Determination of inorganic compounds in polyolefines

Description

High strength polymers are usually resistant to higher temperature and to many solvents. For trace metal determinations dissolved samples are necessary and such sample requires a rigorous sample preparation step. In many cases this includes a microwave digestion procedure [1, 2]. Many analytical methods are available for the determination of trace metals, including atom absorption spectroscopy (AAS), optical emission spectroscopy (OES) and inductively coupled plasma mass spectrometry (ICPMS). ICP-MS methods for trace metal determination achieve low detection limits and fast analysis times [3]. In this work typical elements like aluminum, titanium and magnesia from different catalyst systems (e.g. Ziegler-Natta-catalyst or metallocenes) which were used for preparing polyolefines including homopolymers and copolymers were determined with ICP-MS and previous microwave digestion. Different acids and their mixtures e.g. nitric acid, hydrofluoric acid, phosphoric acid and sulfuric acid were used for sample dissolution. High-pressure (100 bar) closedvessels were used for the microwave digestion and temperatures from 200 to 270 °C. It was found that stirring during the microwave digestion was very important. The resulting digests were analyzed by ICP-MS. Detection limits for those elements were lower than 1 ppb.

Period	23 Sept 2015
Event title	16 th Austrian Chemistry Days
Event type	Conference
Location	AustriaShow on map