Title:	Tailor-Made Polymers
Other Titles:	Via Immobilization of Alpha-Olefi n Polymerization Catalysts
Authors:	R. Severn, John C. Chadwick, John
Keywords:	Tailor-Made Polymers
Issue Date:	2008
Publisher:	Wiley-VCH
Description:	Polyolefi ns represent approximately 50% by weight of all commodity and com- modity- p lus polymers, which in turn amounts to about 90% by weight of the global polymer production. Today, literally hundreds of polyolefi n grades are available commercially, with an incredible variety of properties and applications, ranging from ultra -r igid thermosets (stiffer than steel, but with the premium of a much lower density) to high - performance elastomers, via all conceivable thermoplastic and elastoplastic materials in between. Yet, if one looks at their chemical composi- tion, polyolefi ns are surprisingly limited: polyethylene, polypropylene, a few copo- lymers of ethene with propene or another alpha- olefi n, and little else. The key reason for this apparent contradiction is the unique and thorough molecular control of the polymerization process that modern transition metal - based catalysts are able to provide. With the correct choice of catalyst system and reaction condi- tions, it is possible to produce polyolefi n materials with precisely defi ned and tunable chain microstructures and molecular mass distributions; this translates into a correspondingly fi ne control in the way such chains crystallize (when they are able to) and fl ow. In addition, a rich toolbox for supramolecular material design provides almost unlimited possibilities for further tailoring and diversifi cation by means of intelligent processing, blending and additives formulations and technologies.
URI:	http://10.6.20.12:80/handle/123456789/76559
ISBN:	978-3-527-31782-0
Appears in Collections:	Chemistry

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