Which of the following is NOT a stage of the Addition Polymerisation process?
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A.
Propagation
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B.
Termination
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C.
Crystallisation
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D.
Initiation
Correct Answer:
C. Crystallisation
Explanation:
The process of addition polymerization consists of three primary stages: initiation, propagation, and termination. During initiation, an active species such as a free radical is created to start the chain. Propagation involves the rapid and repetitive addition of monomer units to the growing chain. Finally, termination occurs when the growth of the chain stops, typically when two active chain ends combine. Crystallization is a physical property related to how polymer chains pack together into a structured arrangement after or during formation, but it is not a chemical stage of the polymerization reaction itself. Therefore, crystallization is the correct answer as it is not one of the three fundamental steps of the addition polymerization process.
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