Influence of the spinning conditions on the structure and properties of polyamide 12/carbon nanotube composite fibers

Abstract

The inclusion of nanoparticles in polymer fibers is potentially useful for improving or bringing new properties such as mechanical strength, electrical conductivity, piezoresistivity, and flame retardancy. In this study, composite fibers made of polyamide 12 and multiwall carbon nanotubes were investigated. The fibers were spun via a melt-spinning process and stretched at different draw ratios. The influence of several spinning factors, including spinning speed, extrusion rate, and draw ratio were investigated and correlated to the structure and properties of the fibers. X-ray diffraction analyses and mechanical tests indicated that the spinning speed barely affected the structure and mechanical properties of the fibers under tension. The spinning speed, however, is critical for future industrial applications because it determines the possible production rates. By contrast, drawing during spinning or after spinning strongly affected the polymer chain alignment and fiber mechanical properties.

Structure–property relationship studies in amine functionalized multiwall carbon nanotubes filled polypropylene composite fiber

“…In contrast, p‐MWNT based composite fiber could not be drawn beyond a critical value of DR largely due to the less interfacial interaction between p‐MWNT and PP. In contrast, PA12/MWNT composites exhibited higher tensile modulus at 5 and 7 wt% MWNT with increase in orientation factor, which was achieved through the use of hot drawing using tensile tester device [30]. Moreover, it is also expected that the state of dispersion of a‐MWNT would be better as compared to p‐MWNT in the corresponding composites in the current context.…”

Effects of Carbon Fillers on Crystallization Properties and Thermal Conductivity of Poly(phenylene sulfide)

“…They also show a uniquely high thermal conductivity of 2800-6000 W/ mK at room temperature [1,2] , which is greater than those of graphite and carbon fibers. It has been reported that CNT acts as an efficient nucleating agent on polymers, including polypropylene (PP) [3,4] , nylon [5,6] , poly(phenylene sulfide) (PPS) [7][8][9] , and polyolefins [10] , and accelerates the crystallization process. It has been observed that the crystallinity of polymer has a very important influence on the thermal performance.…”

Impact of Filler Functionalisation on the Crystallinity, Thermal Stability and Mechanical Properties of Thermoplastic Elastomer/Carbon Nanotube Nanocomposites

“…A significant improvement of the storage modulus (+40%) was achieved by the dispersion of MWCNT‐OH in the PBT‐PTMO matrix. To our knowledge there are few examples of polymer nanocomposites based on commercially available polymeric matrices [namely poly(vinyl alcohol), poly(methyl methacrylate) or polycarbonate], which exhibit such an improvement in mechanical properties 67–71…”