Polymer Classification
Organic polymers extracted from plant sources like wood pulp or cotton linters define this classification. A cellulosic fiber contains beta-glucose units linked to form a long chain that provides structural integrity to the plant. Because the hydroxyl groups on these chains attract water, the resulting textiles exhibit high moisture regain.
Clothing made from these fibers stays comfortable against the skin.
Production Path
Man-made variants involve dissolving natural wood pulp in a solvent and extruding it through spinnerets to form filaments. While cotton is a natural cellulosic fiber that grows on the seed, rayon and lyocell are regenerated versions created through chemical processing. These materials require careful temperature control during dyeing.
Chemical Resistance
Resistance to alkalis allows these materials to undergo mercerization, which improves luster and dye affinity. Most cellulosic fiber types suffer damage when exposed to concentrated mineral acids. The molecular chains hydrolyze in acidic environments, leading to a loss of tensile strength.
Reducing agents are often used in vat dyeing without harming the fiber structure. Heat resistance remains relatively high, allowing for hot ironing without melting or scorching the surface of the finished garment.
Moisture Interaction
Natural absorption capacity allows the material to swell when wet, which changes the fabric dimensions. A cellulosic fiber will typically lose strength when wet if it is regenerated, whereas cotton becomes stronger. Swelling can lead to shrinkage during the first laundry cycle.
Laundering temperatures must be managed to prevent permanent creases in the fabric.