67 results about "Grubbs' catalyst" patented technology

The invention provides a cross-linkable high dielectric norbornene copolymer. The cross-linkable high dielectric norbornene copolymer comprises a norbornene block copolymer which is formed by ring-opening metathesis polymerization of an endo-configuration norbornene monomer or an exo-configuration norbornene monomer and an exo-configuration oxa-norbornene monomer. The invention also provides a preparation method of the norbornene copolymer. According to the preparation method, the norbornene copolymer is obtained by ring-opening metathesis polymerization reaction of the endo-configuration norbornene monomer or the exo-configuration norbornene monomer and the exo-configuration oxa-norbornene monomer under the action of a Grubbs catalyst. The invention further provides a three-dimensional cross-linked network polymer formed by crosslinking of the norbornene copolymer and a preparation method thereof. The norbornene copolymer has a relatively high dielectric constant and very low dielectric loss. The preparation method of the norbornene copolymer is simple and practicable. The norbornene cross-linked polymer has relatively high dielectric constant and thermal stability, and the applied range of the norbornene crosslinked polymer in the field of thin-film capacitors is expanded.

The present invention relates to the technical field of spray-coated polyurea elastomer, and provides a spray-coated polyurea elastomer and a preparation method thereof. The preparation includes the following steps: step S100, preparing self-repairing microcapsules: using solid particle emulsifier, phenol, aldehyde, Prepare self-healing microcapsules by reacting deionized water, polyphenols, ammonium chloride, and dicyclopentadiene; step S200, preparing component A: polyetheramine, self-healing microcapsules, fiber filler, diethyltoluenediamine, The Grubb catalyst is mixed and stirred evenly; step S300, preparation of component B: mixing isocyanate and polyether polyol, and reacting to obtain an isocyanate prepolymer; step S400, preparation of sprayed polyurea elastomer: through a spraying machine, the components A and Component B is sprayed on the surface of the substrate at a volume ratio of 1:1, and reacted to obtain a sprayed polyurea elastomer. The sprayed polyurea elastomer provided by the invention has self-repair function, and has good mechanical properties and chemical corrosion resistance.

The present invention relates to a kind of novel synthetic method of 4a, 8a borazine and derivatives thereof, and its synthetic steps comprise: (1) diallylamine reacts with boron trichloride at low temperature, generates diallyl Amino boron dichloride; (2) diallylamino boron dichloride reacts with allyl Grignard reagent at low temperature to generate diallylamino diallyl borane; (3) diallyl Aminodiallylborane uses Grubbs first-generation catalyst to trigger olefin metathesis into ring reaction; (4) the ring-forming product and dichlorodicyanobenzoquinone undergo dehydroaromatization reaction to generate 4a, 8a-borazepine Naphthalene; (5) 4a, 8a-borazine and halogenated succinimide undergo a halogenation reaction under Lewis acid catalysis to generate 4a, 8a-borazine derivatives substituted by halogen at the 4 / 5 position. The invention has simple steps, cheap and easy-to-obtain raw material sources, mild reaction conditions, less side reactions, and simple and efficient post-treatment process.

The invention discloses a process method for preparing cryptand 222. The process method comprises the following steps: 1, taking tris[(2-ethylnenoxy)ethyl]amine as a raw material, and reacting to obtain an intermediate under catalytic actions of a Grubbs catalyst and alkali metal salts; and 2, adding a hydrogen source into the intermediate obtained in the step 1 under the catalytic action of a hydrogenation catalyst, and reacting, thereby obtaining the cryptand 222. The process method disclosed by the invention has the beneficial effects of short synthesis period and high yield.