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Chapter 21: 79E (page 888)

Polystyrene can be made more rigid by copolymerization styrene with divinylbenzene

What purpose doesthedivinylbenzene serve? Why is the copolymer more rigid?

Short Answer

Expert verified

Divinylbenzene can crosslink between two polymer chains. This is the reason why the structure is more rigid

Step by step solution

01

To find the purpose does the divinylbenzene serve

The difference is in one additional double bond that divinylbenzene has. A double bond is important because it is a place where the additional monomer is connected to the polymer chain.In this case, divinylbenzene can crosslink with a different chain. This is the main reason why divinylbenzene gives a more rigid structure than using styrene.

Hence Divinylbenzene can make crosslink between two polymer chains. This is the reason why the structure is more rigid.

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Most popular questions from this chapter

If one hydrogen in a hydrocarbon is replaced by a halogen atom, the number of isomers that exist for the substituted compound depends on the number of types of hydrogen in the original hydrocarbon. Thus there is only one form of chloroethane (all hydrogens in ethane are equivalent), but there are two isomers of propane that arise from the substitution of a methyl hydrogen or a methylene hydrogen. How many isomers can be obtained when one hydrogen in each of the compounds named below is replaced by a chlorine atom?

(a) n-pentane

(b) 2-methylbutane

(c) 2,4-dimethylpentane

(d) methylcyclobutane

What tests could you perform to distinguish between the following pairs of compounds?

a.CH3CH2CH2CH3,CH2= CHCH2CH3b.CH3CH2CH2COOH,,CH3CH2CCH3c.CH3CH2CH2OH4,CH3CH3d.CH3CH2NH2,CH3OCH3

Which of the amino acids contain the following functional groups in their R group?

a. alcohol c. amine

b. carboxylic acid d. amide

Draw the isomer(s) specified. There may be more than one possible isomer for each part.

a. a cyclic compound that is an isomer of trans-‑2 butene

b. an ester that is an isomer of propanoic acid

c. a ketone that is an isomer of butanal

d. a secondary amine that is an isomer of butylamine

e. a tertiary amine that is an isomer of butylamine

f. an ether that is an isomer of 2-methyl-2-propanol

g. a secondary alcohol that is an isomer of 2-methyl-2-propanol

In 1994 chemists at Texas A\&M University reported the synthesis of a non-naturally occurring amino acid:

a. To which naturally occurring amino acid is this compound most similar?

b. A tetrapeptide, phe-met-arg-phe-is synthesized in the brains of rats addicted to morphine and heroin. (Theindicates that the peptide ends ininstead of.) The TAMU

scientists synthesized a similar tetrapeptide, with the synthetic amino acid above replacing one of the original amino acids. Draw a structure for the tetrapeptide containing the synthetic amino acid.

c. Indicate the chiral carbon atoms in the synthetic amino acid.

d. Draw the geometric isomers for this synthetic amino acid. (Hint: Refer to Exercise 25.)
See all solutions

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