... a catalyst. Though the resulting material was highly crystalline and of regular structure, it was a black, air-sensitive, infusible and insoluble powder. Ziegler-Natta polymerisation was developed for polymerising alkenes such as ethylene by inserting an unsaturated molecule into the carbon-titanium bond of the growing macromolecule. It depends greatly on the activity of the choice of ... They may possibly find a use in supermarket checkouts. Poly(pyrrole) has been tested as microwave-absorbing "stealth- (radar-invisible) screen coatings and also as the active thin layer of various sen...

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• Grade Level: High School