48 results about "Molar mass distribution" patented technology

Methods, systems and devices are described for rapid characterization and screening of liquid samples to determine properties (e.g., particle size, particle size distribution, molar mass and / or molar mass distribution) thereof with static light scattering and / or dynamic light scattering. The liquid samples can be solutions, emulsions, suspensions or dispersions. One method, includes providing a vessel containing a liquid sample having an exposed surface that defines a gas-liquid sample interface, and analyzing the sample by light scattering methods that include transmitting light through the gas-liquid sample interface into the sample, and detecting light scattered from the sample or from a component thereof. Additional methods are directed to characterizing a plurality of liquid samples or components thereof. The methods, systems, and devices have applications in high-throughput screening, and particularly, in combinatorial materials research and in industrial process control.

A blown film having a thickness from 8 to 200 μm and dart drop impact DDI of more than 400 g, comprising a polyethylene molding composition having a multimodal molar mass distribution; a density from 0.940 to 0.948 g / cm3; an MFR190 / 5, from 0.10 to 0.50 dg / min; comprising:40 to 60% of an ethylene homopolymer A having a molecular weight;25 to 45% of a copolymer B of ethylene and at least one comonomer selected from the group of olefins having from 4 to 8 carbon atoms, said copolymer B having a molecular weight higher than said molecular weight of homopolymer A; and10 to 30% of a copolymer C of ethylene and at least one comonomer, said copolymer C having a molecular weight higher than said molecular weight of copolymer B,all percentages being based on the total weight of the molding composition.

The invention relates to a polyethylene molding composition having a multimodal molar mass distribution particularly suitable for blow molding films having a thickness in the range from 8 to 200 μm. The molding composition has a density at a temperature of 23° C. in the range from 0.948 to 0.953 g / cm3 and an MFR190 / 5 of the final product after extrusion in the range from 0.10 to 0.50 dg / min. The composition comprises from 30 to 60% by weight of a first ethylene polymer fraction made of a homopolymer A having a first molecular weight, from 22 to 40% by weight of a second ethylene polymer fraction made of a further homopolymer or first copolymer B of ethylene and at least one first comonomer from the group of olefins having from 4 to 8 carbon atoms, the first copolymer B having a second molecular weight higher than the first molecular weight, and from 10 to 30% by weight of a third ethylene polymer fraction made of a second copolymer C having a third molecular weight higher than the second molecular weight. The molding composition of the invention allows to produce films having a good balance between processability and mechanical properties.

The invention belongs to the technical field of nonmetallic composite material machining and forming and mainly relates to a wind-power blade preparation method capable of controlling mass distribution. The wind-power blade preparation method capable of controlling the mass distribution comprises the steps of preparation of a blade upper shell, preparation of a blade lower shell, preparation of a front edge web, preparation of a rear edge web, preparation of a girder and blade die assembly and adhesion forming. Control over the weight and mass distribution is conducted in the processes of the preparation of the blade upper shell, preparation of the blade lower shell, preparation of the front edge web, preparation of the rear edge web, preparation of the girder and blade die assembly and adhesion, and thus control over the mass distribution of the wind-power blade is achieved. The final mass distribution of the blade can be controlled within a certain range, later-stage single-point balance weight of the blade is avoided or reduced, and the quality and security risks of the single-point balance weight are reduced.

To provide a method that reduces an influence of dependence of an ionizing beam in an incident direction or uneven irradiation to a sample on a result of mass spectrometry, and can measure mass distribution with high reliability. A mass distribution measuring method according to the present invention includes: changing a direction of irradiating the ionizing beam to a sample surface; acquiring a plurality of mass distribution images in a plurality of incident directions; performing image transform of the mass distribution images according to an angle formed by an incident direction of the ionizing beam and a substrate surface; synthesizing the plurality of transformed images; and outputting the synthesized mass distribution images.

A semiconductor wafer fabrication metrology method in which process steps are characterized by a change in wafer mass, whereby during fabrication mass is used as a measurable parameter to implement statistical process control on the one or more of process steps. In one aspect, the shape of a measured mass distribution is compared with the shape of a predetermined characteristic mass distribution to monitor the process. An determined empirical relationship between a control variable of the process and the characteristic mass change may enable differences between the measured mass distribution and characteristic mass distribution to provide information about the control variable. In another aspect, the relative position of an individual measured wafer mass change in a current distribution provides information about individual wafer problems independently from general process problems.

The invention provides an MEMS sensor-based fan blade vibration detection and control device, and consists of an MEMS sensor (1), a controller (2), a stepping motor (3), mass blocks (4), a slide rail (5) and a lead screw (6). The device changes the frequency of fan blades by controlling mass distribution of the mass blocks in the fan blades, thereby enabling the fan blades to be balanced, and achieving an effect of alleviating vibration. By adoption of a fan blade vibration active control system, blade vibration is effectively avoided, and preventing a fan failure from being caused.

The invention relates to a polyethylene and catalyst composition for its preparation. Polyethylene which comprises ethylene homopolymers and / or copolymers of ethylene with 1- alkenes and has a molar mass distribution width MW / Mn of from 3 to 30, a density of from 0.945 to 0.965 g / cm3, a weight average molar mass Mw of from 50 000 g / mol to 200 000 g / mol, a HLMI of from 10 to 300 g / 10 min and has from 0.1 to 15 branches / 1000 carbon atoms, wherein the 1 to 15 % by weight of the polyethylene having the highest molar masses have a degree of branching of more than 1 branch of side chains larger than CH3 / 1000 carbon atoms, a process for its preparation, catalysts suitable for its preparation and also injection moldings in which this polyethylene is present.

