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

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Mechanical Engineering

Determine which of the following polymers are the result ofpolymerization, and which are the result ofpost-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)

Answer & Explanation Solved by verified expert
4.1 Ratings (697 Votes)

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.
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