State one difference between the following and give one example of each.
a. Natural and synthetic fibres b. Biodegradable and non-biodegradable fibres
What are natural fibres? How are they classified?
What are the raw materials used to manufacture synthetic fibres?
What is the purpose of creating blended fibres?
What is the full form of PVC? State its one use.
Is plastic a biodegradable or non-biodegradable substance? Explain.
Fabric manufacturers are increasingly developing 'eco-friendly' or 'green' fabrics.
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Answers
1.
a. Natural fabrics, like merino wool, cotton, cashmere, and silk, are made of fibers that are produced by animals and plants. Synthetic fabrics, like polyester, nylon and acrylic, are "man-made" fibers that are created in laboratories.
b. Biodegradable substances are those that degrades or break down naturally. Non-biodegradable substances are those that do not degrade easily.
2.
Natural fibres can be classified according to their origin. The vegetable, or cellulose-base, class includes such important fibres as cotton, flax, and jute. The animal, or protein-base, fibres include wool, mohair, and silk. An important fibre in the mineral class is asbestos.
3.
Synthetic fibers are made from organic synthetic high-molecular compounds and are made synthetically from raw materials such as petroleum oil. Using this fiber alone or mixing it with natural pulp provides products with the useful characteristics of fiber.
4.
Blended fibres are made by combining various fibres to enhance the property of the product. For eg: spandex and cotton is a natural mix for sports clothing and undergarments to improve stretching properties and prevent odour. A blended fabric helps overcome the disadvantages of natural and synthetic fibre.
5.
a. Polyvinyl chloride (colloquial: polyvinyl, vinyl; abbreviated: PVC) is the world's third-most widely produced synthetic plastic polymer (after polyethylene and polypropylene). About 40 million tons of PVC are produced each year. PVC comes in two basic forms: rigid (sometimes abbreviated as RPVC) and flexible.
6. Is plastic a biodegradable or non-biodegradable substance? Explain.
ans. Most plastics are non-biodegradable mainly because plastic is widely used because of its low cost, versatility and durability. This durability is partially based on plastic being an uncommon target for bacteria, which makes it non-biodegradable.
7.Yes the fabric developers and manufactures are increasingly developing the production of eco friendly or green fabric, This is because, these fabrics do not have any synthetic or non-decomposable material, which can damage the environment after use. This promotes " Green chemistry".
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Explanation:
State one difference between the following and give one example of each.
a. Natural and synthetic fibres b. Biodegradable and non-biodegradable fibres
What are natural fibres? How are they classified?
What are the raw materials used to manufacture synthetic fibres?
What is the purpose of creating blended fibres?
What is the full form of PVC? State its one use.
Is plastic a biodegradable or non-biodegradable substance? Explain.
Fabric manufacturers are increasingly developing 'eco-friendly' or 'green' fabrics.
Comment.