6 results about "Phospholenes" patented technology

This application relates to flame-retardant coatings, and more particularly to an aminated phosphorene-based flame-retardant waterborne polyurethane coating and a preparation method thereof. The aminated phosphorene-based flame-retardant waterborne polyurethane coating is prepared from a diisocyanate-terminated prepolymer, a neutralizer and an aminated phosphorene, where the diisocyanate-terminated prepolymer is prepared from polymeric diol with water-dispersible groups, aliphatic diisocyanate and carboxylic acid type hydrophilic diol under the catalysis of a catalyst for synthesizing waterborne polyurethane.

The application belongs to the technical field of high polymer materials, and particularly relates to a synthesis process of 2,3,6,7-naphthalene tetracarboxylic dianhydride. The steps are as follows: alpha,alpha,alpha',alpha',4,5-hexabromo-o-xylene is reacted with 2-(triphenylphosphoranyl) butanedioic acid dialkyl ester in an organic solvent in the presence of an acid-binding agent to obtain 6,7-dibromo-2,3-naphthalene dicarboxylate; the 6,7-dibromo-2,3-naphthalene dicarboxylate is reacted with a cyanation reagent to obtain 6,7-dicyano-2,3-naphthalene dicarboxylate; the 6,7-dicyano-2,3-naphthalene dicarboxylate is hydrolyzed in an alkaline aqueous solution, and after the reaction is completed, acidification is performed to obtain 2,3,6,7-naphthalene tetracarboxylic acid; and the 2,3,6,7-naphthalene tetracarboxylic acid is dehydrated in an acid anhydride environment to obtain 2,3,6,7-naphthalene tetracarboxylate dianhydride. The application has the advantages that raw and auxiliary materials are easy to obtain and low in cost, is suitable for mass industrial production, the synthesis process avoids harsh environments such as high temperature and high pressure, the conversion rate is high, the product quality is stable, and high-purity products can be obtained.

The present invention relates to a process for preparing a polycarbodiimide composition, the process comprising (i) preparing a mixture comprising 1,3-bis(2-isocyanatopropan-2-yl)benzene (TMXDI) and a catalytic compound, wherein the catalytic compound comprises 1,3-dimethyl-2- phospholene 1-oxide, 1,3-dimethyl-3-phospholene 1-oxide, or 1,3-dimethyl-2-phospholene 1- oxide and 1,3-dimethyl-3-phospholene 1-oxide; (ii) subjecting the mixture obtained from (i) to reaction conditions in a gas atmosphere, wherein the reaction conditions comprise heating the reaction mixture to a temperature in the range of from 80 to 220 °C; to obtain a mixture comprising the polycarbodiimide composition. In addition thereto, the present invention relates to a polycarbodiimide composition obtained or obtainable by said process and use thereof.

The invention belongs to the field of nano composite materials, and discloses a phosphoalkenyl cellulose nanofiber membrane as well as a preparation method and application thereof. The phosphorene-based cellulose nanofiber membrane is prepared by the following steps: firstly, introducing an amino group through urea modified phosphorene; then, an EDC / NHS reagent and the carboxylated cellulose nanofibers are subjected to covalent crosslinking; directionally freezing the mixed solution in a copper-based mold, forming a layered structure by using an ice template method, and freeze-drying to obtain aerogel; and finally, carrying out hot pressing on the aerogel to form a compact layered film. The mass ratio of phosphorene to urea is (1: 10)-(1: 50); the mass ratio of the aminated phosphorene to the carboxylated cellulose nanofiber is (1: 1)-(1: 10). The heat conductivity coefficient of the phosphorene-based cellulose nanofiber membrane prepared by the method in the plane direction reaches 8.21 W / m.K, and the phosphorene-based cellulose nanofiber membrane is suitable for high-power electronic heat dissipation materials.

The invention belongs to the technical field of photocatalysts, and discloses a phosphorene-based composite material, a preparation method thereof and application of the phosphorene-based composite material in medical wastewater treatment, the phosphorene-based composite material comprises a purple phosphorus / black phosphorus heterojunction and noble metal nanoparticles anchored at the edge of the heterojunction; a phase junction electric field is formed at the interface of the purple phosphorus / black phosphorus heterojunction, an edge local electric field is formed between the precious metal nanoparticles and the purple phosphorus / black phosphorus heterojunction, and the phase junction electric field and the edge local electric field jointly form an integrated double-electric-field system. According to the integrated double-electric-field system of the phosphorene-based composite material, directional and rapid transmission of photo-induced electrons from a bulk phase to an edge active center can be realized, the charge separation efficiency is greatly improved, the reverse reaction is effectively inhibited, and meanwhile, the overall quantum efficiency is improved; in medical wastewater treatment, a green reaction path of treating waste with waste is constructed, and thorough mineralization of pollutants and in-situ conversion of carbon resources are realized.

The invention discloses a preparation method of a light-triggered violet phosphorus alkene nanosheet loaded antibacterial peptide cascade sterilization intelligent hydrogel wound dressing. The preparation method comprises the following steps: preparing a polyether F127 diacrylate / methacrylated polylysine (F127DA / PLMA) intelligent hydrogel solution under an ice bath condition; defensin is added into the violaphorene nanosheet solution, full suspension is carried out through ultrasound, centrifugation is carried out, supernate is discarded, and violaphorene nanosheet sediment loaded with the antibacterial peptide is obtained; and taking an F127DA / PLMA intelligent hydrogel solution as a carrier, adding the F127DA / PLMA intelligent hydrogel solution into the precipitate, carrying out sufficient ultrasonic suspension to obtain an antibacterial peptide violet phosphorus alkene nanosheet-F127DA / PLMA hydrogel suspension, and carrying out crosslinking and sterilization to obtain the light-triggered violet phosphorus alkene nanosheet loaded antibacterial peptide cascade sterilization intelligent hydrogel wound dressing. The prepared antibacterial peptide loaded purpurene nano drug-loading system can continuously release antibacterial peptide on a wound surface to play a cascade sterilization role and promote healing of the wound surface with drug-resistant bacteria.