Name a copolymer which is used for making non-breakable plastic crockery.

Melamine-formaldehyde resin is the copolymer, that is used for making non-breakable plastic crockery. Its monomers are melamine and formaldehyde.

Give the common name and IUPAC name of the monomer of natural rubber.

Natural polymer is a linear polymer of the monomer isoprene (common name). IUPAC name of isoprene: The longest chain contains four carbon atoms, hence the root word is 'but', the suffix diene is used for two double bonds, and it also contains a methyl substituent. Therefore, the IUPAC name is 2 -Methyl- 1 , 3 -butadiene.

Write the equation for the preparation of low density and high density polythene.

Preparation of low density polythene: It is manufactured by heating ethene at 200 ° C under a pressure of 1500 atm in the presence of traces of oxygen or a peroxide catalyst. The polymerisation takes place by free radical mechanism. nCH 2 = CH 2 ethene → O 2 200 ° C / 1500 atm - H 2 C - CH 2 - n polythene Preparation of high density polythene: It is manufactured by the polymerisation of ethene in a hydrocarbon solvent at 60 - 70 ° C under 6 - 7 atm pressure in the presence of Ziegler-Natta catalyst. nCH 2 = CH 2 ethene → 6 - 7 atm / Ziegler - Natta catalyst 60 ° - 70 ° C - H 2 C - CH 2 - n polythene

Write the names and give the structures of the monomers of Nylon- 6 , 6 .

Hexamethylenediamine and adipic acid are the monomers of Nylon- 6 , 6 . Both these monomers have six carbon atoms each which can be seen in the structures given below:

How is high density polythene obtained? What structural difference it has from low density polythene?

Addition polymerisation of ethene taking place in a hydrocarbon solvent, in the presence of a catalyst such as titanium tetrachloride (also known as Ziegler-Natta catalyst) at a temperature of 333 K to 343 K and under a pressure of 6 - 7 atmosphere, high density polythene (HDPE) is obtained. HDPE have stronger intermolecular forces than LDPE giving them strength and higher density.

Give the common and IUPAC name of the monomer of natural rubber.

Isoprene is the monomer of natural rubber. Its structure is given below: Its IUPAC name is 2 -methylbuta- 1 , 3 -diene.

Classify the following into addition and condensation polymers : Terylene, Bakelite, Polyvinyl chloride, Polythene

Addition polymers are obtained by the repeated addition of monomer molecules without any elimination. Polyvinyl chloride, polythene are addition polymers. Condensation polymers are obtained by the combination of monomers with the elimination of simple molecules like water, alcohol, ammonia, etc. Terylene and Bakelite are condensation polymers.

What is a biodegradable polymer?

The biodegradable polymers are the polymers, which are degraded by the microorganism within a suitable period so that biodegradable polymers and their degraded products do not cause any serious effects on the environment. These polymers contain functional groups similar to groups present in biopolymers. Example: PHB , PHBV .

E M B I B E

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter -1 - Polymers>Meghalaya Board-2020>Q 9

EASY

12th Meghalaya Board

IMPORTANT

Earn 100

What do you mean by homopolymer and copolymer? Give an example of each.

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Melamine-Formaldehyde Polymer

Melamine is highly stable and can resist high-temperature exposure as well as physical and chemical degradation. Let us learn more about Melamine in this video.

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