Tag: polymer

Questions Related to polymer

Which of the following polymers can be made by free radical addition polymerisation mechanism?

chemistry polymer addition polymerisation types of polymerisation reactions petrochemicals and polymers

  1. PE

  2. HDPE

  3. LDPE

  4. Telfon

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Correct Option: A,B,C,D
Explanation:

The polymers polyethene (PE), low density polyethene(LDPE), high density polyethene(HDPE) and teflon (polytetrafluoroethylene) can be made by free radical addition polymerisation (also known as chain growth polymerisation) mechanism.  To obtain free radicals, initiators such as benzoyl peroxide, tert-butyl peroxide or acetyl peroxide are used.

Polymerisation of buta - $1,:3$ - diene by free radical mechanism gives___________.

chemistry polymer addition polymerisation types of polymerisation reactions petrochemicals and polymers

  1. trans - $1,: 4$ - Polybutadiene

  2. cis - $1, :4$ - Polybutadiene

  3. Polyvinyl polyethene

  4. Polyallyl polythene

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Correct Option: A,B,C

$\begin{bmatrix}-CH _2-\underset{\underset{\textstyle\;OH}{\displaystyle\mid}}{\;\;\;CH}-CH _2-\underset{\underset{\textstyle\;OH}{\displaystyle\mid}}{\;\;\;CH}-CH _2-\underset{\underset{\textstyle\;OH}{\displaystyle\mid}}{\;\;\;CH}-\end{bmatrix} _n$

Polyvinyl alcohol (as shown above) is a unique polymer having high affinity for water. Which of the following procedures would be most suitable for its preparation?

chemistry polymer addition polymerisation types of polymerisation reactions petrochemicals and polymers

  1. radical chain polymerisation of $CH _2=CH-CH _2-OH$

  2. radical chain polymerisation of $CH _2=CH-OH$

  3. radical chain polymerisation of $CH _2=CH-CO _2CH _3$, following by base catalysed hydrolysis

  4. radical chain polymerisation of $CH _2=CH-OCOCH _3$, followed by acid catalysed hydrolysis

  5. radical chain polymerisation of $CH _2=CH-OCOCH _3$, followed by base catalysed hydrolysis

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Correct Option: B
Explanation:

$\begin{bmatrix}-CH _2-\underset{\underset{\textstyle\;OH}{\displaystyle\mid}}{\;\;\;CH}-CH _2-\underset{\underset{\textstyle\;OH}{\displaystyle\mid}}{\;\;\;CH}-CH _2-\underset{\underset{\textstyle\;OH}{\displaystyle\mid}}{\;\;\;CH}-\end{bmatrix} _n$ 


Polyvinyl alcohol is prepared by radical chain polymerisation of  $CH _2=CH-OCOCH _3$, followed by base catalysed hydrolysis in which acetate group is replaced by hydroxide group. 

Which of the following is not polyamide?

chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

  1. Nylon-6

  2. Nylon-66

  3. Protein

  4. Glyptal

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Correct Option: D
Explanation:

Glyptal is not a polyamide. It is an alkyd resin obtained from polyhydric alcohols and polybasic organic acids or their anhydrides; used for surface coatings .

Polystyrene is an example of ___.

chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

  1. elastomer

  2. fibre

  3. cation polymerisation polymer

  4. thermosetting polymer

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Correct Option: C
Explanation:

ELASTOMER  -  $Elastomers$ are rubber-like solids with elastic properties.
FIBRE  -  Fibre polymers are the thread forming solids with high tensile strength and high modulus.
THERMOSETTING  POLYMER  - These polymers are cross-linked or heavily branched molecules, which on heating undergo extensive cross-linking in moulds and again become infusible.
POLYSTYRENE - $Polystyrene$ is a thermoplastic polymer. It is formed by cation polymerisation. Hence, it is an example of a $cation$ $polymerisation$ $polymer$.

The polymer used for post operative stitches is:

chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

  1. glycolic acid

  2. poly lactic acid

  3. Nylon -$2$ - Nylon - $6$

  4. PHBV

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Correct Option: B
Explanation:

Polylactic acid is a thermoplastic aliphatic polyester derived from renewable resources
Polylactic acid is used for post operative stitches as it breaks down inside the body within $6$ months to $2$ years.

Nylon-6, 10 is a polymer of :

chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

  1. hexamethylene and adipic acid

  2. hexamethylene and sebacic acid

  3. caprolactam

  4. None of the above

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Correct Option: A

Which polymer describes tail - to - tail addition? 

chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

  1. $-CH _2-\underset{X}{\underset{|}{CH}}-CH _2-\underset{CH}{\underset{|}{X}}-$

  2. $-\underset{X}{\underset{|}{CH}}-CH _2-CH _2-\underset{X}{\underset{|}{CH}}-$

  3. $-CH _2-\underset{X}{\underset{|}{CH}}-\underset{X}{\underset{|}{CH}}-CH _2-$

  4. All of the above

Show answer
Correct Option: B
Explanation:
In tail to tail polymerization, $-X$ is located such that it is separated by $H$ atoms.

i.e, $-\underset { | }{ CH } -{ CH } _{ 2 }-{ CH } _{ 2 }-\underset { | }{ CH } -$
          $X$                                    $X$

$2$-chloro-$1$,$3$-butadiene is also known as : -

chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

  1. Chloroprene

  2. Neoprene

  3. Isoprene

  4. Buna-N

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Correct Option: A

Which statement about poly(chloroethene) is correct?

chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

  1. The polymer can be cracked to produce chlorinated alkenes

  2. The polymer has harmless combustion products

  3. The polymer is readily biodegradable when buried

  4. The repeat unit of the polymer has an $M _r$ of $97$.

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Correct Option: A
Explanation:

Polychloroethene is an addition polymer. Chloroethene can polymerise to form poly(chloroethene). Hence they can be cracked to produce chlorinated alkenes.