Bicomponent Fiber Processing and Mechanical Properties

Bicomponent fibres integrate two distinct polymeric materials within a single filament, enabling the combination of complementary properties such as strength, elasticity or functionality. These configurations—including sheath/core, side-by-side and island-in-sea—are realised principally by melt spinning with carefully controlled channel designs and flow ratios. Post-spinning drawing and thermal treatments tune molecular orientation and crystallinity, directly influencing tensile strength, modulus and elongation. Advances in spinneret technology and in-line characterisation now permit precise spatial placement of additives or secondary polymers to impart flame retardancy, thermal responsiveness or dyeability. Structure–property relationships have been elucidated through techniques such as differential scanning calorimetry, X-ray diffraction and scanning electron microscopy, revealing how microstructure governs mechanical performance. Bicomponent fibres find applications in high-performance textiles, adaptive thermal insulation and sustainable materials where biodegradability and recyclability are essential. The global drive towards multifunctional and eco-friendly fibres underscores the importance of ongoing research in processing innovation and mechanical characterisation.

Research from Nature Portfolio

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Research from all publishers

Researchers have developed sheath/core bicomponent fibres incorporating intumescent flame retardants into the core while retaining an amorphous sheath polymer. Pilot-scale melt spinning with varied draw ratios achieved fibres that balance spinnability with mechanical integrity, yielding a 46 % reduction in heat release rate for nonwoven fabrics without compromising tensile strength. Morphological and thermal analyses clarified the role of crystallinity in flame-retardant performance.

Thermoresponsive PBT-based bicomponent fibres have been fabricated in side-by-side configurations to produce self-crimping behaviour across −20 °C to 20 °C. By optimising draw ratio and fibre diameter, researchers maximised curvature change driven by mismatched moduli and coefficients of thermal expansion. The resulting nonwovens demonstrated reversible structural changes and competitive mechanical properties for adaptive insulation in both civilian and defence textiles.

Dyeing of PET/PTT side-by-side bicomponent filament yarns has been optimised to preserve mechanical performance during colouration. Systematic variation of temperature, pH, time and carrier concentration enabled uniform uptake of disperse dyes without altering elasticity or elastic recovery. Characterisation by SEM, FTIR and DSC confirmed that tailored process parameters maintain polymer morphology and tensile behaviour post-dyeing.

Bicomponent Fiber Processing and Mechanical Properties publication trend

The graph below shows the total number of articles in bicomponent fiber processing and mechanical properties across all publications each year (not limited to Nature Index journals).

Technical terms

Bicomponent fibre: A filament composed of two different polymers arranged in specific spatial configurations to combine properties.

Melt spinning: A fibre production technique in which polymer is melted, extruded through a spinneret and solidified by cooling and drawing.

Draw ratio: The ratio of filament length after drawing to its original length, controlling molecular orientation and mechanical properties.

Crystallinity: The degree of ordered molecular packing in a polymer, influencing stiffness, strength and thermal behaviour.

Coefficient of Thermal Expansion (CTE): A measure of dimensional change per degree temperature change, critical in self-crimping fibre design.

Tenacity: Tensile strength of a fibre expressed relative to its linear density, indicating mechanical performance.

References

1. Novel Bicomponent Functional Fibers with Sheath/Core Configuration Containing Intumescent Flame-Retardants for Textile Applications. Materials (2019).
2. Dyeing of Innovative Bicomponent Filament Fabrics (PET/PTT) by Disperse Dyestuffs: Characterization and Optimization Process. Processes (2020).
3. Temperature Responsive PBT Bicomponent Fibers for Dynamic Thermal Insulation. Polymers (2022).