Polymerization
Hardchemistry
Polymerization of ethene proceeds via which mechanism (typical Ziegler–Natta)?
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Solution
Incorrect! Answer:
Coordination insertion on catalyst
- Catalyst: Ziegler–Natta catalysts (TiCl4/Al(C2H5)3) allow for low-pressure polymerization.
- Mechanism Step 1: The ethene monomer coordinates with the vacant site on the transition metal (Ti).
- Mechanism Step 2: The coordinated monomer then inserts into the existing metal-carbon bond of the growing polymer chain.
- Advantage: This coordination-insertion pathway allows for high degree of control over branching and stereoregularity (forming High-Density Polyethylene, HDPE).
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About This Question
- Subject
- chemistry
- Chapter
- hydrocarbons
- Topic
- polymerization
- Difficulty
- Hard
- Year
- 2025
Solution
Correct Answer:
Coordination insertion on catalyst
- Catalyst: Ziegler–Natta catalysts (TiCl4/Al(C2H5)3) allow for low-pressure polymerization.
- Mechanism Step 1: The ethene monomer coordinates with the vacant site on the transition metal (Ti).
- Mechanism Step 2: The coordinated monomer then inserts into the existing metal-carbon bond of the growing polymer chain.
- Advantage: This coordination-insertion pathway allows for high degree of control over branching and stereoregularity (forming High-Density Polyethylene, HDPE).
This hard difficulty chemistry question is from the chapter hydrocarbons, covering the topic of polymerization. It appeared in the 2025 exam.
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