1.what are the properties of polythene
2.What are thermoplastic and Their uses
Answers
Answer:
The properties and uses of polythene are as follows: Properties: 1) It is water resistant. 2) It is strong but flexible and can be rolled into sheets and moulded into different shapes.
Thermoplastics are defined as polymers that can be melted and recast almost indefinitely. They are molten when heated and harden upon cooling. When frozen, however, a thermoplastic becomes glass-like and subject to fracture.Thermoplastics are everywhere nowadays. These resins when cured remain flexible, and several types can be ‘welded’ or glued (polypropylene is difficult to glue well). These plastics can be cleaned, ground up and recycled.
They are found, in various types, in
toilet seats and cisterns
car parts
insulating foam
electronics
aircraft parts
Stockings
rope
carpet
packaging film
guttering
pipes
cookware and cutlery handles.
Thermoset resins are flowable in the setup stage, but when cured they turn rigid, and cannot be remelted. They are usually filled or reinforced somewhow, eg with wood flour (bakelite) or fibreglass.
They are found, in various types, in
fibreglass mouldings
aircraft parts
melamine resins used in counter tops and door coatings
HV electrical insulators
Aircraft and car parts
Explanation:
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