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Answers
1.ans : Polyester: It is the most common synthetic fiber. It is made of
polymer called as esters. The monomers used are tereptharic acid, di –
methyl ether and di-hydric alcohol.
Terylene a type of fiber is prepared from it to make dress materials.
Polyester can be melted into different shapes and sizes used to make
plastics.
2.ans : 1. PET – Polyethylene terepthalate.
2. HDPE – High Density Polyethylene.
3. V or PVC – Poly Vinyl Chloride.
4. LDPE – Low Density Polyethylene.
5. PP – Polypropylene.
6. PS – Polystyrene
3.ans : Plastics is the term commonly used to describe a wide range of synthetic or semi-synthetic materials that are used in a huge and growing range of applications.
4.ans : Thermoplastics: The plastics melt or deform on heating and soften on
cooling. They are linear chained polymers.
5.ans : Thermosetting plastics: The plastics once molded cannot be
deformed on heating. They are cross linked polymer.
6.ans : Polymers: Thermosets
Alkyds AMC. Properties: ...
Epoxies EP. Properties: ...
Furan. Properties: ...
Melamines/Ure (Aminos) MF, UF. Properties: ...
Phenolics PF. Properties: ...
Polyurethane cast elastomers (EP) Properties: ...
Unsaturated Polyester UP. Properties: ...
Vinyl Esters. Properties
7.ans : Advantages of plastics:
Light in weight
Strong
Durable
Molded into different shapes and sizes
Cheap of cost
Available easily
Recyclable
Non- reactive
Do not rust or corrode easily.
8.ans : Bio-degradable: A material which easily decomposes with natural
process.
Ex: peels of fruits and vegetables, waste food, leftover food, spoilt food,
clothes, paper, clay jars.
Non- biodegradable: A material that doesn’t decompose with natural
process.
Ex: plastic, glass.
Plastic takes 1000 years to decompose. It undergoes slow
decomposition. The process of burning plastics is slow and it releases
poisonous gases mixed up in air leading to diseases and air pollution.
These plastic choke the way of water and kill aquatic animals. It is one
of the reasons for global warming.
Every walk of our life is liked with plastic. We cannot avoid plastic but
can be reduced using of plastic by following 4R principle for creating
eco friendly environment.
Answer:
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Explanation:
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