Question

In: Mechanical Engineering

Determine which of the following polymers are the result of polymerization, and which are the result...

Determine which of the following polymers are the result of polymerization, and which are the result of post-polymerization processing. Explain!

1. low density polyethylene

2. high density polyethylene

3. phenol-formaldehyde

4. heavily cross-linked polyisoprene (glass trans. temp: 50C)

5. lightly cross-linked polyisoprene (glass trans. temp: -60C)

Solutions

Expert Solution

1) Low density polythylene         - polymerization

It is made by a method called free radical polymerization under high pressure. It was the first and typcal grade of polythene ever made.

2. High density polythylene         - post - polymerization

It is made by catalytic polymerization if petroleum using catalysts

3. Phenol Formaldehyde              - Polymerization

They are formed by a step-growth polymerization reaction that can be either acid- or base-catalysed.

4. heavily cross-linked polyisoprene        - post - polymerization

Sulphur treatment to improve cross-linking

5. lightly cross-linked polyisoprene          - polymerization

They have light cross links that they posses while being formed naturally.

samet mamat answered 2 years ago
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