Good day,
I am not a chemist, but a student studying mechanical engineering. I would like to know more about the morphology and the chain structure of PA6/66 Copolymer for the purpose of my thesis. After a long search on the internet, I couldn't find enough information about the morphology (macroscopic structure) and the chain structure of the PA6/66 Copolymer. I could only find out information about the general morphology of nylon fibers, which is a three-phase model with microfibrillar and inter-microfibrillar regions. I would be very grateful if anyone could provide me with the information or point me in the right direction.
Thank you in advance.
Hello,
I made a drawing of the chain structure of the two polyamides, which you mentioned. The PA6.6 is the condensation product of a diamine with 6 carbon atoms and a dicarboxylic acid with also 6 carbon atoms. The 6.6 gives the carbon atoms in the monomers, which form this kind of polymer. The PA6 has only one sort of monomer. The monomer is a ring shaped molecule, which carries a carboxylic and an anime group after opening.
In the pdf file you can see that 6 carbon atoms are between the two nitrogen atoms of the former amine groups and the other 6 carbon atoms are between the two former carboxylic groups. For PA6 the 6 carbon atoms are in between a former amine group and a former carboxylic group.
I also drew a sketch of a copolymer's chain structure. In the compolymers structure, some of the carbon atoms have a nitrogen as a neighbor and some are part of a former carboxylic acid.
Matthias Heck Thank you very much Matthias for your time and effort. Do you also happen to know what the macroscopic structure of PA6/66 copolymer looks like? I found out about the structure of PA6 homopolymer, which is semicrystalline with either alpha or gamma form of the crystalline phase. And that these crystalline phases present themselves in the form of sheets with hydrogen bondings between them. There are also intra- and interchain bondings due to the amine and carboxylic acid groups. It appears to me that the copolymer should possess a similar structure but up until now, I couldn't find enough information to confirm it. Any help is greatly appreciated.
I think this question is much harder to answer, than the one about the molecular structure.
In my drawing of the molecular structure I drew all three different monomer units, but they do not have to be in this ratio. Thus there is not only one PA6/66 copolmyer, but there are plenty with different ratios of P6 to PA6.6.
The interchain bondings should be present in the different copolymers as well, due to the same functional groups. PA6/PA6.6 should also be semicrystalline. I just found a patent in which the melting temperature in relation to the PA6 content is mentioned (The more PA6, the lower the melting point; Melting is related to the crystals and thus if there's a melting temperature, there have to be crystalline parts). However, I can not tell about the form of the crystalline phases.
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