NDLI: Molecular weight determinaiton of polyaniline

Content Provider	IEEE Xplore Digital Library
Author	Davied, S. Nicolau, Y.F. Melis, F. Revillon, A.
Copyright Year	1994
Description	Author affiliation: Laboratoire de Physique des Metaux Synthetiques/SESAM/DRFMC (Davied, S.)
Abstract	Summary form only given. The molecular weight (MW) of differently synthesised samples of polyaniline (PANI) is determined by: GPC, viscometry and light scattering (LS). The studied samples were prepared by: (1) chemical synthesis in HCI or other organic acids, in default of (NH/sub 4/)/sub 2/S/sub 2/O/sub 8/, (2) chemical synthesis with an excess of FeCl/sub 3/, (3) electrochemical synthesis in HCI and in NH/sub 4/F.2.35HF eutectic. As proved by dynamic LS, emeraldine base dissolved in NMP shows a strong aggregation, leucoemeraldine much less, so that accurate MW determinations by GPC are made on the latter one dissolved in 2% v/v hydrazine in NMP. The as-synthesised PANIs show a bimodal distribution of MW which may be suppressed by extraction of the low MW components. As determined by viscometry in 95% H/sub 2/SO/sub 4/, the stifftess of the chains progressively increases with the increase of the oxidation degree. The M/sub w/ of PANI synthesised by the methods (1) and (2) (vs PS standards) is in the region of 50,000. The M/sub w/ of PANI synthesised by the method (1) using organic acids is in the region of 12,000. The different MW distributions will be presented and correlated with the conditions of synthesis.
Starting Page	340
Ending Page	340
File Size	93908
Page Count	1
File Format	PDF
DOI	10.1109/STSM.1994.835410
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-07-24
Publisher Place	Korea
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Propellants Humidity measurement Electric variables measurement Conductivity measurement Eigenvalues and eigenfunctions Oxidation Polymers Conducting materials Equations Electrons
Content Type	Text
Resource Type	Article

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