Dear Shoaib Aasim, aniline polymerizes via oxidative polymerization, using strong oxidants such as APS and the acids you mentionned. Please check the following document. My Regards
https://www.nature.com/articles/pj201143#:~:text=The%20conventional%20chemical%20oxidative%20polymerization,as%20ammonium%20peroxydisulfate%2C%20APS).
Hi ;
Chemical polymerization in an organic or aqueous acid medium is an oxidation polymerization (oxidation of the monomer to a radical cation). It requires the presence of the monomer, the aniline, and an oxidant in an acid. The acids most used are hydrochloric acid (HCl) and sulfuric acid (H2SO4). An acidic medium allows to promote the solubilization of the monomer, the aniline, in water and to limit the secondary reactions. The nature of the acid has an influence on the polymerization time, morphology, physicochemical properties and molar mass.
Please check the attached documents.
With my best regards
Dear Mr. Shoaib Aasim,
Polyaniline is a polare polymere. Ok this effect have a little shielding EMC effect.
Better is to use a filler particle with the polyaniline as the matrix polymere. You can use for a high shielding effect a metallic filler particles.
So you get a good shielding effect over the reflection damping. If you like to have a absorption or multi re reflection effect , so you must another filler particle.
It is a great way. The second pint is the frequency range , ....
Sincerely Yours
F. Gräbner
Dear Shoaib, thank you for asking this very interesting technical question on RG. First of all, the reason for addition of acid in the preparation of polyaniline is very simple. Aniline itself is more or less insoluble in water. It can be solubilized by adding acids to give the corresponding water-soluble anilinium salts (e.g. aniline hydrochloride). This facilitates the subsequent oxidation e.g. with ammonium persulfate. For a good description of the synthetic procedure please have a look at the following protocol:
Preparation of Polyaniline (Emeraldine Base)
(see attached pdf file)
For the second part of your question, please see e.g. the following interesting article:
Synthesis and Characterization of Conducting Polyaniline/Graphene Nanocomposites for Electromagnetic Interference Shielding
Article Synthesis and Characterization of Conducting Polyaniline/Gra...
This paper is freely available as public full text on RG.
I also suggest that you search the "Publications" section of RG for the term "polyaniline". This will provide you with a long list of relevant papers which have been posted by RG members, many of them even as public full texts:
https://www.researchgate.net/search.Search.html?type=publication&query=polyaniline
For example, please check out this instructive review article:
Preparations, Properties, and Applications of Polyaniline and Polyaniline Thin Films—A Review
Article Preparations, Properties, and Applications of Polyaniline an...
I hope this helps. Good luck with your research and best wishes, Frank Edelmann
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