Structural defects in undoped trans-polyacetylene, before and after air oxidation, studied by DNP-enhanced 13C NMR

Autor:	R.A. Wind, J. Vriend, M.J. Duijvestijn
Rok vydání:	1985
Předmět:	Chemistry Oxide chemistry.chemical_element General Chemistry Nuclear magnetic resonance spectroscopy Carbon-13 NMR Condensed Matter Physics Photochemistry Oxygen chemistry.chemical_compound Polyacetylene Materials Chemistry Organic chemistry Methylene Polarization (electrochemistry)
Zdroj:	Solid State Communications. 56:713-716
ISSN:	0038-1098
DOI:	10.1016/0038-1098(85)90785-9
Popis:	The presence of structural defects in undoped trans-polyacetylene, both before and after air oxidation, has been investigated by means of 13C NMR CPMAS experiments. To increase the sensitivity the 13C signals have been enhanced via Dynamic Nuclear Polarization. It has been found that by nature our sample contains about 0.5% methyl groups and 2.7% methylene groups and/or cross-links. Air inlet manifests itself mainly in the formation of ethene oxide groups, oxygen bridges, hydroxyl groups and carbonyl groups, with a total percentage of 47% after 4 months.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::19375add3fc2727c7d95a0ba5f035d61 https://doi.org/10.1016/0038-1098(85)90785-9 Zobrazit plný text záznamu