2 results about "Norbornene" patented technology

The invention relates to a catalyst for ternary copolymerization of norbornenes, tetrafluoroethylene and pentenes and a ternary copolymerization method. The catalyst is characterized in that the catalyst is prepared through the following method comprising the steps of: dissolving iron dichloride, a ligand and an alkyl metal compound in a solvent in a dry single-neck glass bottle in an inert gas atmosphere, sealing a bottle mouth through an emulsion pipe, keeping the constant temperature in a water bath at the temperature of 40-50 DEG C for 10-30min, and cooling to obtain an iron complex catalyst. Compared with the prior art, the catalyst provided by the invention is a novel iron complex catalyst which can produce catalytic activity in an nitrogen-protected system at a certain pressure and the temperature of 20-120 DEG C so as to catalyze the ternary copolymerization of the norbornenes with the tetrafluoroethylene and the pentenes, and a product after soaking in methanol is very easy to wash and separate. The catalyst has the characteristics of high copolymer yield, low reaction temperature, low price, easiness in obtainment, high catalytic efficiency and the like.

The invention relates to a cis-5-norbornene-exo-2,3-dicarboxylic anhydride crystal form and a preparation method thereof, and belongs to the technical field of compound crystal forms. The invention provides a cis-5-norbornene-exo-2,3-dicarboxylic anhydride crystal form which has diffraction peaks at 13.082 degrees, 16.141 degrees, 17.533 degrees, 17.809 degrees, 18.084 degrees, 21.210 degrees, 23.521 degrees, 24.295 degrees, 24.519 degrees, 26.003 degrees, 26.934 degrees, 32.279 degrees, 32.619 degrees, 33.224 degrees, 35.690 degrees, 38.384 degrees and 51.593 degrees in a powder XRD ray diffraction pattern. The crystal form is few in impurities, high in purity, good in stability and easy to store and transport for a long time. The invention further provides a preparation method of the cis-5-norbornene-exo-2,3-dicarboxylic anhydride crystal form. The method is simple and easy to operate, equipment is simple, conditions are easy to control, cost is low, and operability is high.