is also well known that obtaining increased tensile strength properties is connected with the phenomenon of exfoliation of MMT layers and their orientation in line with the fiber axis. 18 Furthermore, the authors conducted SEMþEDS tests aimed to detect the presence of the nanoadditives introduced to fiber matrix on the surface of polyacrylonitrile fibers. Moreover, on the basis of these tests, the authors also tried to assess the regularity of distribution of particular nanoadditives on the fiber surface.…”