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Chapter 30: Problem 3

Which of the following is a chain growth polymer? (a) proteins (b) starch (c) nucleic acid (d) polystyrene

Short Answer

Expert verified
Polystyrene is the chain growth polymer.

Step by step solution

01

Understanding Chain-Growth Polymerization

Chain-growth polymerization involves the process of adding monomers with reactive double bonds or other reactive sites one at a time to the growing end of a polymer chain. This is different from step-growth polymerization, where the reaction occurs between all monomers with functional groups. Common examples of chain-growth polymerization include polymerization of alkenes like ethylene to form polyethylene.
02

Analyzing the Options

Examine each option based on the types of monomers and polymerization it involves: - (a) Proteins are formed by amino acids linking through peptide bonds, a step-growth polymerization process. - (b) Starch is a polysaccharide formed by glucose units linked together, another step-growth polymerization example. - (c) Nucleic acids, like DNA and RNA, are formed by nucleotide monomers linking into long chains, also through step-growth polymerization. - (d) Polystyrene is formed by the polymerization of styrene monomers, which involves a chain-growth polymerization process.
03

Determining the Chain-Growth Polymer

Based on the chain-growth polymerization process, the polymers formed from alkenes involve this type of growth mechanism. In the given options, polystyrene is produced from styrene monomers using chain-growth polymerization.
04

Conclusion

Among the given options, polystyrene is the only polymer formed by chain-growth polymerization, with reactive sites in the styrene monomers facilitating a chain addition process.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

polystyrene
Polystyrene is a common plastic used in many everyday items, such as food containers and packaging materials. It is made through a process called chain-growth polymerization, specifically from a monomer known as styrene. The styrene monomers have reactive double bonds, which allow them to connect in a chain-like fashion.
Most notably, polystyrene is a thermoplastic. This means it can be remolded and reshaped when heated, making it very versatile for various applications.
  • Characteristics: lightweight, good insulation properties
  • Uses: disposable cutlery, building insulation, and more
With its clear and rigid nature, polystyrene is ideal for crafting products that need both flexibility and durability.
step-growth polymerization
Step-growth polymerization is another way polymers are formed. It involves different mechanisms compared to chain-growth polymerization.
In this process, any two molecules containing functional groups can react to form a bond, leading to the creation of a larger molecule. This means that monomers do not need to have reactive double bonds, like those seen in chain-growth polymerization. More often, they have functional groups like -OH or -NH groups. Because of this difference, step-growth polymerization can form both linear and network polymers.
  • Examples: Proteins and starch are produced by this method.
  • Rate of Reaction: Typically slower than chain-growth polymerization as it requires multiple steps of reactions.
Overall, step-growth polymerization is used for forming complex structures with diverse applications.
polymerization processes
Polymerization processes are chemical reactions where monomers link together to form a polymer. These processes are vital in creating various materials with unique properties, used in countless applications globally.
There are two primary types of polymerization processes: chain-growth and step-growth. Each of these processes has its own characteristics and applications:
  • Chain-growth polymerization: Monomers add to the chain one at a time. Commonly involves reactive double bonds.
  • Step-growth polymerization: Any two reactive monomers can combine. Requires functional groups such as -COOH or -NH2.
Understanding these processes helps explain why certain materials, like polystyrene, behave the way they do. This knowledge is foundational in fields like material science and chemical engineering.

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Most popular questions from this chapter

Ebonite is (a) natural rubber (b) synthetic rubber (c) highly vulcanized rubber (d) polypropene

The best way to prepare polyisobutylene is (a) coordination polymerization (b) free radical polymerization (c) cationic polymerization (d) anionic polymerization

Which of the following is a copolymer? (a) Nylon 6,6 (b) polyethene (c) PMMA (d) Nylon-6

Synthetic human hair wigs are made from a copolymer of vinyl chloride and acrylonitrile and is called (a) Dynel (b) Cellulose (c) PVC (d) Polyacrylonitrile

Buna \(-\mathrm{N}\) synthetic rubber is copolymer of: (a) \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}_{2}\) and \(\mathrm{H}_{5} \mathrm{C}_{6}-\mathrm{CH}=\mathrm{CH}_{2}\) (b) \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{CN}\) and \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}_{2}\) (c) \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{CN}\) and C=CC(=C)C C=CC(=C)Cl (d) \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{C}=\mathrm{CH}_{2}\) and \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}_{2}\)
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