(Solved) Explain, in as much detail as possible, why the nylon is only created at the INTERFACE between these

Londongirl

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11 years ago

Explain, in as much detail as possible, why the nylon is only created at the INTERFACE between these

This is the only question I am not sure how to answer. Any help would be appreciated! Slight Smile

d) (2 pts.) Explain, in as much detail as possible, why the nylon is only created at the INTERFACE between these two solutions.

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kapeshia

wrote...

11 years ago

In this case, The two solutions are not miscible so the reaction can only occur at the interface, and that is why nylon is only created at interface.

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padre

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acasto0871

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11 years ago

All polymerizations fall into two categories: step-growth polymerizations and chain-growth polymerizations. Both step-growth polymerizations and chain-growth polymerizations are used to make nylons. Making nylon from a diacid and a diamine is a step-growth polymerization. So is making nylon from an amino acid. Making nylon from lactams is usually a chain-growth polymerization.

So what is the difference between the two types of polymerization? That would take a long time to explain, so if you want to know, go read the Macrogalleria page called Putting Them Together. But there are some practical differences you should know about for this experiment...

In a step-growth system, we start off with monomers. The monomers combine and grow into dimers, trimers, tetramers, and so forth. The molecules get bigger and bigger, but only when we're done (when the polymerization reaches high conversion) do we have high molecular weight polymers.

But in a chain growth system, we start off with monomers, and the monomers quickly form high molecular weight polymers. There are high molecular weight polymers present in your test tube just after you start the polymerization. What's more, you won't have dimers, trimers, and other oligomers hanging around. A growing polymer chain grows so fast that it reaches high molecular weight quickly, and it doesn't spend any real length of time as an oligomer.

Polycondensations

Please don't get confused, but there is another way to describe polymerizations other than the step-growth/chain-growth system. There is also the condensation/addition system. To know more about this system, again go visit the Macrogalleria page Putting Them Together. The most important thing you need to know about this system is that it classifies all polymerizations as polycondensations or polyadditions. Polycondensations are polymerizations in which a small molecule by-product is produced. The by-product is usually something like water, HCl, or once in awhile NaCl. Polyadditions on the other hand are polymerizations in which no by-product is produced.

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padre

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sarah.brush

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11 years ago

Consider the reaction of sebacoyl chloride with 1,6-hexanediamine to form Nylon 6-10. Nylon 6-10 is a copolymer made by the chemical combination of these two different monomers. Each of these monomers is dissolved separately in two immiscible liquids, water and tetrachloroethylene (TCE).

When these two solutions are in contact with each other, the monomers can only react at the interface between them. The nylon rope is drawn from this polymer film that forms at the interface. As soon as old polymer film is removed, new film forms immediately behind it. Thus, the reaction results in the continuous creation of polymeric material until at least one of the reactant monomers is completely consumed.

The nylon rope that formed in the solution at the interface between the two solutions is called a polymer chain.

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ipodps3

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11 years ago

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Lab_07.doc (36.5 KB)

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padre, wrangler5511, Tiqurrion2000, gpass, nevermindthat, lwilkowski

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Explain, in as much detail as possible, why the nylon is only created at the INTERFACE between these

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