Questions: 1. Write a complete reaction for the chain initiation step for the polymerization of Methyl Methacrylate using Benzoyl Peroxide as an initiator. 2. Use the above reaction product to write one cycle of the chain propagation step for the polymerization of Methyl Methacrylate.

1. Write a complete reaction for the chain initiation step for the polymerization of Methyl Methacrylate using Benzoyl Peroxide as an initiator.
2. Use the above reaction product to write one cycle of the chain propagation step for the polymerization of Methyl Methacrylate.

Transcript text: 1. Write a complete reaction for the chain initiation step for the polymerization of Methyl Methacrylate using Benzoyl Peroxide as an initiator. 2. Use the above reaction product to write one cycle of the chain propagation step for the polymerization of Methyl Methacrylate.

Solution

Solution Steps

Step 1: Chain Initiation Reaction

Write a complete reaction for the chain initiation step for the polymerization of Methyl Methacrylate using Benzoyl Peroxide as an initiator.

Benzoyl Peroxide decomposes to form two benzoyloxy radicals: \[ (C_6H_5CO)_2O_2 \rightarrow 2C_6H_5COO\cdot \]

Each benzoyloxy radical then loses a carbon dioxide molecule to form a phenyl radical: \[ C_6H_5COO\cdot \rightarrow C_6H_5\cdot + CO_2 \]

Step 2: Chain Propagation Reaction

Use the above reaction product to write one cycle of the chain propagation step for the polymerization of Methyl Methacrylate.

The phenyl radical reacts with a molecule of Methyl Methacrylate (MMA) to form a new radical: \[ C_6H_5\cdot + CH_2=C(CH_3)COOCH_3 \rightarrow C_6H_5CH_2C\cdot(CH_3)COOCH_3 \]

Step 3: Further Propagation

The new radical formed in the previous step reacts with another molecule of Methyl Methacrylate to continue the chain propagation: \[ C_6H_5CH_2C\cdot(CH_3)COOCH_3 + CH_2=C(CH_3)COOCH_3 \rightarrow C_6H_5CH_2C(CH_3)COOCH_3CH_2C\cdot(CH_3)COOCH_3 \]

Final Answer

Chain Initiation Reaction: \[ (C_6H_5CO)_2O_2 \rightarrow 2C_6H_5COO\cdot \] \[ C_6H_5COO\cdot \rightarrow C_6H_5\cdot + CO_2 \]
Chain Propagation Reaction: \[ C_6H_5\cdot + CH_2=C(CH_3)COOCH_3 \rightarrow C_6H_5CH_2C\cdot(CH_3)COOCH_3 \]
Further Propagation: \[ C_6H_5CH_2C\cdot(CH_3)COOCH_3 + CH_2=C(CH_3)COOCH_3 \rightarrow C_6H_5CH_2C(CH_3)COOCH_3CH_2C\cdot(CH_3)COOCH_3 \]

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