Question

Assume you need to make a new linear, high molecular weight, polyamide or polyester Q. 1 (a) Give the structures of the polymers that could be formed from the following monomers and in each case identify the repeating unit -NH2 H2N- OH -ОН но. Но 2 NH2 CI H2N 3. НО. ОН Но ОН 4. OH но 5. Describe the issues you must be aware of in order to consistently achieve high (b) molecular weight polyamide or polyester?

Answer 1

1) In the first and third reaction acid chloride and amine, functional groups will react to form polyamide.   

In the second and fourth reaction, acid and alcohol functional groups will react to form polyester.

In the fifth reaction, acid chloride and alcohol functional groups will react to form polyester.

NH2 LNH2 NH 2) Repaatirg unit OH HO HO t OH -oH HO- papaatirg

2) In the third and fourth reaction there may be a chance of intramolecular coupling can take place. This phenomenon reduces the long chain polymerisation. so the molecular weight of the polymer will low. Other reactions have less chance for intra-molecular coupling.
7 3) H,M HY

나/ HO o H HD