ISSN:
1436-2449
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
,
Maschinenbau
,
Physik
Notizen:
Summary The magnetic properties of poly(2-(3,5-diethynylenephenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1-oxyl-3-oxide) (4), a polymer with conjugated backbone and stable radicals in side groups, were investigated between 78 and 300 K with magnetic flux densities B between 0.42 and 1.32 Tesla. Samples prepared by evaporation of the solvent from the polymer solution exhibited normal paramagnetism. Samples precipitated by addition of a nonsolvent (n-hexane) to a polymer solution showed a dependence of the magnetic mass susceptibility $$\chi _m $$ on B. This behavior is described by superposition of a paramagnetic term and a temperature-independent term depending on B. In addition, an increase of $$\chi _m $$ T with decreasing temperature T was observed below 150 K.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00297418
