1.1. Inspired by Nature In many enzymes, such as ureases (Figure 1), two or more metal
centers are poised in close proximity to activate both electrophilic and nucleophilic …

Staudinger predicted a correlation between the physical properties of a polymer and its main-
chain stereochemistry as early as 1929. 1 However it was not until 1947 that Schildknecht …

The Polymeric Materials Encyclopedia presents state-of-the-art research and development
on the synthesis, properties, and applications of polymeric materials. This groundbreaking …

This article reviews the recent developments of Ziegler-Natta and metallocene catalysts for
olefin polymerizations. The roles of magnesium dichloride and electron donors on the …

Yttrium alkyl complexes Y (η5: η1-C5Me4SiMe2NCMe2R)(CH2SiMe3)(THF)(R= Me, Et) and
Y (η5: η1-C9H6SiMe2NCMe3)(CH2SiMe3)(THF) can be prepared in high yields by a σ …

This communication reports the styrene homopolymerization behavior and ethylene−
styrene copolymerization behavior of the covalently linked bimetallic constrained geometry …

Abstract Models for chain packing for ordered and disordered modifications of the α-form of
syndiotactic polystyrene are suggested, through quantitative comparisons between X-ray …

We consider the four criteria recently proposed by one of us (JMG) for defining a
thermoreversible gel and use them with syndiotactic polystyrene/solvent systems. We show …

Selected examples concerning effects of both cyclopentadienyl fragment (Cp′) and anionic
donor ligand (Y) in nonbridged modified half-titanocenes of the type, Cp′ TiX2 (Y)(X …

The empty space in different crystalline and clathrate phases of syndiotactic polystyrene (s-
PS) is evaluated by a numerical procedure. It is shown that the δ form is nanoporous and …