58 results about "Polymer morphology" patented technology

An implantable medical lead for implantation in a patient which has at least one electrical conductor connected to at least one electrode and / or sensor of said lead. The at least one conductor is arranged within a continuous sheet of a polymer material. A distal portion of the lead is adapted to be located in or at a heart of said patient and a proximal portion of said lead is connectable to an implantable medical device and arranged such that, when connected to the device, at least a part of the proximal portion of the sheet is placed in close proximity to said medical device. At least the proximal portion of the polymer sheet material is processed in at least a first heat process stage such that an inherent resistance to wear of the polymer sheet material is substantially maintained, and the distal portion of said polymer sheet material is processed in at least a second heat process stage in which a polymer morphology of said polymer material is altered such that an inherent flexibility of the polymer sheet material is substantially increased.

The invention relates to an alpha-diimine compound, a metal complex and a load containing the compound and application thereof. The structural formula of the compound is shown as a formula I. The alpha-diimine compound is provided with a hydroxyl radical on a substituent group connected to an acenaphthene ring, the compound can react with active radicals on a carrier after chemical modification to form covalent bonds, so that the alpha-diimine compound is loaded on the carrier in a covalent bonding manner; and the metal complex containing the alpha-diimine compound, the load containing the alpha-diimine compound and a load of the metal complex containing the alpha-diimine compound can be further obtained. The metal complex containing the alpha-diimine compound and the load containing the metal complex can be used in polymerization of olefins as main catalysts. The metal complex of the load-type alpha-diimine compound can overcome the disadvantages of kettle adhesion, difficult control for polymer conformation, large using amount of catalyst promoter, poor heat stability and the like, and the covalent bonding load manner avoids the complex from being separated from the carrier .

The two stage production of clear, low-haze, injection stretch blow molded polypropylene container articles is disclosed. In the first processing stage, a preform article is manufactured on an injection molding machine. In a second and subsequent step, which may occur remotely from apparatus used in the first step, the preform article is heated and stretch blown into a container. The process may employ the selection of processing parameters to produce preform articles that facilitate stretch blow molding at relatively high rates of speed, while still maintaining an appropriate polypropylene polymer morphology that results in clear, low haze containers.

The invention discloses an electrochemical biological sensor with a polymer nano array, which comprises the following three parts: a supporting electrode, polymers that are combined on the supporting electrode and a biological sensing element that is connected with the polymers. The electrochemical biological sensor is characterized in that the polymers take the shape of a nano fiber array or a nanotube array with permutation directivity. Compared with the existing electrochemical biological sensing techniques, the electrochemical biological sensor with the polymer nano array is characterized by simple techniques and high testing sensitivity, has enormous application prospect and can produce considerable economic and social benefits.

The invention relates to a loading method of a metallocene catalyst. In different stages of catalyst preparation in a closed reaction system, a certain negative pressure is formed in the system, namely: 1) the relative vacuum degree of the inorganic carrier pretreatment step system is ( -0.1)~(-0.075)MPa; 2) The relative vacuum of the system is (-0.065)~(-0.075)MPa when aluminoxane is added to the inorganic carrier; 3) Aluminoxane and metallocene compounds are added to the inorganic carrier After the system returns to normal pressure, each component can enter the pores of the inorganic carrier uniformly and quickly, the loading effect of the catalyst and the polymerization activity are greatly improved, and the polymer morphology is obviously improved. This method is simple and easy to implement, and can greatly improve the The preparation time of the metallocene catalyst is shortened, and the preparation efficiency of the supported catalyst is improved.

The invention relates to an improved olefin polymerization catalyst and the preparation method as well as the application, which comprises a carrier and organoaluminium compound reducing agent loaded on the carrier and double triphenyl silane chromate active ingredient. The invention is characterized in that the carrier is a compound carrier adopting SiO2 and AlCl3 as materials, and the mass ratio of SiO2 and AlCl3 in the carrier is 1 to 20:1. By adopting the SiO2 / AlCl3 compound carrier prepared through the invention, the efficiency of chromium in the catalyst can be effectively improved, thus the ethylene polymerization activity of the catalyst is enhanced, and the hydrogen sensibility and the copolymerization performance of the catalyst are adjusted; the modality of the obtained polymeric compound is good and the bulk density is high, therefore the prepared polyvinyl resin can be used to produce high performance tubular products and coating materials, and the like.

The two stage production of clear, low-haze, injection stretch blow molded polypropylene container articles is disclosed. In the first processing stage, a preform article is manufactured on an injection molding machine. In a second and subsequent step, which may occur remotely from apparatus used in the first step, the preform article is heated and stretch blown into a container. The process may employ the selection of processing parameters to produce preform articles that facilitate stretch blow molding at relatively high rates of speed, while still maintaining an appropriate polypropylene polymer morphology that results in clear, low haze containers.

