I need support in preparing poly(3-aminobenzoic acid). I have come to the traditional method of using hydrochloric acid with ammonium persulfate at low temperature. unfortunately, the yield is very low in addition to difficulties in the washing process (huge excess of water still not enough). this situation led to the belief that there is a severe solubility in the water although, according to literature, it is not water soluble except in the alkaline water.
- Is there a better way for the preparation?
- How to control the polymer molecular weight?
- The most appropriate methods for the process of precipitate washing?
I presume you want to prepare a polyamide from the aminobenzoic acid by polycondensation. In this case free radical initiators (as persulfate) do not help. Free radical initiators are used for unsaturated monomers which polymerize by chain polymerization. Or, alternatively, if you want to prepare conducting polymers analogous to polyaniline, you have to use oxidizing agents (including persulfate but then you use a different mechanism).
Article Conducting polymers from aminobenzoic acids and aminobenzene...
https://www.nature.com/articles/pj2009306
ttps://www.ias.ac.in/article/fulltext/boms/036/04/0641-0645
http://www1.ci.uc.pt/pessoal/brett/docs/55_SynMet.pdf
Возможно, если вы возьмете эфир этой кислоты, например этиловый, и в присутствие металлического натрия или лития. литий диизопропил амид
https://tel.archives-ouvertes.fr/tel-01281327/file/TUNC_DENIZ_2014.pdf
The abstract of an article, relevant to your research , has been given here at Research Gate long time ago:
Article Poly(2‐) and (3‐aminobenzoic acids) and their copolymers wit...
The article was published in 2003 by 2 authors (who have not joined RG yet). Try to get the full paper from someone who has access to the Journal of Applied Polymer Science or at least the addresses of the authors in order to contact them.
thanks all Sandeep Chandrashekharappa , Gyorgy Banhegyi , Adel Amer , Александр Данисович Латыпов , and Nizar Matar for your kind support. I tried to prepare in acid medium and ammonium persulphate i get no precipitate. Some paper refer to the possibility of deposition by ammonia solution, put i can't confirm that. i tried another method described in an old paper using sodium hydroxide instead of an acid. i got 66.6% yield but the polymer is to some extent soluble so i face some issues in the washing process.
Dear all, since the problem of solubility persist again, this means that your synthesis conditions are still giving oligomers as major percentage. I think you have to look for conditions used to synthesize polyamides for Kevlar fibers since it requires higher molecular weights. I attached the paper recommended by Dr. Nizar. Best Regards
Please see the above document:
Process for preparing poly-para-aminobenzoic acid. Patent: US3225011A United States
chemical polymerization of the respective monomers with aqueous 1M hydrochloric acid and 0.49M sodium hydroxide, using ammonium persulfate as an oxidizing agent. In addition, polymerization in an acid medium was carried out in the presence of metal ions
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