Polymers
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A natural linear polymer of 2-methyl-1, 3-butadiene becomes hard on treatment with sulphur between 373 to 415K and —S—S— bonds are formed between chains. Write the structure of the product of this treatment?
A natural linear polymer of 2-methyl-1, 3-butadiene becomes hard on treatment with sulphur between 373 to 415K and —S—S— bonds are formed between chains. Write the structure of the product of this treatment?
This is a Long Answer Type Questions as classified in NCERT Exemplar
Ans: While manufacturing tyre rubber, 5 % sulfur is used as a crosslinking agent. A natural linear polymer of 2-methyl-1, 3-butadiene becomes hard on treatment with sulfur and forms vulcanised rubber. The structure of the pro
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Which of the following polymers soften on heating and harden on cooling? What are the polymers with this property collectively called? What are the structural similarities between such polymers? Bakelite, urea-formaldehyde resin, polythene, polyvinyl, polystyrene.
Which of the following polymers soften on heating and harden on cooling? What are the polymers with this property collectively called? What are the structural similarities between such polymers? Bakelite, urea-formaldehyde resin, polythene, polyvinyl, polystyrene.
This is a Long Answer Type Questions as classified in NCERT Exemplar
Thermoplastic polymer
Thermoplastic polymers are linear or slight branched-chain polymers. In this type of polymer, the strong intermolecular force of attraction is present between elastomers and fibers. This type of polymer softens
Upvote Low density polythene and high density polythene, both are polymers of ethene but there is marked difference in their properties. Explain.
Low density polythene and high density polythene, both are polymers of ethene but there is marked difference in their properties. Explain.
This is a Long Answer Type Questions as classified in NCERT Exemplar
Ans:
Upvote Phenol and formaldehyde undergo condensation to give a polymer (A) which on heating with formaldehyde gives a thermosetting polymer (B). Name the polymers. Write the reactions involved in the formation of (A). What is the structural difference between two polymers?
Phenol and formaldehyde undergo condensation to give a polymer (A) which on heating with formaldehyde gives a thermosetting polymer (B). Name the polymers. Write the reactions involved in the formation of (A). What is the structural difference between two polymers?
This is a Long Answer Type Questions as classified in NCERT Exemplar
The oldest synthetic polymers are phenol-formaldehyde polymers. These are made by combining phenol and formaldehyde in the presence of either an acid or a base catalyst. The reaction begins with the formation of o-and/or p hydroxyme
Upvote Differentiate between rubbers and plastics on the basis of intermolecular forces
Differentiate between rubbers and plastics on the basis of intermolecular forces
This is a Long Answer Type Questions as classified in NCERT Exemplar
In rubber, the polymer chain are held together by the weakest force of attraction. While, in plastic, the strong intermolecular force of attraction is present between elastomers and fibres.
In rubber, a few crosslinks are introduced
Upvote <p><strong>Differentiate between rubbers and plastics on the basis of intermolecular forces</strong></p>
<p><strong>Differentiate between rubbers and plastics on the basis of intermolecular forces</strong></p>
Synthetic polymers do not degrade in the environment for a long time. How can biodegradable synthetic polymers be made. Differentiate between biopolymers and biodegradable polymers and give examples of each type.
Synthetic polymers do not degrade in the environment for a long time. How can biodegradable synthetic polymers be made. Differentiate between biopolymers and biodegradable polymers and give examples of each type.
This is a Long Answer Type Questions as classified in NCERT Exemplar
1.Poly-hydroxybutyrate-co-β-hydroxyvalerate (PHBV)
It's made by copolymerization 3-hydroxybutanoic acid and 3-hydroxypentanoic acid. PHBV is used in specialty packaging, orthopaedic devices, and controlled drug release. In the enviro
Upvote 15.24 What is a biodegradable polymer? Give an example of a biodegradable aliphatic polyester.
15.24 What is a biodegradable polymer? Give an example of a biodegradable aliphatic polyester.
15.24
Biodegradable polymers are designed to degrade into simpler components like water, CO2, Nitrogen etc. upon disposal by the action of living organisms. Extraordinary progress has been made in the development of practical processes and products from polymers such as starch, cellulose, and lactic
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