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A natural linear polymer of 2 methyl -1,...

A natural linear polymer of 2 methyl -1,3 - butadiene becomes hard on treatment with suphur between 373 to 415 K and -s - s- bonda are formed between chains.Write the structure of the product of this treatment?

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The natural linear polymer of 2-methyl -1,3- butadiene is cis -polyisoprene (natural rubber) . On heating with sulphur between `373-415 K`, vulcanization occurs as a result of which `-S-S-` bridges or cross- links are introduced between polymer chains through their reactive allylic positions as shown below :
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Rubber is a naturally occurring polymer, which is a linear polymer of isoprene. It can be easily deformed but regains its original shape after the stress is relieved. The properties of natural rubber can be modified and improved by process of vulcanization. It is mixed with 3 to 5% sulphur and heated at 373-423 K. This forms cross links through disulphide bonds (-S-S-) , which make rubber hard, tough with greater tensile strength. There are many different formulations of synthetic rubbers. These are copolymers in which one of the monomer is isoprene. Some common examples are neoprene rubber, Buna-S, Buna-N, etc. What is the structure and IUPAC name of monomers of natural rubber?

Rubber is a naturally occurring polymer, which is a linear polymer of isoprene. It can be easily deformed but regains its original shape after the stress is relieved. The properties of natural rubber can be modified and improved by process of vulcanization. It is mixed with 3 to 5% sulphur and heated at 373-423 K. This forms cross links through disulphide bonds (-S-S-) , which make rubber hard, tough with greater tensile strength. There are many different formulations of synthetic rubbers. These are copolymers in which one of the monomer is isoprene. Some common examples are neoprene rubber, Buna-S, Buna-N, etc. Name the monomers of synthetic rubber Buna-S.

Rubber is a naturally occurring polymer, which is a linear polymer of isoprene. It can be easily deformed but regains its original shape after the stress is relieved. The properties of natural rubber can be modified and improved by process of vulcanization. It is mixed with 3 to 5% sulphur and heated at 373-423 K. This forms cross links through disulphide bonds (-S-S-) , which make rubber hard, tough with greater tensile strength. There are many different formulations of synthetic rubbers. These are copolymers in which one of the monomer is isoprene. Some common examples are neoprene rubber, Buna-S, Buna-N, etc. Does natural rubber has cis- or trans-configuration about the double bonds?

Rubber is a naturally occurring polymer, which is a linear polymer of isoprene. It can be easily deformed but regains its original shape after the stress is relieved. The properties of natural rubber can be modified and improved by process of vulcanization. It is mixed with 3 to 5% sulphur and heated at 373-423 K. This forms cross links through disulphide bonds (-S-S-) , which make rubber hard, tough with greater tensile strength. There are many different formulations of synthetic rubbers. These are copolymers in which one of the monomer is isoprene. Some common examples are neoprene rubber, Buna-S, Buna-N, etc. What does the letter 'N' stands for in synthetic rubber Buna-N.

PRADEEP-POLYMERS-NCERT (Examplar Problems with answers , Hints and Solutions (Short Answer Questions))
  1. A natural linear polymer of 2 methyl -1,3 - butadiene becomes hard on ...

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  2. Identify the type of polymer. -A-A-A-A-A-A-

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  3. Identify the type of polymer -A-B-B-A-A-A-B-A-

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  4. Out ot chain growth polymerisation and step growth polymerisation, in ...

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  5. Identify the type of polymer given in the following figure.

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  6. Identify the polymer given below :

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  7. why are rubber called elastomers?

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  8. can enzyme be called a polymer?

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  9. Can nucleic acid protein and starch be considered as step growth polym...

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  10. How is the following resin intermediate prepared and which polymer is ...

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  11. To have practical applications why are cross links required in rubber?

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  12. Why does cis polyisoprene posses elastic porperty?

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  13. What is the structural difference between HDP and LDP? How does the st...

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  14. What is the role of benzoyl peroxide in addition polymerisation of alk...

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  15. Which factor imparts crystalline nature to a polymer like nylon?

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  16. Name the polymer used in laminating sheets and give the name of monome...

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  17. Which type of biomolecules have some structural similarity with synthe...

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  18. Why should the monomer used in addition polymerisation through free r...

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