ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
New functional homopolymeric, semiconducting materials soluble in polar solvents,were synthesized by chemical oxidative polymerization of 4-amino-3-hydroxynaphthalene-1-sulfonic acid (AHNSA) and its salts, using ammonium peroxydisulfate as an oxidant, in water atroom temperature. Polymerization products obtained from AHNSA, AHNSA hydrochloride,AHNSA mono-sodium salt and AHNSA di-sodium salt were characterized by elemental analysis,gel-permeation chromatography (GPC), infrared spectroscopy (IR) and conductivity measurements.Polymers of AHNSA salts have increased weight-average molecular weights and polydispersityindex values, compared to AHNSA polymer. Molecular weights approach a maximum value of~25200 for polymers of AHNSA salts. Elemental analysis data of polymeric samples show adecrease of the S/C ratio for all polymeric materials in comparison with the monomer, indicatingconsiderable elimination of sulfonic acid group from the macromolecular structure during thepolymerization process. New substitution patterns shown by IR spectroscopic analysis combinedwith MNDO-PM3 semi-empirical quantum mechanical calculations revealed N─C couplingreactions as dominant, where C belongs to unsubstituted AHNSA ring. Coupling mode N─C1 isalso important. Naphthoquinonoid and benzenoid structures were observed by IR spectroscopy.Influence of pH on the AHNSA oxidative chemical polymerization mechanism was examined
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.518.405.pdf
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