1. General Information
     Plant fibres    Animal fibers    Chitin    Chitosan    Collagen    Keratin  

2. Properties
     Moisture Dependence  

3. Applications
     Industrial Use    Natural fiber composites    Nanocomposites    Biomaterial/Biocompatibility  

4. See also

5. References

6. External links

The earliest evidence of humans using fibers is the discovery of wool and dyed flax fibers found in a prehistoric cave in the Republic of Georgia that date back to 36,000 BP.^[5][6] Natural fibers can be used for high-tech applications, such as composite parts for automobiles. Compared to composites reinforced with glass fibers, composites with natural fibers have advantages such as lower density, better thermal insulation, and reduced skin irritation. Further, unlike glass fibers, natural fibers can be broken down by bacteria once they are no longer in use.

Natural fibers are good sweat absorbents and can be found in a variety of textures. Cotton fibers made from the cotton plant, for example, produce fabrics that are light in weight, soft in texture, and which can be made in various sizes and colors. Clothes made of natural fibers such as cotton are often preferred over clothing made of synthetic fibers by people living in hot and humid climates.

General Information

Natural fibers are made from plant, animal, and mineral sources. Natural fibers can be classified according to their origin.

Plant fibres

Animal fibers

Animal fibers generally comprise proteins such as collagen, keratin and fibroin; examples include silk, sinew, wool, catgut, angora, mohair and alpaca.

• Animal hair (wool or hairs): Fiber or wool taken from animals or hairy mammals. e.g. sheep's wool, goat hair (cashmere, mohair), alpaca hair, horse hair, etc.
• Silk fiber: Fiber secreted by glands (often located near the mouth) of insects during the preparation of cocoons.
• Avian fiber: Fibers from birds, e.g. feathers and feather fiber.

Chitin

Chitin is the second most abundant natural polymer in the world, with collagen being the first. It is a “linear polysaccharide of β-(1-4)-2-acetamido-2-deoxy-D-glucose”.^[10] Chitin is highly crystalline and is usually composed of chains organized in a β sheet. Due to its high crystallinity and chemical structure, it is insoluble in many solvents. It also has a low toxicity in the body and is inert in the intestines. Chitin also has antibacterial properties.^[9]

Chitin forms crystals that make fibrils that become surrounded by proteins. These fibrils can bundle to make larger fibers that contribute to the hierarchical structure of many biological materials.^[10] These fibrils can form randomly oriented networks that provide the mechanical strength of the organic layer in different biological materials.^[11]

Chitin provides protection and structural support to many living organisms. It makes up the cell walls of fungi and yeast, the shells of mollusks, the exoskeletons of insects and arthropods. In shells and exoskeletons, the chitin fibers contribute to their hierarchical structure.^[12]

In nature, pure chitin (100% acetylation) does not exist. It instead exists as a copolymer with chitin's deacetylated derivative, chitosan. When the acetylized composition of the copolymer is over 50% acetylated it is chitin.^[10] This copolymer of chitin and chitosan is a random or block copolymer.^[12]

Chitosan

Chitosan is a deacetylated derivative of chitin. When the acetylized composition of the copolymer is below 50% it is chitosan.^[10] Chitosan is a semicrystalline “polymer of β-(1-4)-2-amino-2-deoxy-D-glucose”.^[12] One difference between chitin and chitosan is that chitosan is soluble in acidic aqueous solutions. Chitosan is easier to process that chitin, but it is less stable because it is more hydrophilic and has pH sensitivity. Due to its ease of processing, chitosan is used in biomedical applications.^[9]

Collagen

Keratin

Keratin is a structural protein located at the hard surfaces in many vertebrates. Keratin has two forms, α-keratin and β-keratin and are used by different classes of animals. The naming convention for proteins follows that for keratin, alpha keratin is helical and beta keratin is sheet like. Alpha keratin is found in mammalian hair, skin, nails, horn and quills, while beta keratin can be found in avian and reptilian species in scales, feathers, and beaks. The two different structures of keratin have dissimilar mechanical properties, as seen in their dissimilar applications. The relative alignment of the keratin fibrils has a significant impact on the mechanical properties. In human hair the filaments of alpha keratin are highly aligned, giving a tensile strength of approximately 200MPa. This tensile strength is an order of magnitude higher than human nails (20MPa), because human hair’s keratin filaments are more aligned.^[12]

