A series of vinyl addition block polymers derived from functionalized norbornene monomers are disclosed and claimed. Specifically, a series of diblock and triblock polymers derived from norbornene monomers are disclosed. Also disclosed are the method of preparation of such block polymers, and their use in the fabrication of membranes which exhibit unique separation properties.

Disclosed herein is a dental material containing a polymerizable hydrolysis stable polycyclic amide monomer. The present disclosure relates to methods of making and use of the polymerizable hydrolysis stable polycyclic amide monomer for the preparation of a dental polymerizable hydrolysis stable polycyclic amide monomer composition. The present disclosure further relates to a cured dental material obtained by polymerizing the dental material.

Disclosed herein is a dental material containing a polymerizable hydrolysis stable polycyclic amide monomer. The present disclosure relates to methods of making and use of the polymerizable hydrolysis stable polycyclic amide monomer for the preparation of a dental polymerizable hydrolysis stable polycyclic amide monomer composition. The present disclosure further relates to a cured dental material obtained by polymerizing the dental material.

A prepolymer and a resin composition containing the prepolymer are provided. The prepolymer is obtained from a prepolymerization reaction of a mixture, the mixture at least including dicyclopentadiene-ethylidenenorbornene copolymer and acenaphthylene in a weight ratio of between 1:1 and 5:1. The resin composition may be used to make various articles, including a resin film, a prepreg, a laminate or a printed circuit board, and at least one of the following properties can be improved, including dielectric constant, dissipation factor, copper foil peeling strength, X-axis coefficient of thermal expansion and glass transition temperature.

A prepolymer and a resin composition containing the prepolymer are provided. The prepolymer is obtained from a prepolymerization reaction of a mixture, the mixture at least including dicyclopentadiene-ethylidenenorbornene copolymer and acenaphthylene in a weight ratio of between 1:1 and 5:1. The resin composition may be used to make various articles, including a resin film, a prepreg, a laminate or a printed circuit board, and at least one of the following properties can be improved, including dielectric constant, dissipation factor, copper foil peeling strength, X-axis coefficient of thermal expansion and glass transition temperature.

An improved catalyst for cyclic olefin polymerization. The catalyst includes a transition metal carbene having the following structure: M.sup.v(OR).sub.c*mX.sub.(v-c*m-2)C(R*).sub.2 wherein M.sup.v is a Group 5 transition metal having a valence (v) of 5 or a Group 6 transition metal having a valence (v) of 5 or 6; each R is independently a monovalent organic moiety comprising from 8 to 40 atoms selected from Groups 14-17; c is an integer from 1 to 3; m is 1/3, 1/2, 1, 3/2, 2, 3, or 4 and c*mv2; X is a halogen; and each R* is independently H or a C.sub.1 to C.sub.7 alkyl. The catalyst is particularly useful for ring-opening metathesis polymerization (ROMP).

An improved catalyst for cyclic olefin polymerization. The catalyst includes a transition metal carbene having the following structure: M.sup.v(OR).sub.c*mX.sub.(v-c*m-2)C(R*).sub.2 wherein M.sup.v is a Group 5 transition metal having a valence (v) of 5 or a Group 6 transition metal having a valence (v) of 5 or 6; each R is independently a monovalent organic moiety comprising from 8 to 40 atoms selected from Groups 14-17; c is an integer from 1 to 3; m is 1/3, 1/2, 1, 3/2, 2, 3, or 4 and c*mv2; X is a halogen; and each R* is independently H or a C.sub.1 to C.sub.7 alkyl. The catalyst is particularly useful for ring-opening metathesis polymerization (ROMP).