Pressure-sensitive adhesives containing at least one functionalized polymer or block polymer having a weight average of the molar mass distribution of between 5,000 g / mol and 200,000 g / mol and a difference between Mp and Mmin which is lower than 25,000 g / mol, where Mp represents the peak molar mass of a monomodal polymer or the peak molar mass of the smallest mode in a bimodal or multimodal polymer and Mmin represents the lowest molar mass in the molar mass distribution, defined at each point where the cumulative frequency of the molar mass distribution has a value of 0.05, the functionalized polymer or block polymer carries at least one type of functionalization that can be used for a subsequent cross-linking and the at least one type of functionalization of the functionalized polymer results from the use of at least one type of functionalized monomer during the production of the functionalized polymer.

The invention relates to a polymeric molding compound made from a first ethylene polymer (A) and from a second ethylene polymer (B) which is particularly suitable for producing thick-walled large-caliber pipes, wherein the molding compound comprises an amount in the range from 55 to 75% by weight of the first ethylene polymer (A) and an amount in the range from 25 to 45% by weight of the second ethylene polymer (B), based in each case on the total weight of the molding compound, where the first ethylene polymer (A) is a copolymer of ethylene with a 1-olefin having a total number of carbon atoms in the range from 4 to 10 as comonomer, and with a proportion of from 0.2 to 5% by weight of comonomer, based on the weight of the first ethylene polymer (A), and with a wide bimodal molar mass distribution, and where the second ethylene polymer (B) is a copolymer made from ethylene units and from a 1-olefin having a number of carbon atoms in the range from 4 to 10, which has a bimodal molar mass distribution differing from that of the first ethylene polymer (A). The invention further relates to a high-strength pipe made from this molding compound, and to its use for the transport of gas or water.

To provide a method that reduces an influence of dependence of an ionizing beam in an incident direction or uneven irradiation to a sample on a result of mass spectrometry, and can measure mass distribution with high reliability. A mass distribution measuring method according to the present invention includes: changing a direction of irradiating the ionizing beam to a sample surface; acquiring a plurality of mass distribution images in a plurality of incident directions; performing image transform of the mass distribution images according to an angle formed by an incident direction of the ionizing beam and a substrate surface; synthesizing the plurality of transformed images; and outputting the synthesized mass distribution images.

The present invention provides a facile method for separation (fractionation) of HA in a sample over a broad M range, including low M HA, by ion exchange (IEX) chromatography. The present invention also provides an assay method for quantifying in a sample the presence of low M HA in total HA isolated from a biological source. The method involves HA fractionation according to M by use of IEX separation, followed by HA-specific assay of HA size range fractions.

The invention relates to a polyethylene molding composition having a multimodal molar mass distribution particularly suitable for blow molding films having a thickness in the range from 8 to 200 μm. The molding composition has a density at a temperature of 23° C. in the range from 0.953 to 0.960 g / cm3 and an MFR190 / 5 of the final product after extrusion in the range from 0.10 to 0.50 dg / min. The composition comprises from 30 to 60% by weight of a first ethylene polymer fraction made of a homopolymer A having a first molecular weight, from 22 to 40% by weight of a second ethylene polymer fraction made of a further homopolymer or first copolymer B of ethylene and at least one first comonomer from the group of olefins having from 4 to 8 carbon atoms, the first copolymer B having a second molecular weight higher than the first molecular weight, and from 10 to 30% by weight of a third ethylene polymer fraction made of a second copolymer C having a third molecular weight higher than the second molecular weight. The molding composition of the invention allows to produce thin films having improved processability without impairing the mechanical properties.

A novel scanning method of a mass spectrometer apparatus is introduced so as to relate by simple time shifts, rather than time dilations, the component signal (“peak”) from each ion even to an arbitrary reference signal produced by a desired homogeneous population of ions. Such a method and system, as introduced herein, is enabled in a novel fashion by scanning exponentially the RF and DC voltages on a quadrupole mass filter versus time while maintaining the RF and DC in constant proportion to each other. In such a novel mode of operation, ion intensity as a function of time is the convolution of a fixed peak shape response with the underlying (unknown) distribution of discrete mass-to-charge ratios (mass spectrum). As a result, the mass distribution can be reconstructed by deconvolution, producing a mass spectrum with enhanced sensitivity and mass resolving power.

Method for producing polyacrylate adhesive compounds with a narrow molar mass distribution by radical polymerization and subsequent decolorization of colored reaction products resulting therefrom.

A hyperbranched polyaryletherketone, a preparation method for same, and an application thereof. The hyperbranched polyaryletherketone comprises a compound as represented by formula (I) and having a number average molecular mass between 27,500 and 45,000 and a molar mass distribution between 1.45 and 1.84, where R is either -OH or formula (II). The hyperbranched polyaryletherketone can be used in preparing a liquid crystal alignment film. The hyperbranched polyaryletherketone has a structure of increased similarity to liquid crystal molecules and provides an enhanced force between the liquid crystal molecules and the liquid crystal alignment film.