2. How do thermoset plastics differ from thermoplast plastics?
3. Why are plastics called polymers?
4. Why do we find sparks between our body and the polyester shirt while taking ito
Answers
Answer:
1.The primary physical difference is that thermoplastics can be remelted back into a liquid, whereas thermoset plastics always remain in a permanent solid state.
2.Plastics are polymers. ... The word polymer comes from two Greek words: poly, meaning many, and meros, meaning parts or units. A polymer can be thought of as a chain in which each link is the “mer,” or monomer (single unit). The chain is made by joining, or polymerizing, at least 1,000 links together.
3.Due to the friction,static charge gets deposited on the shirt and the body. While taking off the shirt , we find sparks due to the electric discharge.
Explanation:
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2 thermosetting plastics are harder and stronger then thermoplastics.they can retain their shape and size even at high temperature.these polymers once set in a given shape on heating cannot be softened or melted on being reheated.these polymers undergo a permanent change upon melting and set to a solid which cannot be remelted.
eg melamine,bekalite,teflon
thermoplastics can be melted by heating and there after moulded into desired shapes and sizes.these plastics get softened on heating and become fluids,but on cooling they becomes harder.
eg PVC,polythene,polystyrene
3 since plasics are mades of small molecules called monomers and the repeated units are called polymer.so plastic is said to be a polymer.
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