Describe the polymer architecture (linear, branched, hyperbranched or crosslinked) that is obtained by step growth polymerization of each of the monomer blends (i)-(vi) below. Assume a high extent of reaction in each case. (i) A2 + B2 (ii) AB2 + A2 (iii) A2 + B2 + AB (iv) AB2 + B3 (v) A2 + B3 (vi) A3 + AB

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### Polymer Architecture from Step Growth Polymerization

Understanding the architecture of polymers formed through step growth polymerization involves analyzing the combinations of different monomers used in the process. The process can result in varying polymer structures, which can be linear, branched, hyperbranched, or crosslinked. Below are descriptions of the polymer architectures expected from each monomer blend, assuming a high extent of reaction.

1. **Monomer Blend (i): \(A_2 + B_2\)**
   - **Expected Architecture**: Linear
   - Each \(A_2\) monomer has two functional sites that can react with two sites on a \(B_2\) monomer, resulting in a linear polymer chain.

2. **Monomer Blend (ii): \(AB_2 + A_2\)**
   - **Expected Architecture**: Branched
   - The \(AB_2\) monomer has one A and two B sites, which creates branching points when combined with \(A_2\) that has two A sites.

3. **Monomer Blend (iii): \(A_2 + B_2 + AB\)**
   - **Expected Architecture**: Linear
   - The addition of AB, a monomer capable of connecting two chains, still primarily results in linear chains due to the balance of functional groups.

4. **Monomer Blend (iv): \(AB_2 + B_3\)**
   - **Expected Architecture**: Hyperbranched or Crosslinked
   - The \(AB_2\) forms branches with additional B sites on \(B_3\), which can lead to a more complex, interconnected structure.

5. **Monomer Blend (v): \(A_2 + B_3\)**
   - **Expected Architecture**: Branched or Hyperbranched
   - The presence of \(B_3\), with three reaction sites, encourages the formation of branches and potentially hyperbranched structures.

6. **Monomer Blend (vi): \(A_3 + AB\)**
   - **Expected Architecture**: Hyperbranched or Crosslinked
   - With \(A_3\) contributing three functional sites, this blend is likely to form highly branched or crosslinked structures due to multiple connections forming per monomer.

These descriptions provide an understanding of how different combinations of monomers influence the architecture of the resulting polymer.
Transcribed Image Text:### Polymer Architecture from Step Growth Polymerization Understanding the architecture of polymers formed through step growth polymerization involves analyzing the combinations of different monomers used in the process. The process can result in varying polymer structures, which can be linear, branched, hyperbranched, or crosslinked. Below are descriptions of the polymer architectures expected from each monomer blend, assuming a high extent of reaction. 1. **Monomer Blend (i): \(A_2 + B_2\)** - **Expected Architecture**: Linear - Each \(A_2\) monomer has two functional sites that can react with two sites on a \(B_2\) monomer, resulting in a linear polymer chain. 2. **Monomer Blend (ii): \(AB_2 + A_2\)** - **Expected Architecture**: Branched - The \(AB_2\) monomer has one A and two B sites, which creates branching points when combined with \(A_2\) that has two A sites. 3. **Monomer Blend (iii): \(A_2 + B_2 + AB\)** - **Expected Architecture**: Linear - The addition of AB, a monomer capable of connecting two chains, still primarily results in linear chains due to the balance of functional groups. 4. **Monomer Blend (iv): \(AB_2 + B_3\)** - **Expected Architecture**: Hyperbranched or Crosslinked - The \(AB_2\) forms branches with additional B sites on \(B_3\), which can lead to a more complex, interconnected structure. 5. **Monomer Blend (v): \(A_2 + B_3\)** - **Expected Architecture**: Branched or Hyperbranched - The presence of \(B_3\), with three reaction sites, encourages the formation of branches and potentially hyperbranched structures. 6. **Monomer Blend (vi): \(A_3 + AB\)** - **Expected Architecture**: Hyperbranched or Crosslinked - With \(A_3\) contributing three functional sites, this blend is likely to form highly branched or crosslinked structures due to multiple connections forming per monomer. These descriptions provide an understanding of how different combinations of monomers influence the architecture of the resulting polymer.
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