Microfibrillar Composite Materials and Mechanical Properties
Summary
Microfibrillar composites (MFCs) constitute a class of polymeric materials in which a dispersed phase is drawn into high‐aspect‐ratio fibrils within a continuous matrix. This architecture combines the toughness and lightweight characteristics of thermoplastics with the stiffness and strength of fibre reinforcements. Typically produced by sequential extrusion, cold drawing and heat setting, MFCs exploit flow‐induced fibrillation and interfacial adhesion to develop a percolated network of microfibrils. Polypropylene/polyethylene terephthalate (PP/PET) blends remain the most widely studied system, but biodegradable combinations such as poly(butylene succinate)/poly(lactic acid) (PBS/PLA) have gained traction in sustainable materials research. The morphology of the fibrillar phase, its orientation and degree of crystallinity critically govern tensile strength, flexural modulus, impact resistance and viscoelastic behaviour. Compatibilisers or reactive additives are often employed to optimise interfacial bonding and tailor the processing–structure–property relationship. Applications span from lightweight automotive components and packaging to filaments for additive manufacturing and upcycled composites from post‐consumer waste. Advances continue to focus on refining control of fibril dimensions, enhancing mechanical performance under dynamic loads and broadening the use of renewable or recycled feedstocks.
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Microfibrillar Composite Materials and Mechanical Properties publication trend
The graph below shows the total number of articles in microfibrillar composite materials and mechanical properties across all publications each year (not limited to Nature Index journals).
Technical terms
Microfibrillar composite (MFC): A polymer composite in which a dispersed phase is transformed into high‐aspect‐ratio fibrils within a continuous matrix to enhance mechanical performance.
In situ microfibrillation: The process by which a dispersed polymer phase forms fibrils during melt processing through extensional or shear deformation without separate fibre addition.
Compatibiliser: An additive that improves interfacial adhesion between immiscible polymer phases, promoting dispersion and stress transfer.
Storage modulus (G′): A measure of the elastic (energy‐storage) response of a material under oscillatory deformation, indicative of stiffness in dynamic mechanical analysis.
Matrix: The continuous polymer phase that surrounds and supports the dispersed fibrillar or particulate phase in a composite.
References
- Morphology, Thermal, Mechanical Properties and Rheological Behavior of Biodegradable Poly(butylene succinate)/poly(lactic acid) In-Situ Submicrofibrillar Composites. Materials (2018).
- Mechanical Properties of Injection Molded PP/PET-Nanofibril Composites and Foams. Polymers (2022).
- Development of Polypropylene/Polyethylene Terephthalate Microfibrillar Composites Filament to Support Waste Management. Polymers (2021).
- The Feasibility of Using the MFC Concept to Upcycle Mixed Recycled Plastics. Sustainability (2021).
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