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Submitted on 1 Jan 1983
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A NEW ”PROCESSABLE” POLYACETYLENE MODIFICATION
J. Hocker, G. Schneider
To cite this version:
J. Hocker, G. Schneider. A NEW ”PROCESSABLE” POLYACETYLENE MODIFICATION. Journal
de Physique Colloques, 1983, 44 (C3), pp.C3-147-C3-149. �10.1051/jphyscol:1983328�. �jpa-00222679�
JOURNAL DE PHYSIQUE
Colloque Ci, supplément au nQ6, Tome 44, juin 1983 page C3-147
A NEW "PROCESSABLE" POLYACETYLENE MODIFICATION J. Hocker and G. Schneider
Zentrale Forschung und Entwicklung der Bayer AG, D-5090 Leverkusen, F.R.G.
Résumé - En utilisant un catalyseur spécial de type Ziegler-Natta ainsi que des conditions de réaction spéciales, il est possible de polymériser l'acétylène pour obtenir une nouvelle modification du polyacétylène.
Abstract - Using a special catalyst on the Ziegler-Natta basis and special reaction conditions it is possible to polymerize acetylene for obtaining a new polyacetylene modification with burr- or fibre-shaped particles which can be processed to foils, non-wovens and coatings.
A great number of catalysts have been tested for polymerizing acetylene. Depending on both the catalyst system and reaction conditions either amorphous or partly crystalline powders and foils are obtained (1,2, 3 ) . These are, however, insoluble and unmeltable and, thus, not suitable for processing after conventional plastics technologies. Processability of a polymeric conductor is, however, a prerequisite for its practical use.
We have now found that a new, burr- or fibre-shaped polyacetylene modification is obtained when the acetylene is polymerized at about -6CPc by stirring with the Ziegler-Natta catalyst system Al(alk)3/VOCl(neopentyl)2.
Variation of the reaction conditions results in particle sizes of from 0.01 to 5 mm.
The thus obtained polyacetylene modification (suspension) can be used for processing according to methods of non-woven technology:
Fig. 1 Burr-shaped polyacetylene. Fig. 2 Fibre-shaped polyacetylene.
Light micrograph Light micrograph.
Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1983328
C3-148 JOURNAL. DE PHYSIQUE
1. for the production of f o i l s of any desired surface and thickness. These f o i l s , which can be produced by f i l t e r i n g off the suspension, show a greater density than the f o i l s a f t e r Shirakawa. When treated with conventional doping agents l i k e AsF5, FeCl3 or 12, they are oxidizing t o conductive polyacetylene.
2. Mixed-co~nent non-mvens corrppsing of conventional non-mven materials of any desired dimensions.
3 . For coatings on a variety of substrates such as glass, metal, f o i l s and mulded
a r t i c l e s made from plastics material. These coatings, which can be produced according to a spraying method with the aid of e.g. patterns in any desired geometric dimension, show under both undoped and weakly doped conditions an excellent adhesion even on substrates l i k e polyethylene.
It i s , therefore, possible f o r the f i r s t tire of having polyacetylene processed in a reproducible way t o obtain large-faced f o i l s and coatings.
Experiments of orientation made in secondary batteries revealed that the new poly- acetylene mdification also possesses advantages compared t o conventional p l y - acetylene ( 4 ) .
This m r k has been supported by the "Bundesminister fiir Forschung und Technologic", under Contract No. NT 2023. However, the authors are responsible for i t s contents.
Fig. 3 Fibre of a bwr-shaped Fig. Polyacetylene f o i l prepared from polyacetylene particle. a suspension containmg k r - Transmiss ion electron micrograph. shaped particles (cross-section)
.
Raster electron micrograph.
231 (1971);
G. Lieser, G. Wegner, W. Miiller, V.
Enkelmann, Makroml. Chem. Rap.
C~~TTUI.
l r
621 (1980) ;B. Broich, J. Hocker, Ber. Bunsenges.
Phys. Chem., 1983 t o be published.
, --
Fig. 5 Polyacrylonitrile non-muen containing 50 '% of polyacety f i b r e s (cross-section)
.
Raster electron micrograph.
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