Poly(norbornene carboxylic acid ester)s: Synthesis and properties

Abstract

The vinylic polymerization of 5-norbornene-2-carboxylic esters with different palladium catalysts to polymers of high molecular weights is reported. Computer simulations based on a force field approach show that these polymers display a rigid statistical chain conformation and are thus a further example of rotationally strongly constrained polymers. The polymers are soluble in a variety of solvents despite their rigidity, they are amorphous, possess glass transition temperatures well above 250°C, and have a high packing density. The dipoles located in the lateral groups perform a secondary relaxation process similar to the case of flexible or rigid rod-like polymers containing ester groups. Acta Polymer., 48,385-391 Q VCH Verlagsgesellschaft mbH, D-69451 Weinheim 1997 0323-7648/97/0808-0385$17.50+.50/0 385

The Vinyl Homopolymerization of Norbornene

“…Poly(norbornene-carboxylic esters) could be obtained in relatively high yields and high molecular weights by the catalyst system 23. [72] Follow-up studies with these novel catalyst systems included norbornene derivatives and copolymerization. [73,74] The induction of stereoregularity into poly(norbornene) requires a chiral and C 2 -symmetric ligand arrangement around the active metal center.…”

Poly(norbornene imide)s: synthesis and simulations

“…The density turned out to be 1.247 g/cm 3 for the polynorborneneimide as compared to a density of about 1.092 g/cm 3 for the unmodified polynorbornene. The lateral substitution with an aromatic imide substituent leads thus to a significant increase of the density.…”

“…Molecules of this type have been termed "single chain glasses" for this reason 2) . Substituted polynorbornenes such as poly(5-norbornene-2-carboxylic esters) 3) and poly(5-norbornadiene-2,3-dicarboxylic esters) 4) also correspond to this type of chain molecules displaying a rigid statistical chain conformation 5) even at elevated temperatures. In the present communication, we report on the vinylic polymerisation of exo N-o/m/p tolyl (Io/Im/Ip)-nadimides using a Pd(II) catalyst.…”

Insertion of CO and Strained Olefins into Organometallic (Ferrocenylmethyl)phosphane Palladium Complexes

“…Late-transition metals, particularly nickel and palladium, are active catalysts for addition polymerization. [24] Several palladium complexes [7c-7e, [25][26][27][28][29][30] have been successfully employed as precatalysts for the vinyl addition polymerization of NBE.…”