Abstract
The fibers based on thermoplastic partially crystalline polyetherimide R-BAPB modified by vapor grown carbon nanofibers (VGCF) were prepared by melt extrusion, exposed to orientational drawing, and crystallized. All of the samples were examined by scanning electron microscopy, X-ray scattering, and differential scanning calorimetry to study how the carbon nanofiller influences on the internal structure and crystallization behavior of the obtained R-BAPB fibers. The mechanical properties of the composite R-BAPB fibers were also determined. It was found that VGCF nanoparticles introduced into R-BAPB polyimide can act as a nucleating agent that leads, in turn, to significant changes in the composite fibers morphology as well as thermal and mechanical characteristics. VGCF are able to improve an orientation degree of the R-BAPB macromolecules along the fiber direction, accelerate crystallization rate of the polymer, and enhance the fiber stability during crystallization process.
Highlights
Polyimides (PI) are a class of polymers with imide rings in the main chain, which can be aliphatic, aromatic, or semi-aromatic in composition [1,2]
The solution is passed through a coagulation bath with a precipitant in which the solvent is removed and the prepolymer is precipitated in the form of a fiber [12]
The purpose of this work was a detailed study of changes in the structure and a number of different properties of the fibers based on crystallizing polyimide R-BAPB modified by vapor grown carbon nanoparticles (VGCF), followed by orientational thermal drawing, as well as additional heat treatment leading to crystallization of the polymer matrix
Summary
Polyimides (PI) are a class of polymers with imide rings in the main chain, which can be aliphatic, aromatic, or semi-aromatic in composition [1,2]. On the basis of PI, films, coatings, varnishes, composites, binders, and foams are obtained [5] They can be spun into fibers with exceptional technological and operational properties [6]. Dry spinning involves passing a solution of polyimide or its prepolymer through a spinneret and blowing hot air on the forming fiber to remove the solvent, followed by heat treatment [11]. The solution is passed through a coagulation bath with a precipitant in which the solvent is removed and the prepolymer is precipitated in the form of a fiber [12]. Extrusion of thermoplastic polyimides from a melt is more preferable, since it excludes the use of solutions, coagulation bath, and additional processing in order to remove volatiles and achieve thermal imidization of fibers [14]. By introducing flexible ether units into polymer chains, a number of polyetherimides have been synthesized, which made it possible to process them by melt extrusion [16]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
