Which properties must a polymer have to be made into useful textile fibres?

To be suitable for manufacturing into useful textile fibres, a polymer must possess specific structural and thermal properties that allow it to be processed and provide durability in end-use applications.

Key Requirements for Fibre-Forming Polymers

• Linear Molecular Structure: Fibre-forming polymers must have a linear structure. Unlike network polymers, which are cross-linked by strong covalent bonds and cannot melt or dissolve, linear polymers can be softened by heat or dissolved in solvents, making them suitable for spinning processes.1
• Thermal Properties: A polymer must have a melting point that is high enough for practical use—such as allowing clothing to be ironed—but low enough to permit melt-spinning without causing chemical decomposition. If a polymer's melting point is too high, it must be capable of being dissolved and spun from a solution.23
• Ability to Orient and Crystallize: During the drawing process, polymer chains must be able to align along the fibre's longitudinal axis to form crystallites. This alignment increases the fibre's strength, rigidity, and chemical stability.4
• Intermolecular Forces: The polymer chains must exert sufficient attraction—such as hydrogen bonding—to hold together effectively. These forces provide the necessary cohesion for the fibre to withstand mechanical stress while remaining reversible enough under heat or solvent treatment to allow for processing.13