This invention relates to a supported nonmetallocene catalyst for olefin polymerization, which is produced by directly reacting a nonmetallocene ligand with a catalytically active metallic compound on a carrier through an in-situ supporting process. The process according to this invention is simple and feasible, and it is easy to adjust the load of the nonmetallocene ligand on the porous carrier. The supported nonmetallocene catalyst according to this invention can be used for olefin homopolymerization / copolymerization, even in combination with a comparatively less amount of the co-catalyst, to achieve a comparatively high polymerization activity. Further, the polymer product obtained therewith boasts desirable polymer morphology and a high bulk density.

The present invention provides a method for supporting a nonmetallocene olefin polymerization catalyst, comprising the following steps: a carrier reacts with a chemical activator to obtain a modified carrier; a magnesium compound is dissolved in a tetrahydrofuran-alcohol mixed solvent to form a solution, then the modified carrier is added to the solution to perform a reaction, then filtered and washed, dried and suction dried to prepare a composite carrier; a nonmetallocene olefin polymerization catalyst is dissolved in a solvent, and then reacts with said composite carrier, then is washed and filtered, dried and suction dried, to prepare a supported nonmetallocene olefin polymerization catalyst. The present invention further relates to a supported nonmetallocene olefin polymerization catalyst as prepared by this method. The present invention further relates to the use of the supported nonmetallocene olefin polymerization catalyst in an olefin polymerization and an olefin copolymerization between two or more different olefins. In one specific embodiment, the present invention relates to the use of the supported nonmetallocene olefin polymerization catalyst in a slurry ethylene polymerization. The present invention provides a new type of catalyst that improves the polymer morphology, increases polymer bulk density and enhances polymerization activity.

The invention relates to an olefin polymerized metallocene catalyst system and a preparation method thereof. The catalyst is mainly prepared from an organic high-molecular polymer carrier, a co-catalyst and a metallocene compound, wherein the carrier is monodisperse porous styrene-divinyl benzene-ethylene glycol dimethacrylate terpolymer; the co-catalyst (based on the molar percentage of aluminum Al) and the metallocene compound (based on the molar percentage of metal atom M in the compound) are in a molar ratio Al:M being 75-300; and based on the molar percentage of aluminum Al, each gram of organic high-molecular polymer carrier contains 1-12mmol of co-catalyst. The preparation method mainly comprises the steps of synthesizing the organic high-molecular polymer carrier, and loading the metallocene catalyst. The preparation method is simple and environment-friendly, the prepared catalyst and polymer have good shape since a novel organic porous carrier is adopted, and the catalyst has relatively high activity.

The invention relates to an ultrasonic / filler combined sludge decrement device and process. The sludge decrement device comprises a main flow biological treatment component and a side flow sludge decrement component, wherein the main flow biological treatment component comprises an anoxic tank, an aeration tank and a sedimentation tank which are sequentially connected in the flowing direction of sludge, and the bottom of the sedimentation tank is connected back to the anoxic tank through a pipeline; and the side flow sludge decrement component comprises an ultrasonic unit and a biological decrement unit which are sequentially connected in the flowing direction of sludge, the inlet of the ultrasonic unit is connected to the pipeline at the bottom of the sedimentation tank, and the outlet of the biological decrement unit is connected back to the anoxic tank. Compared with the prior art, the ultrasonic pretreatment provided by the invention can change the morphology and composition of sludge extracellular polymers and reduce the particle size of sludge flocculating constituents, thereby contributing to accelerating the sludge hydrolysis and lysis process; and suspended fillers are thrown into the side flow sludge decrement component, so that habitats are provided for decrement functional microbes, and the hydraulic retention time is prolonged, thereby improving the sludge decrement efficiency.

The invention relates to a metallocene catalyst system for olefin polymerization and a preparation method thereof. The catalyst is mainly prepared from an organic high-molecular polymer carrier, a co-catalyst and a metallocene compound, wherein the carrier is styrene-divinyl benzene-hydroxyethyl methylacrylate terpolymer; a molar ratio of aluminum Al in the co-catalyst to metal atom M in the metallocene compound is 50-300; and based on the molar percentage of aluminum Al, each gram of organic high-molecular polymer carrier contains 1-12mmol of co-catalyst. The preparation method mainly comprises the steps of synthesizing the organic high-molecular polymer carrier, and loading the metallocene catalyst. The preparation method is simple and environment-friendly, the prepared catalyst and polymer have good shape since a novel organic porous carrier is adopted, and the catalyst has relatively high activity.

The invention provides a preparation method of low-crystallinity high trans-1,4-polyisoprene. The method comprises the following steps: sequentially mixing isoprene, a cocatalyst, a main catalyst and a comonomer; and respectively carrying out pre-polymerization reaction and polymerization reaction, so as to obtain the low-crystallinity high trans-1,4-polyisoprene, wherein the main catalyst contains a spherical support and an active component and a phosphate compound; the active component and the phosphate compound are loaded on the spherical support; the spherical support is a magnesium chloride alcohol compound or a spherical silicon dioxide; the comonomer is butadiene, pentadiene or 2,3-dimethyl-1,3-butadiene; and the molar ratio of the comonomer to the isoprene in the polymerization reaction is 2%-30%. The invention provides a method for preparing low-crystallinity high trans-1,4-polyisoprene. The problems of polymer morphology control, polymer liquidity and the like in a bulk precipitation polymerization process are effectively solved.