Questions: Which of the following monomer pairs is the least appropriate one for a successful copolymerization? styrene and vinyl chloride styrene and acrylonitrile styrene and 1,3-butadiene styrene and methylmethacrylate

Which of the following monomer pairs is the least appropriate one for a successful copolymerization? styrene and vinyl chloride styrene and acrylonitrile styrene and 1,3-butadiene styrene and methylmethacrylate
Transcript text: Which of the following monomer pairs is the least appropriate one for a successful copolymerization? styrene and vinyl chloride styrene and acrylonitrile styrene and 1,3-butadiene styrene and methylmethacrylate
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Solution

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Solution Steps

Step 1: Understanding Copolymerization

Copolymerization involves the polymerization of two different monomers to form a copolymer. The success of copolymerization depends on the compatibility and reactivity ratios of the monomers involved. Monomers with similar reactivity ratios tend to copolymerize more successfully.

Step 2: Analyzing Monomer Pairs

Let's analyze the given monomer pairs:

  1. Styrene and Vinyl Chloride: These monomers have different reactivity ratios, which can lead to difficulties in copolymerization. Vinyl chloride is less reactive compared to styrene, which can result in a less uniform copolymer.

  2. Styrene and Acrylonitrile: This pair is known for successful copolymerization, forming SAN (styrene-acrylonitrile) copolymers, which are widely used in the industry.

  3. Styrene and 1,3-Butadiene: This pair is also known for successful copolymerization, forming SBR (styrene-butadiene rubber), which is commonly used in tires and other rubber products.

  4. Styrene and Methylmethacrylate: These monomers have different reactivity ratios, which can lead to challenges in achieving a uniform copolymer. Methylmethacrylate is more reactive than styrene, which can cause issues in the copolymerization process.

Step 3: Identifying the Least Appropriate Pair

Based on the analysis, the least appropriate pair for successful copolymerization is the one with the most significant difference in reactivity ratios, which can lead to a non-uniform copolymer.

Final Answer

The least appropriate monomer pair for successful copolymerization is:

\[ \boxed{\text{styrene and vinyl chloride}} \]

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