a) Syndiotactic polyacrylonitrile
Interpretation:
Draw the three-dimensional structure of the polymeric products given in the question.
Concept introduction:
Isotactic, syndiotactic, and atactic are the stereochemical forms. The
Syndiotactic are the macromolecules in which the (-R) groups are arranged in an alternate manner along the long chain of the polymer. Gutta percha is also an example for Syndiotactic polymer.
In atactic form, the substituents are placed in a random manner along the long chain.
The important point to note here is that the polymer obtained from the chain growth
b) Atactic poly(methyl methacrylate)
Interpretation:
Draw the three-dimensional structure of the polymeric products given in the question.
Concept introduction:
Isotactic, syndiotactic, and atactic are the stereochemical forms. The polymer having the (-R) group on the same side of the macromolecule backbone (zig-zag bone) is known as isotactic polymer. An isotactic macromolecule consists of 100% meso diads.
Syndiotactic are the macromolecules in which the (-R) groups are arranged in an alternate manner along the long chain of the polymer. Gutta percha is also an example for Syndiotactic polymer.
In atactic form, the substituents are placed in a random manner along the long chain.
The important point to note here is that the polymer obtained from the chain growth polymerization mechanism must have chiral carbons to possess these structures. If the polymer formed does not have chiral carbon then it cannot occur in isotactic, syndiotactic and atactic forms.
c) Isotactic poly(vinyl chloride)
Interpretation:
Draw the three-dimensional structure of the polymeric products given in the question.
Concept introduction:
Isotactic, syndiotactic, and atactic are the stereochemical forms. The polymer having the (-R) group on the same side of the macromolecule backbone (zig-zag bone) is known as isotactic polymer. An isotactic macromolecule consists of 100% meso diads.
Syndiotactic are the macromolecules in which the (-R) groups are arranged in an alternate manner along the long chain of the polymer. Gutta percha is also an example for Syndiotactic polymer.
In atactic form, the substituents are placed in a random manner along the long chain.
The important point to note here is that the polymer obtained from the chain growth polymerization mechanism must have chiral carbons to possess these structures. If the polymer formed does not have chiral carbon then it cannot occur in isotactic, syndiotactic and atactic forms.
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Chapter 31 Solutions
Organic Chemistry
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- 1. Explain the following observations: (i) Kevlar has an extremely high tensile strength and melting temperature. (ii) At room temperature, poly(methylmethacrylate) is transparent, while polyethylene istranslucent. At temperatures above 135°C, both polymers are transparent. (iii) Polyoxymethylene and polyethylene exhibit similar mechanical behaviour. However, the glass transition temperature of polyoxymethylene is about 50°C higher than that of polyethylene.arrow_forwardAn alternating copolymer is known to have a number-average molecular weight of 100,000 g/mol and a degree of polymerization of 2210. If one of the repeat units is ethylene, which of styrene, propylene, tetrafluoroethylene, and vinyl chloride is the other repeat unit? Why?arrow_forwardSEE THE ATTACHED IAMGEarrow_forward
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