Macroporous copolymers of poly(acrylonitri1e-co-divinylbenzene) were synthesized in the presence of 2-ethyl-1-hexanol (2EH) and toluene as diluents. The copolymers were characterized by acrylonitrile content and from morphological point of view. Samples with a minimum content of homopolymer were transformed into weak base anion exchangers by the aminolysis-hydrolysis reaction of the nitrile groups with N,N-dialkylaminoalkylamines. The reactions were investigated by the exchange capacity variation and IR-spectral analysis. It was emphasized thnt the reactivity of asymmetrical diamines depends on the nucleophilicity of the primary amine group.
ZUSAMMENFASSUNG:Makroporose Acrylnitril-Divinylbenzol-Copolymere wurden in Gegenwart von 2-Ethyl-I -hexan01 oder Toluol als Verdunnungsmittel hergestellt und bezuglich des Acrylnitrilgehalts und der Struktur charakterisiert. Die Proben mit dem geringsten Homopolymeranteil wurden durch Aminolyse-Hydrolyse der Nitrilgruppen mit N,N-Dialkylaminoalkylaminen in schwach basische Anionenaustauscher transformiert. Aus den Austauschkapazitaten und IR-spektroskopischen Untersuchungen geht hervor, daR die Reaktivitat der asymmetrischen Diamine von der Nucleophilie der primaren Amingruppe abhangt.
Orientational properties of rubbed thin polymer layers with vinylic backbone and different side groups are presented. Some of these polymers lead to the alignment of LC molecules parallel to the rubbing direction whereas other polymers impose a perpendicular orientation. The stability of the obtained alignment as function of the temperature was tested.
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