Sterically crowded diimine ligands with five aryl rings were prepared in one step in good yields using a micro-flow technique. X-ray crystallographic analysis revealed the detailed structure of the bulky ligands. The nickel complexes prepared from the ligands exerted high polymerization activity in the ethylene homopolymerization and copolymerization of ethylene with polar monomers.

We study the transition of polymers in the dilute regime from a swollen shape at high temperatures to their low-temperature structures. The polymers are modeled by a single self-avoiding walk (SAW) on a lattice for which l of the monomers (the H monomers) are self-attracting, i.e., if two nonbonded H monomers become nearest neighbors on the lattice they gain energy of interaction (epsilon = -/e...

Copolymerization of ethylene with polar vinyl monomers to yield functionalized and possibly easier recyclable polyolefins is challenging it currently being pursued mainly using expensive Pd-based catalysts. Herein, the copolymerization methyl acrylate (MA) achieved by dibenzocycloheptyl-substituted aryliminopyridyl Ni(II) complexes, affording copolymers selectively in-chain incorporated MA unit...

We present an algorithm for the exhaustive enumeration of all monomer sequences and conformations of short lattice proteins as described by the hydrophobic–polar (HP) model. The algorithm is used for an exact identification of all designing sequences of HP proteins consisting of up to 19 monomers whose conformations are represented by interacting self–avoiding walks on the simple cubic lattice....

In this paper we report on how to increase the selectivity of gas sensors by using fluoropolymer membranes. The mass transport of polar and non-polar gases through a polymer membrane matrix was studied by systematic selection of polymers with different degrees of fluorination, as well as polymers whose monomers have ether groups (-O-) in addition to fluorine groups (-F). For the study, a set of...

Prevailing trend towards the use of lighter and lower cost engineered plastics in automotive, construction, aerospace, electronics and other industrial end uses have created a need for pressure sensitive materials that can bond well to these new, inherently low surface energy plastics. Reported herein are novel all acrylic compositions with inherently lower surface energy that display significa...