Properties

Compared to synthetic fibers, natural fibers tend have decreased stiffness and strength.^[12]

Properties also decrease with the age of the fiber. Younger fibers tend to be stronger and more elastic than older ones.^[12] Many natural fibers exhibit strain rate sensitivity due to their viscoelastic nature.^[14] Bone contains collagen and exhibits strain rate sensitivity in that the stiffness increases with strain rate, also known as strain hardening. Spider silk has hard and elastic regions that together contribute to its strain rate sensitivity, these cause the silk to exhibit strain hardening as well.^[10] Properties of natural fibers are also dependent on the moisture content in the fiber.^[12]

Moisture Dependence

The presence of water plays a crucial role in the mechanical behavior of natural fibers. Hydrated, biopolymers generally have enhanced ductility and toughness. Water plays the role of a plasticizer, a small molecule easing passage of polymer chains and in doing so increasing ductility and toughness. When using natural fibers in applications outside of their native use, the original level of hydration must be taken into account. For example when hydrated, the Young’s Modulus of collagen decreases from 3.26 to 0.6 GPa and becomes both more ductile and tougher. Additionally the density of collagen decreases from 1.34 to 1.18 g/cm^3.^[12]

Applications

Industrial Use

Of industrial value are four animal fibers, wool, silk, camel hair, and angora as well as four plant fibers, cotton, flax, hemp, and jute. Dominant in terms of scale of production and use is cotton for textiles.^[15]

Natural fiber composites

Natural fibers are also used in composite materials, much like synthetic or glass fibers. These composites, called biocomposites, are a natural fiber in a matrix of synthetic polymers.^[1] One of the first biofiber-reinforced plastics in use was a cellulose fiber in phenolics in 1908.^[1] Usage includes applications where energy absorption is important, such as insulation, noise absorbing panels, or collapsable areas in automobiles.^[16]

Natural fibers can have different advantages over synthetic reinforcing fibers. Most notably they are biodegradable and renewable. Additionally, they often have low densities and lower processing costs than synthetic materials.^[16][17] Design issues with natural fiber-reinforced composites include poor strength (natural fibers are not as strong as glass fibers) and difficulty with actually bonding the fibers and the matrix. Hydrophobic polymer matrices offer insufficient adhesion for hydrophilic fibers.^[16]

Nanocomposites

In regards to natural fibers, some of the best example of nanocomposites appear in biology. Bone, abalone shell, nacre, and tooth enamel are all nanocomposites. As of 2010, most synthetic polymer nanocomposites exhibit inferior toughness and mechanical properties compared to biological nanocomposites.^[18] Completely synthetic nanocomposites do exist, however nanosized biopolymers are also being tested in synthetic matrices. Several types of protein based, nanosized fibers are being used in nanocomposites. These include collagen, cellulose, chitin and tunican.^[38] These structural proteins must be processed before use in composites.

To use cellulose as an example, semicrystalline microfibrils are sheared in the amorphous region, resulting in microcrystalline cellulose (MCC). These small, crystalline cellulose fibrils are at this points reclassified as a whisker and can be 2 to 20 nm in diameter with shapes ranging from spherical to cylindrical. Whiskers of collagen, chitin, and cellulose have all be used to make biological nanocomposites. The matrix of these composites are commonly hydrophobic synthetic polymers such as polyethylene, and polyvinyl chloride and copolymers of polystyrene and polyacrylate.^[38][18]

Traditionally in composite science a strong interface between the matrix and filler is required to achieve favorable mechanical properties. If this is not the case, the phases tend to separate along the weak interface and makes for very poor mechanical properties. In a MCC composite however this is not the case, if the interaction between the filler and matrix is stronger than the filler-filler interaction the mechanical strength of the composite is noticeably decreased.^[19]

Difficulties in natural fiber nanocomposites arise from dispersity and the tendency small fibers to aggregate in the matrix. Because of the high surface area to volume ratio the fibers have a tendency to aggregate, more so than in micro-scale composites. Additionally secondary processing of collagen sources to obtain sufficient purity collagen micro fibrils adds a degree of cost and challenge to creating a load bearing cellulose or other filler based nanocomposite.^[19]

Biomaterial/Biocompatibility

See also

• Coir
• Fiber
• International Year of Natural Fibres 2009
• Spider silk

References

External links

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