One type of Saran has the structure shown below. Write the...

One type of Saran has the structure shown below. Write the structures of the two monomers from which it is made.
$$
\sim \mathrm{CH}_{2} \mathrm{CCl}_{2}-\mathrm{CH}_{2} \mathrm{CHCl}-\mathrm{CH}_{2} \mathrm{CCl}_{2}-\mathrm{CH}_{2} \mathrm{CHCl} \sim
$$

Key Concepts

Addition Polymerization Mechanism

The addition polymerization mechanism is a reaction process in which monomers with double bonds, typically vinyl monomers, add together without the loss of any small molecule. This mechanism explains how the monomers, after initiating the free radical or ionic chain reaction, link together by opening up the double bonds to form a continuous polymer chain with repeating units derived directly from the original monomers.

Vinyl Monomers

Vinyl monomers are compounds that contain a carbon–carbon double bond (the vinyl group) and are capable of undergoing radical addition polymerization. Their structure, characterized by a reactive unsaturated bond and various substituents, allows for the formation of long-chain polymers such as those found in many commercial plastics, including the Saran-type polymer mentioned in the problem.

Monomer Structure Determination

Monomer structure determination involves working backward from the polymer’s repeating unit to identify the individual monomer units used in the polymerization. This process requires recognizing how the polymer segments can be divided into smaller fragments that correspond to the original double-bonded monomers before they underwent addition polymerization.

Copolymerization

Copolymerization is the process by which two (or more) different monomers are combined in a controlled manner to form a copolymer. In this context, understanding copolymerization is essential for deciphering how two distinct monomer units can alternate within a single polymer chain, as indicated by the repeating pattern in the given Saran structure.

Transcript

00:01 Okay, so i want to show the monomers in saran, and we're given a one, two, three, four, or a one, two, three, four, five, six, seven, eight carbon polymer, which is only part of the polymer, but we're showing eight carbons.

00:29 Okay, and we also have, we have two chlorines on the one carbon, and this is on every other carbon, so this is carbon one, carbon four is also going to have two chlorines, as well as carbon six.

00:48 And carbon 8.

00:52 And the others just have hydrogens.

00:57 And this is going to be the repeating unit.

00:59 So this is an example of an addition polymerization reaction that occurs between an alkyne and a radical.

01:05 So really, we're just going to redraw the repeating unit as an alkyne.

01:14 And it's going to look like this.

01:20 So the one carbon, carbon two has chlorines, and carbon one just has hydrogens.

01:29 And if we react this with a radical, let's say we have the oxygen radical.

01:33 It's going to attack the less hindr carbon of the akeen, which is this one.

01:38 These we just have hydrogen here instead of the functional group.

01:43 Remember, a fish hook is the movement of one electron, and a bond is two electrons, so we'll have an electron present on carbon two.

02:00 And carbon two can attack another one -one dichloroethylene.

02:23 I'm sorry, we actually have just one chlorine on this carbon...

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