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2 Polish Journal of Applied Chemistry

2 2011

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Gold(I) recovery by functionalized vinylbenzyl chloride-divinylbenzene copolymer gels bearing amino ligands

Pilśniak-Rabiega M.

Polish Journal of Applied Chemistry

2011

Vol. 55, nr 3-4

133-140

The functional resins with amino ligands were synthesized by the modification of vinylbenzyl chloride- divinylbenzene copolymers gels (VBC/DVB) with the aliphatic and aromatic amines. Two methods of modification were employed, the first one was traditional heating of the polymer with either neat amine or amine solution in an appropriate solvent, the second method was heating of reaction mixture in a microwave reactor. These polymeric materials were characterized using nitrogen and chlorine elemental analysis. The polymeric resins were used for the removal of gold from ammonium buffer that contains 100 g/L NHrH20 and 50.0 g/L (NIL^SO.!. All resins were highly selective for the gold(I) from ammonia solution and they did not sorb ammine complexes of copper(II).

Changes in appearance and chemical structure of chosen polymer materials under accelerated aging

Brzozowska-Stanuch A., Rabiej S., Stanuch W.

Polish Journal of Applied Chemistry

2011

Vol. 55, nr 3-4

123-132

Polymers, due to their versatility, have become indispensable in human life. In outdoor applications, all polymers degrade, resulting in a change in the properties of most polymers. Symptoms of polymer degradation include changes in esthetic appearance (e.g. discoloration, changes in gloss, chalking) and alteration of some specific polymer properties. In this study, polyamides 6 and 6.6 and polypropylene were subjected to UV irradiation and high temperature. The degradation was monitored using colour measurement and FTIR spectroscopy. The effect of deterioration in the material surface due to aging can be seen in its changes in colour (by altering its chemical structure), gloss and transparency. The colour measurement was performed in CIELAB system in tristimulus colour value L', a', b". FTIR spectroscopy measurements made it possible to show in a systematic way the changes in molecular structure of tested materials according to the process of aging, as well as possible mechanism of degradation.