'Bound but not gagged': Immobilizing single-site alpha-olefin polymerization catalysts

Article Abstract:

The future of alpha-olefin polymerization catalysis is reviewed in relation to single-site catalyst immobilization. The exact interactions and mechanisms at work on the support surface during the immobilization, activation, and polymerization steps, the effects of local environments (pore size) and how one effectively characterizes the catalytically active species on a support, especially at low loading is still unanswered.

Netherlands, Polyolefin Resins, Polyolefins

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Biocatalysis in supercritical fluids, in fluorous solvents, and under solvent-free conditions

Article Abstract:

Details regarding the enzyme-catalyzed reactions investigated in SCFs, fluorous solvents and solid to solid/eutectic mixtures are presented. It is found that scC[O.sub.2] is the one of the best SCF choice for biocatalysis as it is cheap, readily available and considered the most green of the SCFs with suitable critical parameters.

United States, All Other Basic Organic Chemical Manufacturing, Industrial organic chemicals, not elsewhere classified, Industrial Organic Chemicals, Supercritical Fluids, Fluorocarbons, Carboxylation

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Controlled ring opening polymerization of lactide and glycolide

Article Abstract:

Biodegradable polymers known as linear aliphatic polyesters are particularly attractive and the most used, especially those derived from lactic acid (PLA), glycolic acid (PGA) and their co polymers (PLGA). The kind of polymerization exhibited by Lactic and glycolide acids and the polymers thus formed are discussed.

Science & research, Degradable Plastics, Alkyd & Polyester Resins, Research, Methods, Polyesters, Biodegradable plastics

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