Chemistry || Terylene, Polyester and Ester Linkages .

追加: 2026-06-05

[00:00:00]This is another wonderful question falling under macromolecules.

[00:00:07]This is an interesting question that I want us to go through.

[00:00:13]The question is saying Terylene is a synthetic polyester. It is a a synthetic polyester.

[00:00:23]Which has an ester linkage similar to fats.

[00:00:29]When you just see this word synthetic, meaning we are talking about man-made.

[00:00:36]So, when we say synthetic polyester, we are talking about man-made esters, isn't it? Man-made polyesters.

[00:00:45]So, this is a structure of a terylene.

[00:00:48]Have you seen? This is oxygen. This is oxygen. This is a structure of a terylene.

[00:00:56]There is also nylon that you need to understand. Those are also gets to fall under synthetic.

[00:01:04]So, now you also need to understand that the question in an exam do come like this.

[00:01:13]You just get to find the structure like this. Then they'll tell you to say name the structure above.

[00:01:20]So, the way it is, carbon shaded box carbon or unshaded box O.

[00:01:29]Carbon which is C. So, if we are to make a song here we can say carbon shaded box carbon or C shaded box C. Or unshaded box O. C shaded box C. Or unshaded box O. Then where there is carbon, where there is carbon, you know that you need to have double bond O double bond O. So, that is a structure for what? Terylene.

[00:01:59]Now, we go to the first question. What is a polyester?

[00:02:06]A lot of definitions gets to pop up.

[00:02:09]So, when we are talking about a polyester, and a definition that you can consider, you can say a polyester is a synthetic man-made what? Man-made a a plastic kind of a plastic from where?

[00:02:31]Petroleum.

[00:02:33]They can mark you. You can also put this one where we can just say that a polyester, we are talking about what? We we can just say that this one is a polymer. Have you seen This one is a what? This one is a polymer. So, we can say that a polyester is a polymer. So, this one is a polymer containing So, a polymer containing many ester linkages. Many ester linkages.

[00:03:10]We can put up this particular definition. They are going to mark you.

[00:03:14]A lot of definitions gets to pop up.

[00:03:17]Then, they are telling us to say in this next question, "Name the elements that make up an ester link. Where is an ester link?" So, first of all, we go down down down. You find this question. "Draw a box around the repeating unit on this terylene what? Structure." So, a repeating unit that is now connected to an ester linkage. So, a repeating unit is this one. Have you seen? This is a repeating unit. This is what is repeating. Have you seen?

[00:03:52]We can say okay, that is what? A repeating unit. You can say that what is happening? This is an ester linkage. So, let me say this is an ester what? This is an ester linkage. This is an ester linkage. That is an ester linkage. So, name the elements that make up an ester linkage. This one which is an ester linkage, there is what? Carbon there. We can say there is what? There is carbon.

[00:04:25]And there is also what? Oxygen.

[00:04:31]We can put oxygen there. So, this is what you are supposed to get. This is what you need to understand. Now, when they say a repeating unit, so I want you to now get this one. This is an ester linkage. Now, a repeating unit, something that is repeating, you are going to observe that what is repeating is this part.

[00:04:55]From here, let me use a different ink.

[00:04:58]So, what is repeating is this one. Have you seen this part from here? This one.

[00:05:04]This part. This is what is repeating.

[00:05:07]That is an ester what?

[00:05:10]This That is a repeating unit. So, this is the one that is repeating. Have you seen this part? Another thing is to be formed here.

[00:05:19]So, you can say you can put this one dotted like this. This is the one that is repeating. But an ester linkage is this one that is here. This is an ester linkage. I guess we've established that understanding.

[00:05:37]Then we go to this particular question that is here. State one use of terylene.

[00:05:43]Terylene can be used in making what?

[00:05:46]Clothing. So, you can just say making what? You can put this one making what we get to call clothing.

[00:05:55]Making what? Making clothing. You can put that as the answer. So, this is it.

[00:06:02]This is something that I wanted to discuss with you and I guess you've learned one or two things. So, this is it. This is it. Thank you so much for your attention. This is where we end from. For those of you that are interested to start your tuitions with me, you can get this number. I'm going to help you get a distinction. We're doing all the Zambian subjects.

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