Which one of the following is an example of a thermosetting polymer?

 

1. ${\left(-{\mathrm{CH}}_2-\underset{\mathrm{Cl}}{\underset{|}{\mathrm{C}}}=\mathrm{CH}-{\mathrm{CH}}_2-\right)}_n$

 

2. ${\left({\mathrm{CH}}_2-\underset{\mathrm{Cl}}{\underset{|}{\mathrm{CH}}}-\right)}_n$

 

3. ${\left(-\stackrel{\mathrm{H}}{\stackrel{|}{\mathrm{N}}}-{\left({\mathrm{CH}}_2\right)}_6-\stackrel{\mathrm{H}}{\stackrel{|}{\mathrm{N}}}-\stackrel{\mathrm{O}}{\stackrel{\left|\right|}{\mathrm{C}}}{\left({\mathrm{CH}}_2\right)}_4-\stackrel{\mathrm{O}}{\stackrel{\left|\right|}{\mathrm{C}-}}\right)}_n$

 

4. 

 

Caprolactum is used for the manufacture of

1. Nylon-6

2. Teflon

3. Terylene

4. Nylon-6,6

Regarding cross-linked or network polymers, which of the following statements is incorrect?

1. They contain covalent bonds between various linear polymer chains,

2. They are formed from bi and tri functional monomers.

3. Examples are bakelite and melamine

4. They contain strong covalent bonds in their polymer chains

Which one of the _following structures represents nylon 6, 6 polymer?

1.  

2.  

3. 

4.  

The catalyst used in the manufacture of polythene by Ziegler method is:
1. Titanium tetrachloride and triphenyl aluminium
2. Titanium tetrachloride and triethyl aluminium
3. Titanium dioxide
4. Titanium iso-propoxide

Which of the following is wrong?
1. PMMA is called plexiglass
2. PTFE is called teflon
3. SBR is called natural rubber
4. LDPE is called low density polyethylene

Which one is a homopolymer?
1. Bakelite
2. Nylon-6,6
3. Terylene
4. Neoprene

Which of the following is not a fibre?

1. Terylene

2. Nylons

3. Polyacrylonitrile

4. Polychloroprene