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Chapter 14: Problem 15

Sketch the repeat structure for each of the fol( lowing alternating copolymers: (a) poly(ethylenepropylene), (b) poly(butadiene-styrene), and (c) poly(isobutylene-isoprene).

Short Answer

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Question: Sketch the repeat structures for the following alternating copolymers: (a) poly(ethylenepropylene), (b) poly(butadiene-styrene), and (c) poly(isobutylene-isoprene). Answer: (a) Poly(ethylenepropylene) repeat structure: (-CH2-C-CH2-CH-C-)- (b) Poly(butadiene-styrene) repeat structure: (-CH=CH2-CH2-CH=C-C-CH2-CH-)- (c) Poly(isobutylene-isoprene) repeat structure: (-CH2-CH-CH2-CH(-CH3)-C=C-C=CH-CH3)-

Step by step solution

01

(a) Poly(ethylenepropylene) repeat structure

First, let's draw the structures of ethylene (C2H4) and propylene (C3H6): Ethylene: H H | | C=C | | H H Propylene: CH3 | C=C | | H H Since we are dealing with an alternating copolymer, the repeat structure will have one ethylene monomer followed by a propylene monomer. When combined, the molecule will look like: H H CH3 | | | (-CH2-C-CH2-CH-C-)- The repeat structure for poly(ethylenepropylene) is as above.
02

(b) Poly(butadiene-styrene) repeat structure

Next, let's draw the structures of butadiene (C4H6) and styrene (C6H5-CH=CH2): Butadiene: H H | | -C=C-C=C- | | H H Styrene: H H C6H5 | | | (-CH=CH2-CH2-CH=C-C-CH2-CH-)- The repeat structure for poly(butadiene-styrene) is as above.
03

(c) Poly(isobutylene-isoprene) repeat structure

Lastly, let's draw the structures of isobutylene (C4H8) and isoprene (C5H8): Isobutylene: CH3 | -C-C- | | CH3 Isoprene: H H | | -C=C-C=CH-CH3 The repeat structure for poly(isobutylene-isoprene) is as follows: CH3 | H H (-CH2-CH-CH2-CH(-CH3)-C=C-C=CH-CH3)- The repeat structures for the alternating copolymers have been sketched. Remember that, in practice, these structures would continue repeating throughout the polymer chain.

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Most popular questions from this chapter

A random poly(styrene-butadiene) copoly\(\Theta\) mer has a number-average molecular weight of \(350,000 \mathrm{~g} /\) mol and a degree of polymerization of 5000. Compute the fraction of styrene and butadiene repeat units in this copolymer.

(a) Is it possible to grind up and reuse phenol- ( formaldehyde? Why or why not? (b) Is it possible to grind up and reuse polypropylene? Why or why not?

On the basis of the structures presented in this chapter, sketch repeat unit structures for the following polymers: (a) polychlorotrifluoroethylene (b) poly(vinyl alcohol)

Compare thermoplastic and thermosetting polymers (a) on the basis of mechanical characteristics upon heating and (b) according to possible molecular structures.

Molecular weight data for some polymer are tabulated here. Compute (a) the number average molecular weight, and (b) the weight-average molecular weight. (c) If it is known that this material's degree of polymerization is \(477,\) which one of the polymers listed in Table 14.3 is this polymer? Why? $$\begin{array}{ccc} \hline \text {Molecular Weight} & & \\ \text {Range }(\mathrm{g} / \mathrm{mol}) & \boldsymbol{x}_{\boldsymbol{i}} & \boldsymbol{w}_{\boldsymbol{i}} \\ \hline 8,000-20,000 & 0.05 & 0.02 \\ 20,000-32,000 & 0.15 & 0.08 \\ 32,000-44,000 & 0.21 & 0.17 \\ 44,000-56,000 & 0.28 & 0.29 \\ 56,000-68,000 & 0.18 & 0.23 \\ 68,000-80,000 & 0.10 & 0.16 \\ 80,000-92,000 & 0.03 & 0.05 \\ \hline \end{array}$$
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