The present invention provides efficient processes for preparing brush polymers. In general, the process comprises three distinct reaction steps utilizing two separate catalysts. In the first step, the initiating compound comprising norbornene is contacted with a silane in the presence of a catalyst, thereby forming a silated intermediate. This silated intermediate is then contacted with a monomer in the presence of a catalyst via Group Transfer Polymerization (GTP). The resulting compound from GTP is contacted with a ring opening metathesis polymerization (ROMP) catalyst to prepare the brush polymer. Surprisingly, the brush polymers obtained from the above process are accessed in an efficient and rapid GTP methodology as compared to prior methods.

A method of light-promoted frontal ring-opening metathesis polymerization includes providing a monomer solution including dicyclopentadiene, a ruthenium-based catalyst and a phosphite inhibitor, and exposing the monomer solution to ultraviolet light having a wavelength in a range from 315 nm to 400 nm, thereby initiating an exothermic polymerization reaction and generating a self-propagating polymerization front. The polymerization front moves through the monomer solution and polymerizes the dicyclopentadiene.

Embodiments in accordance with the present invention encompass a two component composition containing in one component a latent organo-ruthenium carbide catalyst, and in another component a photoactive acid generator or a thermally active acid generator, and either of the components containing a mixture of photoactive compound along with one or more monomers which undergo ring open metathesis polymerization (ROMP) when said components are mixed together and exposed to a suitable radiation (or heat) to form a three-dimensional (3D) object. The three-dimensional objects so formed exhibits improved mechanical properties, particularly, high heat distortion temperature, impact strength, elongation to break, among others. Accordingly, compositions of this invention are useful as 3D inkjet materials for forming high impact strength objects of various sizes with microscale features lower than 100 microns, among various other uses.

The present disclosure generally relates to interfaces and techniques for media playback on one or more devices. In accordance with some embodiments, an electronic device includes a display, one or more processors, and memory. The electronic device receives user input and, in response to receiving the user input, displays, on the display, a multi-device interface that includes: one or more indicators associated with a plurality of available playback devices that are connected to the device and available to initiate playback of media from the device, and a media playback status of the plurality of available playback devices.

Described herein are compositions and methods for generating dental products or orthodontic products. The compositions and methods comprise latent ruthenium complexes and photoacids and/or photoacid generators.

A rubber composition containing: a solid rubber (A) having a weight-average molecular weight (Mw) of 100,000 or more; and a liquid monocyclic olefin ring-opened polymer (B) having a weight-average molecular weight (Mw) of 1,000 to 50,000, wherein a proportion of the liquid monocyclic olefin ring-opened polymer (B) is 1 to 100 parts by weight per 100 parts by weight of the solid rubber (A).

Chemically inert, mechanically tough, cationic metallo-polyelectrolytes designed as durable anion-exchange membranes (AEMs) via ring-opening metathesis polymerization (ROMP) of cobaltocenium-containing cyclooctene with triazole as the only linker group, followed by backbone hydrogenation to provide a new class of AEMs with a polyethylene-like framework and alkaline-stable cobaltocenium cation for ion transport, which exhibit excellent thermal, chemical and mechanical stability, as well as high ion conductivity.

Described herein are compositions and methods for processing photopolymers based on olefin metathesis. The compositions and methods comprise latent ruthenium complexes and photoacids and/or photoacid generators.

A method for preparing an article includes at least a first component of a polyolefin in conjunction with a second component of a polymer made by ring-opening metathesis polymerisation of norbornene type monomers. The method includes pre-treating a surface of the first component, applying a ring-opening metathesis polymerisable mixture of norbornene type monomers and a catalyst to the surface, and curing the ring-opening metathesis polymerisable mixture in contact with the surface, wherein the ring-opening metathesis polymerisable mixture has a η.sub.1000 at 30° C. of more than 9 sec. Articles such as a pipe line field joint or a protective element for a concrete tunnel lining element can be made using the method.

Gas separation membranes are provided and more particularly, a series of addition-type and ROMP type polynorbornenes with substituents derived from Mizoroki-Heck reactions are provided and have particular utility as gas separation membranes for natural gas upgrading.