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Explain vulcanization of rubber. - Chemistry

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प्रश्न

Explain vulcanization of rubber.

थोडक्यात उत्तर
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उत्तर

Vulcanization of rubber:

  1. The process by which a network of cross-links is introduced into an elastomer is called vulcanization.
  2. Vulcanization of rubber is carried out to improve the physical properties of natural rubber.
  3. The profound effect of vulcanization enhances the properties like tensile strength, stiffness, elasticity, toughness, etc. of natural rubber.
  4. Most frequently the used process of vulcanization is sulfur vulcanization. Sulfur forms crosslinks between polyisoprene chains which results in improved properties of natural rubber.
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पाठ 15: Introduction to Polymer Chemistry - Short Answer Questions (Type-II)

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एससीईआरटी महाराष्ट्र Chemistry [English] 12 Standard HSC
पाठ 15 Introduction to Polymer Chemistry
Short Answer Questions (Type-II) | Q 6.2

व्हिडिओ ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्‍न

Bakelite is the polymer of:

(a) Benzaldchyde and phenol

(b) Acetaldehyde and phenol

(c) Formaldehyde and phenol

(d) Formaldehyde and benzyl alcohol

 


Write the formulae of the raw materials used for preparation of Dextran.


Draw the structures of veronal and thymine. 


Write the monomers of the following polymer : 


Answer the following in one sentence.

Identify 'A' in the following reaction:


Answer the following in one sentence.

Define the term: Vulcanization


Answer the following in one sentence.

Identify thermoplastic and thermosetting plastic from the following:

  1. PET
  2. Urea formaldehyde resin
  3. Polythene
  4. Phenol formaldehyde resin

Answer the following.

Write the reaction of the formation of Terylene.


Answer the following.

Write structure of natural rubber and neoprene rubber along with the name and structure of their monomers.


Answer the following.

Draw the structures of polymers formed from the following monomers

H2N–(CH2)5 – COOH


Name and draw structure of the repeating unit in natural rubber.


Identify condensation polymers and addition polymers from the following.

\[\begin{array}{cc}\ce{-(CH2 - CH -)_{n}}\\
\phantom{....}|\\\ce{\phantom{.......}C6H5}
\end{array}\]


Identify condensation polymers and addition polymers from the following.

-(CO(CH2)4 - CONH(CH2)6NH-)n


Answer the following.

Is synthetic rubber better than natural rubber? If so, in what respect?


Nylon 6, 6 is a condensation polymer of hexamethylenediamine and _____________


Write the name of the catalyst used for preparation of high density polythene polymer.


Monomers ethylene glycol and terephthalic acid undergo condensation polymerization to give polymer called ___________


Write the name of one example of each polymer in which following repeating units.

\[\begin{array}{cc}
\ce{(-CF2-CF2-), -[NH-(CH2)5-CO] -, -(CH2-CH-), (-CH2-CH2-)}\\
\phantom{............................}|\\
\phantom{..............................}\ce{CN}
\end{array}\]


Write the name and formulae of the monomers used for the preparation of dacron.


Write chemical reactions for the preparation of high-density polythene.


Write two uses and two properties of polythene.


Define rubber.


The following structure represents the polymer:

\[\begin{array}{cc}
\ce{[-C-CH2-NH-C-(-CH2)5 NH -]_{{n}}}\\
\phantom{}||\phantom{.............}||\phantom{................}\\
\phantom{}\ce{O}\phantom{.............}\ce{O}\phantom{................}
\end{array}\]


Which among the following polymers is used for making handles of cooker?


Identify additional polymers from the following.

I. \[\begin{array}{cc}
\ce{-(CH2 - CH -)_{{n}}}\\
\phantom{....}|\\
\phantom{.......}\ce{C6H5}
\end{array}\]

II. \[\ce{-(CH2 - CH = CH - CH2 -)_{{n}}}\]

III. \[\ce{-(CO(CH2)4 - CONH(CH2)6NH -)_{{n}}}\]

IV.


Identify the CORRECT statement regarding the following polymer.

\[\begin{array}{cc}
\phantom{....}\ce{O}\phantom{............}\ce{O}\phantom{...................}\ce{H}\phantom{.....}\\
\phantom{....}||\phantom{.............}||\phantom{...................}|\phantom{......}\\
\ce{-[C - (CH2)4 - C - NH - (CH2)6 - N -]_{{n}}}
\end{array}\]


The INCORRECT match for the polymer with its application is:


Identify the polymer obtained by polymerization of n moles of acrylonitrile.


Which among the following polymers can NOT be remoulded?


Which of the following catalysts is used in preparation of terylene?


Identify the monomers used in the preparation of Novolac.


Which of the following pair of compounds is used as monomers for bakelite?


Which of the following products is formed when benzaldehyde is treated with CH3MgBr and the addition product so obtained is subjected to acid hydrolysis?


Which of the following polymer has ester linkage?


Trans - form of poly isoprene is:-


Which of the following is an example of polyester?


Which of the following polymers is synthesized using a free radical polymerisation technique?


Nylon threads are made of ______.


Which of the following polymers do not involve cross linkages?


Which of the following polymer is used for manufacturing of buckets, dustbins, pipes, etc?


Identify the monomer used to prepare neoprene.


Name and draw structure of the repeating unit in natural rubber.


Write the name of the monomer of natural rubber.


Name and draw the structure of the repeating unit in natural rubber.


Name and draw structure of the repeating unit in natural rubber.


Write the structure of isoprene and the polymer obtained from it.


 Write the structure of isoprene and the polymer obtained from it.


Name and draw structure of the repeating unit in natural rubber.


Name and draw the structure of the repeating unit in natural rubber.


Write the structure of isoprene and the polymer obtained from it.


Write the structure of isoprene and the polymer obtained from it.


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