Polyvinylpyrrolidone (PVP) is often used in hair sprays to hold hair in place. Draw a few units of the PVP polymer. The vinylpyrrolidone monomer unit has the following structure:

Question

Chemical structure of the vinylpyrrolidone monomer unit used in polyvinylpyrrolidone (PVP) polymer.

Accepted Answer

Welcome back. Agreement. Let's take a look at our next problem. Polyvinyl benzene, commonly known as polystyrene is a material frequently found in packaging and disposable food containers illustrates several units of the polystyrene polymer. The styrene monomer unit can be represented as and we see the structure of our styrene unit, we see two carbons with a double bond and attached to one carbon is a phenyl group or benzene ring. So this one's a little tricky because it can be difficult to visualize how this will be polymerized with this big old benzene ring on it. So it can be helpful to kind of think about in general how these polymerization reactions work, which is we have are alkenes. So cc double bonds with whatever groups they have on them and the double bonds break and then form a new single bond between the neighboring molecules. And so you end up with new single bonds between the carbons. So let's see if we can draw our styrene molecules in such a way that we can kind of envision this chain coming together. So we have our carbon carbon double bond and then we know on one side, it's just two hydrogens. On the other side, we have a hydrogen and we have a Beyl group. And I'm just going to draw that as the hexagon with a circle inside it just as that shorthand for a benzene ring. And let's draw our second styrene molecule in this case, two hydrogens on the one side, hydrogen and our benzene ring on the other side. So let's look at our sort of generic reaction we described above and see how that works with the two styrene molecules. So we're going to form a new single bond between the adjacent carbons. So it'll now go to a tetrahedral geometry. It was trigonal planar before. So we know we have those carbons kind of in this alternating zigzag as we drew of our first carbon is from our first molecule. It still has the same hydrogens attached to it. That doesn't change just that the double bond has now become a single bond. So then we have a single bond to the second carbon. So it has a hydrogen coming up on top and then coming on the bottom is our fenny ring. So put that down there. And now there's a new single bond between that carbon with the benzene ring on it and the first carbon of the next unit. So it has two hydrogens. So we alternate a carbon with two hydrogens. So ach two and then a carbon with one hydrogen and a phenyl ring. So that's sort of our alternating structure in our polymer. So our question tells us to illustrate several units of this polymer. So we can just keep on going as long as we alternate ch two with a carbon that has a hydrogen and a benzene ring. So that just keeps on going as long as we need it to. And we'll put brackets around this and put a little N showing we have this to however many units we want our polymer to continue. So the key here is just understanding where those new bonds go in our polymer and that we end up with this carbon chain of single bonds that alternates the ch two and then the carbon with the menze ring. See you in the next video.

Polyvinylpyrrolidone (PVP) is often used in hair sprays to hold hair in place. Draw a few units of the PVP polymer. The vinylpyrrolidone monomer unit has the following structure:

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Key Concepts

Polyvinylpyrrolidone (PVP)

Polymer Structure

Monomer Unit