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How do polymers make man-made fibres possible?
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man-made fibre
Figure 1: Three common polymer structures. The linear, branched, and network architectures are represented (from top), respectively, by high-density polyethylene (HDPE), low-density polyethylene (LDPE), and phenol formaldehyde (PF). The chemical structure and molecular structure of highlighted regions are also shown.
Polymers make man-made fibres possible because they consist of long, chainlike molecules of great size and molecular weight, which provide the necessary physical propertiesāsuch as strength, toughness, and the ability to be formed into filamentsāthat distinguish them from simpler molecules.12
The process of creating these fibres relies on the unique characteristics of these long-chain molecules:
- Spinning: Polymers are converted into a liquid or molten state, which allows the long molecules to move independently. This liquid is then extruded through a spinnerette to form solid filaments.3
- Drawing: Once spun, the filaments undergo a process called drawing, where they are stretched to pull the polymer chains into alignment along the fibre's longitudinal axis. This alignment allows the molecules to pack closely together into crystallites, which develop cohesion and significantly increase the fibre's strength and rigidity.4
- Tailored Properties: Because polymers can be engineered or regenerated, manufacturers can control their chemical structure to achieve specific performance requirements, such as heat resistance, moisture absorption, or elasticity.15
By manipulating these molecular structures, scientists can mass-produce fibres with precise characteristics for diverse industrial and consumer applications.16