Processing, Structure and Properties of Nanocarbon/Polyamide Nanocomposite Fibres

Abstract

This study explores the fabrication and characterization of nylon nanocomposite fibres reinforced with various carbon-based nanofillers, focusing on their structural, mechanical, thermal, electrical, and multifunctional properties. Wet-spinning and melt-spinning techniques were employed to produce fibres filled with GNPs, rGO, CB, and MWCNTs, allowing comparative evaluations of the effects of nanofiller dimensionality, aspect ratio, surface chemistry, and post-processing treatments. Wet-spun fibres revealed the significance of the washing process in removing ions from Li2SO4 coagulation baths, with GNPs and rGO systems exhibiting distinct behaviours due to their filler characteristics. The role of filler dimensionality was also highlighted, with CB (0D), MWCNTs (1D), and GNPs (2D) yielding varying impacts on fibre properties. Melt-spun fibres, reinforced with MWCNTs and GNPs, demonstrated improved multifunctionality, with post-treatments such as annealing and cold drawing effectively tuning their structural and functional attributes. Finally, melt-spun nylon/MWCNT fibres were evaluated as strain sensors, showcasing excellent electrical conductivity and strain sensitivity, with post-treatments further enhancing their performance. This work provides a comprehensive understanding of the interplay between nanofiller properties, fabrication methods, and post-treatments, paving the way for tailoring advanced nylon nanocomposite fibres for specific applications in multifunctional materials and smart textiles.

Date of Award	31 Mar 2025
Original language	English
Awarding Institution	The University of Manchester
Supervisor	Cristina Valles (Main Supervisor), Arthur Wilkinson (Co Supervisor) & Ian Kinloch (Co Supervisor)