Question

define plastics and write the differences between types of plastics

Answer 1

Plastics :

A material which can be easily moulded into any desired shape on heating is called a plastic. plastics are synthetic ( man - made ) polymers.


Raw Materials For plastics :

petroleum product such as Ethane, propane, benzene, toluene etc are the raw materials for the plastics. These​ materials are either directly polymerised or first converted into suitable monomers chemically and then polymerised to form plastics.


Kinds of plastics :


plastics are of two types :

1. Thermosetting plastics.

2. Thermoplastics.


Thermosetting plastics :

A plastics Substance which once moulded cannot be remoulded by heating. Bakelite, melamine ,formaldehyde are thermosetting plastics. Cabinet of radio, Television ,Telephone sets water tank are examples of thermosetting plastics. Thermosetting plastics are suitable for making handles of kitchen utensils.


Thermoplastics :


A plastic which can be moulded and reused by giving desired new shapes. PVC, polysterene, nylon, polythene are some common thermoplastics. Thermoplastics are good for making pipes etc.


Differences Between Thermosetting plastics and Thermoplastics :


Thermosetting plastics :
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1. Thermosetting plastics are the polymers in which chains get highly cross-linked on heating.

2. Once moulded thermosetting plastics. cannot be remoulded.

3. Examples : Bakelite, melamine- formaldehyde resin.


Thermoplastics :
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1. Thermoplastics are long chain polymers with no cross-linking . Heating also does not produce any cross-linking between the chains.

2. Thermoplastics can be processed repeatedly.

3. Examples : polysterene, Nylon, polyesters, polythene , PVC , etc..

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