Plastics are synthetic polymers of carbon and other elements with high molecular mass. Polymers are long chains of monomers and are malleable and can be converted into solid objects also. It is used in boxes, packaging, carry bags, switches, utensils, electrical wires, fire resistant fabric etc.
Although there are many different types of polymers, plastics in general are light and strong. Plastics may be moulded, extruded, cast, and blown into seemingly infinite shapes, films, and foams, as well as drawn into textile fibres. Plastics also make up a large part of coatings, sealants, and glues.
Usage of Plastics
Plastic has become an inseparable component of our daily life. The amount of plastic consumed each year has been gradually increasing. Low density, strength, user-friendly designs, fabrication capabilities, extended life, low weight, and low cost are all characteristics that have contributed to its rapid rise.
Plastic garbage is particularly visible because it accounts for a significant portion of total solid waste. Plastic wastes have been recognised as a severe solid waste concern precisely because of their high visibility.
Classification of Plastics
Broadly plastic can be divided into following two types –
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Thermoplastics
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Thermosetting plastics
Thermoplastics
Thermoplastic polymer is a type of plastic. Thermoplastics are those plastics which can be molded again and again by use of heat. Examples of thermoplastics are polyethene, polystyrene and PVC (polyvinyl chloride). Thermoplastic polymers are used in making carry bags, bottles etc.
Thermosetting plastics
Thermosetting plastics are those plastic polymers which cannot be molded again and again by use of heat. These are also known as thermoset polymers. Examples of thermosetting plastic are Bakelite, melamine etc. Thermosetting plastics are used in making handles of utensils, switches and fire-resistant fabric etc.
Advantages of Plastics
Plastics have numerous advantages and uses. Few of them are stated below –
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Its production cost is low.
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It can be easily molded into various shapes.
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It is lightweight.
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It is resistant to corrosion.
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It can be translucent, transparent, and opaque as well.
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It is a poor conductor of heat and electricity.
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It can be used to make roads, utensils, wires, pipes etc.
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It is used in construction of buildings as well.
Disadvantages of Plastics
Plastics manufacturing also involves the addition of potentially hazardous compounds like stabilisers or colourants. Many of these have not been subjected to environmental risk assessments, therefore their influence on human health and the environment is unknown at this time.
Phthalates, which are used in the production of PVC, are one such example. PVC has been used in toys for young children in the past, and there have been concerns that when these toys are chewed, phthalates may be produced. The impacts of phthalates on the environment are currently being assessed for risk. The disposal of plastics products also has a significant influence on the environment.
Most plastics are non-biodegradable, and once landfilled, they might take a long time to decompose. With an increasing number of plastic products, especially plastic packaging, being discarded quickly after purchase, the amount of landfill space required by plastic waste is becoming a major concern.
Cheap production and easy availability make plastic very useful, but it has many shortfalls and its harmful effects are a cause of huge concern for us to save our earth and ourselves. Its few disadvantages are listed below –
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Natural decomposition of plastic can last from 400-1000 years and few types of plastics are non-degradable as well.
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Plastic materials clog waterways, oceans, seas, lakes etc. 1 in 3 species of marine mammals have been found entangled in marine litter.
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Many animals eat plastic materials and die. Over 90% of all seabirds have plastic pieces in their stomachs.
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Plastic is widely used in packaging. Eating food out of plastic containers may cause cancer.
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Both creation and recycling of plastic produce toxic gases and residues which causes air and water and land pollution.
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Few additives such as phthalates etc. which are added in plastics to prevent its structure may cause serious hormonal imbalance in males and females.
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Plastic causes many fire hazards.
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Its cost of recycling is also very high.
Disadvantages of plastic bags are well known, this is the reason why use of plastic bags have been restricted in most of the countries in the world.
Summary
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