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Synthetic fibres and plastics is chapter 3 in NCERT Class 8 Science books. Synthetic fibres and plastics are beneficial things in our daily lives, they are made up of long chains of repeating units referred to as polymers. There are two types of fibres which are natural and synthetic. Cotton, wool, and silk are natural fibres and they are directly extracted from plants and animals, while nylon, rayon, etc., are synthetic fibres. In this article, let’s learn everything about Synthetic Fibres in detail.
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Synthetic fibres are man-made fibres with several repeating units manufactured in laboratories or factories by various chemical processes using petroleum products, also known as petrochemicals as raw materials. Different types of synthetic fibres are nylon, rayon, acrylic, and polyester. Nowadays, synthetic fibres are used in considerable amounts in manufacturing various materials such as ropes, fabrics, seat belts, and many more due to their low production cost, durability, and easy maintenance.
Synthetic fibres are made artificially by joining monomers, forming a polymer by this process known as polymerisation. They are made by chemical synthesis by using various reagents and chemicals. Synthetic fibres can be divided into two major categories:
Synthetic fibres are synthesised from a raw material called Petrochemicals. Some examples of synthetic fibres used in the textile are elastane, aramid, nylon, acrylic, polyester and Polyurethane leather. Different types of synthetic fibres are:
Rayon is a synthetic fibre made artificially by humans using natural sources as raw material, i.e., cellulose extracted from wood pulp and other agricultural products. Thus, rayon is a synthetic fibre, but it is derived from natural fibre.
Nylon is a synthetic fibre also known as polyamides. It is completely made up of polymerisation of chemical compounds adipic acid and hexamethylenediamine as monomers.
Polyester is a polymer derived from petroleum. It contains repeated units of ester groups to form polymers.
Advantages associated with using synthetic fibres are listed as follows:
Disadvantages related to using synthetic fibres are listed as follows:
The difference between natural and synthetic fibres are explained below:
|Natural fibres are found in nature. They are extracted directly from plants and animals.
|Synthetic fibres are man-made fibres having several repeating units and are manufactured in laboratories or factories by various chemical processes.
|They are porous in nature and are good absorbents.
|They are non-porous in nature and are bad absorbents.
|The structure of fibres cannot be changed.
|The structure of fibres can be changed or altered by using varieties of chemicals and reagents.
|They are biodegradable and eco-friendly.
|They are non-biodegradable and not eco-friendly.
|For example, cotton, wool, jute, etc.
|For example, nylon, polyester, rayon, etc.
Plastics are also polymers. Like synthetic fibres, they too have monomer units. Plastics may be linear as well as cross-linked polymers. We constantly use plastic materials in our daily life because they are easily moldable. We can make different plastic products due to this reason. They are also easy to carry and transport. Plastics are of two types:
Thermoplastics: The type of plastics that can be remoulded on heating as they melt and become soft and again become hard when cooled, are known as thermoplastics. Examples: Polythene, propylene, etc.
Thermosetting Plastics: Heavily branched plastics that cannot be remoulded as they become hard on heating are known as thermosetting plastics. Examples: Bakelite, urea-formaldehyde resins, etc.
Apart from various advantages, plastics are having various negative aspects such as:
Fibres are of two types based on their origin: Natural fibres and Synthetic fibres. Natural fibres are extracted from plants and animals, while synthetic fibres are manufactured from chemicals. In short, we can say that synthetic fibres are artificially made fibres in chemical laboratories that consist of many repeating units known as polymers.
Just like natural fibres, synthetic fibres can be woven into a fabric. Synthetic fibres have a wide range of uses varying from household articles like ropes, buckets, furniture, plastic containers, etc., to highly specialized uses such as ships, aircraft, spacecraft, health care, etc.
Various types of synthetic fibres are Rayon, Nylon, Polyester, and Acrylic. Synthetic fibres are much more durable, strong, and cheaper than natural fibres. Clothes made from synthetic fibres are effortless to maintain and wash.
In this manner, we can conclude that synthetic fibres have different and enhanced properties than natural fibres. However, they have certain disadvantages also like non-biodegradable and melting properties. But, when we look into their advantages and uses, they are of immense importance.
Frequently asked questions related to synthetic fibres are listed as follows:
Q. Which of the following is a synthetic fibre among jute, nylon, cotton, and wool?
Ans: Among all these fibres, nylon is synthetic fibre. It is completely made up of polymerisation of chemical compounds adipic acid and hexamethylenediamine as monomers.
Q. Why are some fibres called synthetic?
Ans: Some fibres are called synthetic fibres because these are manmade fibres synthesised by using chemicals. These are made up of small units (monomers) that join together to form long chains. Some of the examples of synthetic fibres include nylon, rayon, acrylic, polyester, etc.
Q. Is nylon a synthetic fibre?
Ans: Nylon is a synthetic fibre as it is completely made up of polymerisation of chemical compounds such as adipic acid and hexamethylenediamine as monomers.
Q. What is the difference between natural and synthetic fibres?
Ans: The basic difference between natural and synthetic fibres is that natural fibres are directly extracted from natural substances like plants and animals. For example, cotton and jute are extracted from plants, while silk is extracted from silkworms, and wool is extracted from the hairs of sheep. On the other hand, synthetic fibres are completely man-made and are synthesised from petrochemicals like nylon, rayon, polyester, etc.
Q. Is rayon a synthetic fibre?
Ans: Rayon is synthesised from regenerated cellulose fibres. Cellulose is purified once they are obtained from wood pulp which is converted into the soluble compound, and then they are processed in multiple steps to form a synthetic fibre. Though rayon is obtained from natural substances they are formed by manmade techniques thus, it is a synthetic fibre.
We hope this detailed article on synthetic fibres is helpful to you. If you have any queries on synthetic fibres, ping us through the comment box below and we will get back to you as soon as possible.
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