Number average molecular mass (Mn) and mass average
mol. mass (M¯w)of synthetic polymers are related as:

(1) Mn < M¯w

(2) Mn > M¯w

(3) Mn = M¯w

(4) Mn > Mw

Subtopic:  Classification - Methods of Polymerization & Copolymerization |
 51%
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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

Subtopic:  Classification - Methods of Polymerization & Copolymerization |
 68%
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Nylons, polyesters, and cotton, all possess strength due to:

1. intermolecular H-bonding

2. van der Waals’ attraction

3. dipole-dipole interaction

4. None of the above

Subtopic:  Classification - Methods of Polymerization & Copolymerization |
 74%
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PDI for natural polymers is generally close to:

(1) zero                             

(2) 100

(3) 1                                   

(4) 10

Subtopic:  Classification - Methods of Polymerization & Copolymerization |
 53%
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The catalyst used in the manufacture of polythene by the Ziegler method is:

1. titanium tetrachloride and triphenyl aluminum

2. titanium tetrachloride and triethyl aluminium

3. titanium dioxide

4. titanium isopropoxide

Subtopic:  Classification - Methods of Polymerization & Copolymerization |
 85%
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 Which of the following is a step-growth polymer?

1. Bakelite

2. Polyethylene

3. Teflon

4. PVC

Subtopic:  Classification - Methods of Polymerization & Copolymerization |
 74%
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The initial reaction in the formation of bakelite is an example of:

(1) Aromatic electrophilic substitution.

(2) Aromatic nucleophilic substitution.

(3) Free radical reaction.

(4) Aldol reaction.

Subtopic:  Classification - Methods of Polymerization & Copolymerization |
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PMMA is the polymer of.

1. methylmethacrylate

2. methylacrylate

3. methacrylate

4. ethylacrylate

Subtopic:  Classification - Methods of Polymerization & Copolymerization |
 82%
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Condensation of caprolactam gives:

1. nylon-6,6               
2. nylon-6
3. nitrile rubber
4. nylon-6,10
 

Subtopic:  Polymers: Natural & Synthetic, Biodegradable & Non Biodegradable |
 88%
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Natural rubber has

1. All trans-configuration.

2. Alternate cis - and trans-configuration.

3. Random cis - and trans-configuration.

4. All cis-configuration.

Subtopic:  Classification - Methods of Polymerization & Copolymerization |
 78%
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