Syndiotactic Polyolefins by Hydrogenation of Highly Stereoregular 1,2 Polydienes: Synthesis and Structural Characterization.

Some syndiotactic-rich polyolefins, generally difficult to synthesize through stereospecific polymerization of the corresponding monomers, were prepared by homogeneous non-catalytic hydrogenation of syndiotactic 1,2 poly(1,3-diene)s with diimide, arising from thermal decomposition of p-toluene-sulfonyl-hydrazide. All the polymers synthesized were structurally characterized by means of several analytical techniques, such as FT-IR, NMR (H, C and 2D), DSC, and GPC, and herein illustrated.

Ethylene--α-Olefin Copolymers by Hydrogenation of Highly Stereoregular -1,4 Polydienes: Synthesis and Structural Characterization.

The homogeneous non-catalytic hydrogenation of several types of iso- and syndiotactic -1,4 poly(1,3-diene)s with diimide, formed by thermal decomposition of -toluene-sulfonyl-hydrazide, was examined. Perfectly alternating ethylene/1-alkene copolymers having different tacticity (i.e.

Novel Cobalt Dichloride Complexes with Hindered Diphenylphosphine Ligands: Synthesis, Characterization, and Behavior in the Polymerization of Butadiene.

Two novel cobalt diphenylphosphine complexes were synthesized by reacting cobalt(II) chloride with -butyl(diphenyl)phosphine (PBuPh) and ()-(+)neomenthyldiphenylphosphine [()-NMDPP]. The crystal structure of the former was determined by single-crystal X-ray diffraction studies. The two complexes were then used in combination with methylaluminoxane (MAO) for the polymerization of 1,3-butadiene: crystalline highly syndiotactic 1,2 poly(1,3-butadiene)s were obtained, with a 1,2 content and a syndiotactic index (percentage of syndiotactic triads []) up to 95% and 85%, respectively.

Isotactic and Syndiotactic Alternating Ethylene/Propylene Copolymers Obtained Through Non-Catalytic Hydrogenation of Highly Stereoregular cis-1,4 Poly(1,3-diene)s.

The homogeneous non-catalytic hydrogenation of -1,4 poly(isoprene), isotactic -1,4 poly(1,3-pentadiene) and syndiotactic -1,4 poly(1,3-pentadiene) with diimide, formed by thermal decomposition of -toluenesulfonylhydrazide, is examined. Perfectly alternating ethylene/propylene copolymers having different tacticity (i.e.