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ABS, a widely produced copolymer used for high-impact applications like car bumpers and crash helmets, is formed from three monomers-acrylonitrile \(\left(\mathrm{CH}_{2}=\mathrm{CHCN}\right), 1,3\) -butadiene \(\left(\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}_{2}\right)\), and styrene \(\left(\mathrm{CH}_{2}=\mathrm{CHPh}\right)\). Draw a possible structure for \(\mathrm{ABS}\)

Short Answer

Expert verified
ABS consists of alternating units of acrylonitrile, butadiene, and styrene linked together.

Step by step solution

01

Understand the Components

ABS is a copolymer consisting of acrylonitrile, butadiene, and styrene as its monomeric units. This means the polymer will contain repeating units from each of these monomers connected together.
02

Recognize the Structures of Monomers

Acrylonitrile is denoted by \(\mathrm{CH}_{2}=\mathrm{CHCN}\), 1,3-butadiene is \(\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}_{2}\), and styrene is \(\mathrm{CH}_{2}=\mathrm{CHPh}\). These monomers will form the backbone and side chains of the copolymer.
03

Polymerization Process

Imagine the double bonds in these molecules breaking and linking together, forming a long chain where each of the monomers contributes to the main polymer structure.
04

Draw the Polymer Structure

A possible structure of ABS would be a long chain where units derived from each monomer are interspersed or follow some regular pattern. One common arrangement would be a segment where acrylonitrile, butadiene, and styrene repeat in sequence along the chain. This could be drawn as:- Acrylonitrile linked to 1,3-butadiene in a manner like: \[-CH_2-CH(CN)-\]- Butadiene could contribute a structure like: \[-CH_2-CH=CH-CH_2-\]- Styrene might connect with: \[-CH_2-CH(Ph)-\].- Combining them, a small segment could be \[-CH_2-CH(CN)-CH_2-CH=CH-CH_2-CH_2-CH(Ph)-\].

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Key Concepts

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

Understanding Copolymerization
Copolyerization is a vital process in polymer chemistry that involves the combination of two or more different monomers to create a copolymer. This diversity in monomers means copolymers can be engineered with varied and enhanced properties compared to homopolymers, which consist of only one type of monomer.

During copolymerization:
  • Different monomers offer different functionalities and properties to the resulting polymer.
  • The arrangement of monomers can be tailored to achieve certain mechanical and chemical properties.
  • It allows the creation of materials that can withstand heightened stress or specific environmental conditions, making them suitable for various industrial applications.
In the case of ABS, the monomers acrylonitrile, butadiene, and styrene are copolymerized to create a material known for its strength and toughness, used in high-impact-resistant products.
Basics of Polymer Chemistry
Polymer chemistry is an exciting branch of chemistry focused on the chemical synthesis and properties of polymers, which are large molecules composed of repeated subunits. Understanding the basics of polymer chemistry can help you see how simple molecules are transformed into complex structures with diverse applications.

Key aspects include:
  • Monomers: Tiny molecules like acrylonitrile, butadiene, and styrene which serve as building blocks for polymers.
  • Polymerization: The chemical process where monomers connect, often involving the breaking and forming of chemical bonds.
  • Structure: Determines the physical properties. Linear polymers form strong materials, whereas branched ones might be less dense and weaker.
For ABS, understanding the cross-linking of its monomers through polymerization helps explain why it's strong enough for demanding applications like automotive parts.
Acrylonitrile Butadiene Styrene (ABS) Composition and Properties
ABS is a fascinating copolymer renowned for its robustness and surface finish, making it ideal for products demanding impact resistance. The interplay of its constituent monomers—acrylonitrile, butadiene, and styrene—creates a balanced material with enhanced features.

**Acrylonitrile** provides ABS with chemical resistance and strength. It features a polar nitrile group, which bonds tightly to other polymer units, improving durability.

**Butadiene:** This monomer adds toughness and impact resistance. Its flexible bonds absorb energy, which helps ABS withstand physical shocks.

**Styrene** contributes a lovely glossy surface appearance and hardness, thus enhancing the material's aesthetic and functional properties.

Overall, the balanced contribution of each monomer in ABS results in a versatile material. It combines surface aesthetics and mechanical resilience, explaining why it is favored in products like car bumpers and helmets.

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Most popular questions from this chapter

Thermosetting resins similar to Bakelite (Section 30.7) have also been prepared from renewable feedstocks. One method uses cardinol, the major constituent of the liquid obtained from roasted cashew nutshells. What polymer is obtained when cardinol is treated with formaldehyde \(\left(\mathrm{H}_{2} \mathrm{C}=\mathrm{O}\right)\) in the presence of a proton source?

What polymer is formed by the radical polymerization of each monomer? a. \(\mathrm{CH}_{2}=\mathrm{C}\left(\mathrm{CH}_{3}\right) \mathrm{CO}_{2} \mathrm{CH}_{3}\) b. \(\mathrm{CH}_{2}=\mathrm{C}\left(\mathrm{CH}_{3}\right) \mathrm{CN}\)

Although 1,3-propanediol (HOCH \(_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}\) ) can now be prepared from carbohydrate feedstocks (Section 30.8), it can also be prepared from petroleum feedstocks. Devise a synthesis of \(\mathrm{HOCH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}\) from \(\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CH}_{2}\), a product of petroleum refining.

Polyethylene terephthalate is also prepared by the transesterification of dimethyl terephthalate with ethylene glycol. Draw the mechanism for this nucleophilic acyl substitution.

(a) Explain why poly(vinyl alcohol) cannot be prepared by the radical polymerization of vinyl alcohol \(\left(\mathrm{CH}_{2}=\mathrm{CHOH}\right)\). (b) Devise a stepwise synthesis of poly(vinyl alcohol) from vinyl acetate \(\left(\mathrm{CH}_{2}=\mathrm{CHOCOCH}_{3}\right) .\) (c) How can poly(vinyl alcohol) be converted to poly(vinyl butyral), a polymer used in windshield safety glass?

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