A high-performance polycyanurate network derived from 4,4′-biscyanato-2,2′-trifluoromethylbiphenyl

Cyanate Ester Monomers and Oligomers. Overview of the Modern Research State and Perspectives

A hybrid cyanate ester resin containing polysilazane was prepared via the prepolymerization of bisphenol-A dicyanate ester monomer (BADCy) in the presence of polysilazane (PSZ) under low temperatur...

Preparation of hybrid cyanate ester resin in the presence of polysilazane and its properties

An experimental study was made on p-tert-Butylcalixarene separation and enrichment of Cr(Ⅲ) and Cr(Ⅵ) compounds.The experimental results show that p-tert-Butylcalix[4]arene can well separate and enrich Cr(Ⅲ) in the circumstances of pH=6 and 1mol/L HCl as elution solvent.Common ions in water affect little on the process of enrichment and separation.The enrichment content of Cr(Ⅲ) is 3.3×10~3 μg/g.The p-tert-Butylcalix[4]arene is applied to environmental water sample and the recovery rate of Cr(Ⅲ) is more than 90.0%.The result is satisfactory.Meanwhile the experimentation indicated Ptert-Butylcalix[4]arene can not enrich Cr(Ⅵ) compound.

P-tert-Butylcalix[4]Arene Separation and Enrichment of Cr(III) and Cr(VI)

p-tert-Butylcalix[4]arene-derived cyanate ester resins, both single and binary systems, were synthesized and studied for their thermal properties. The results showed that pure calixarene cyanate es...

Calixarene–based cyanate ester resin for high-temperature material:

The invention belongs to the technical field of synthesis of cyanate type compounds and relates to a preparation method of a fluorine-containing cyanate monomer. The method comprises the following steps: step 1, adding a solvent and cyanogen halide; stirring to completely dissolve the cyanogen halide; step 2, under violent stirring, slowly dropwise adding triethylamine and a solution of a fluorine-containing bisphenol compound, wherein the dropwise adding speed of the triethylamine is slightly smaller than the dropwise adding speed of the fluorine-containing bisphenol compound; controlling thereaction temperature to be -20 to 0 DEG C; finishing dropwise adding after 2 to 10 h; then continually stirring for 1 to 3 h and stopping reaction; step 3, after standing for 1 to 5 h, filtering to obtain a fluorine-containing bisphenol cyanate resin crude product and then purifying. The invention provides the method for synthesizing the fluorine-containing cyanate monomer so that the preparationof the fluorine-containing cyanate monomer becomes possible.

Preparation method of fluorine-containing cyanate monomer

The invention relates to a cyanate ester resin latent catalyst and a preparation method thereof, and belongs to the technical field of preparation of catalytic cyanate ester resin and a composite material thereof. According to the cyanate ester resin latent catalyst prepared by adopting a microcapsule technology, when the prepreg needs to be cured,microcapsules are broken after proper pressure ortemperature is applied on the prepreg, and a curing agent enters a matrix, so that the purpose of catalyzing the curing of a cyanate ester resin is achieved. In addition, the latent catalyst/cyanate ester resin prepreg disclosed by the invention also has better paving manufacturability and is beneficial to forming of the cyanate ester resin-based composite material. The application range of the cyanate ester resin-based related material is widened, and the application prospect is wide. The latent catalyst and the cyanate ester resin prepreg can be used for preparing a skin for a wave-transparent structure integrated part, meet the requirement of an antenna radome and other parts for high wave-transparent rate, can also be used as a copper-clad plate base material, and can be widely appliedto the fields of electronics, aviation and aerospace.

Preparation method of latent catalyst andcyanate ester resin prepreg

The invention belongs to the field of industrial synthesis of organic compounds, and particularly relates to a cyanogen bromide industrial purification process and equipment. The equipment comprises two thermometers (1), a first jacket (3), a first-stage distillation kettle (4), a second-stage distillation kettle (5), a cyanogen bromide collector (6), a first gas guide pipeline (7), a second jacket (8) and a second gas guide pipeline (9). According to the invention, the yield of primary distillation can be increased, and high-purity and high-yield industrial preparation of cyanogen bromide isrealized through secondary distillation and purification. The distillation process is stable and safe, and the problem that cyanogen bromide steam is easy to crystallize in a conveying pipeline to block the pipeline is avoided.

Cyanogen bromide industrial purification process and equipment

The invention belongs to the field of synthesis of organic polymers, and particularly relates to a cyanate ester resin synthesis method. According to the method, the cyanogen halide and the bisphenolcompound are dissolved in the same solvent at the same time, and then a triethylamine/isopropanol catalyst is dropwise added into the solvent, so that the reaction time can be shortened, the reactionefficiency can be improved, the use amount of the solvent can be reduced, the problems of dissolution and dropwise addition of the bisphenol compound can be avoided, and the method is also suitable for some indissolvable special phenols. By adopting a triethylamine/isopropanol synthesis system, side reactions can be reduced, and the product purity can be improved. Starting from the dosage ratio ofthe raw materials, the bisphenol compound is excessive, so that the generation of other cyanides in the reaction solution can be avoided, and green production is realized.

Zhou Kaiyun

Papers

Calixarene–based cyanate ester resin for high-temperature material:

Preparation method of fluorine-containing cyanate monomer

Preparation method of latent catalyst andcyanate ester resin prepreg

Cyanogen bromide industrial purification process and equipment

Cyanate ester resin synthesis method