665 results about "Differential scanning calorimetry" patented technology

Provided is a poly(3-hydroxybutyrate) resin tube including a poly(3-hydroxybutyrate) resin, the tube having a wall thickness of 0.1 to 0.6 mm. The difference between the melting point peak temperature and the melting point peak end temperature in differential scanning calorimetry analysis of the poly(3-hydroxybutyrate) resin is preferably 10° C. or higher. Preferably, production of the tube includes the step of melting a poly(3-hydroxybutyrate) resin in an extruder, then extruding the resin from an annular die, and introducing the resin into water, the annular die temperature being set to a temperature between the melting point peak temperature and the melting point peak end temperature in differential scanning calorimetry analysis of the poly(3-hydroxybutyrate) resin.

The present invention relates to a separator including a coating layer and a substrate, wherein phase-change peak temperatures measured by differential scanning calorimetry (DSC) at the time of a first temperature increase and at the time of a second temperature increase satisfy specific ranges, a method of producing the same, and an electrochemical device including the same. More particularly, the present invention relates to a separator that has improved thermal resistance and thus may improve battery safety and implement stable movement of lithium ions and a lithium secondary battery including the same.

A glass fiber-reinforced thermoplastic polymer composition has a sheathed continuous multifilament strand including a core that extends in the longitudinal direction and a polymer sheath which intimately surrounds the core, wherein the core has an impregnated continuous multifilament strand having at least one continuous glass multifilament strand, wherein the at least one continuous glass multifilament strand is impregnated with an impregnating agent, the polymer sheath is a thermoplastic polymer composition including a thermoplastic polymer, wherein the thermoplastic polymer contains a polyester having a weight average molecular weight of 15,000 to 80,000 Daltons as measured by gel permeation chromatography (GPC) using polystyrene standard and as measured by differential scanning calorimetry with a heating rate of 20° C. / minute on first heating according to ASTM D3418-08, at least one crystalline melting point (Tm) of 200 to 290° C.

The compound contains an epoxy resin (A), magnetic particles (C), and a curing agent (D). In differential scanning calorimetry of the compound, (X) and (Y) satisfy formula (1) and formula (2), where (X) is a heating vertex temperature of a heat quantity curve at a temperature increase rate of 2°C / min of the compound, and (Y) is a heating vertex temperature of a heat quantity curve at a temperature increase rate of 2°C / min after the compound is pressurized at 200 MPa for 5 minutes. 100 ≤ (X) ≤ 200 … (1) (X) - (Y) ≥ 3 … (2)

A quantum dot composite configured to emit green light or red light. The quantum dot composite including a polymer matrix, and a plurality of quantum dots dispersed in the polymer matrix, the plurality of quantum dots include a semiconductor nanocrystal core comprising indium and phosphorus. As determined by differential scanning calorimetry, the quantum dot composite exhibits an intensity of a peak between about 350° C. to about 450° C. that is about 8 times or more and about 13 times or less relative to an intensity of a peak between about 200° C. and about 300° C. in a thermogravimetric analysis graph.

The invention discloses a method for comprehensively evaluating the curing degree of a thermosetting composite material based on a differential scanning calorimetry, which comprises the following steps of: carrying out layered sampling according to the layering design of a to-be-detected thermosetting composite material workpiece, and taking a prepreg of the to-be-detected thermosetting composite material workpiece as a reference substance; all samples are crushed and fully mixed for differential scanning calorimetry, and the curing degree of the to-be-detected thermosetting composite material part is comprehensively evaluated. According to the method, the problem of sample heterogeneity existing in detection of the curing degree of the thermosetting composite material by a differential scanning calorimetry method is solved, and a rapid and accurate detection method is provided for detection of the curing degree of the thermosetting composite material. Meanwhile, layered sampling is carried out on the formed thermosetting composite material, the temperature program of the prepreg takes-50 DEG C as the initial temperature, the heat flow difference between the thermosetting composite material and the reference substance is fully measured, the detection accuracy is ensured, and the method has good application value and prospects.

Thermoplastic compositions include: from about 35 wt% to about 70 wt% of a polymer resin, wherein the polymer resin comprises at least two polymer resins, wherein at least one of the polymer resins includes a high density polyethylene (HDPE) polymer having a degree of crystallinity of at least 47% as measured by differential scanning calorimetry (DSC); from about 10 wt% to about 40 wt% synthetic graphite; from about 5 wt% to about 15 wt% carbon nanotubes (CNTs); and from about 3 wt% to about 15 wt% conductive carbon black powder.

The present invention discloses a positive electrode plate and a lithium ion battery containing the same, belonging to the field of electrochemical technology. The positive electrode plate of the present invention comprises a positive electrode current collector and a positive electrode active material layer arranged on the surface of the positive electrode current collector, wherein the positive electrode active material layer comprises a positive electrode active material, wherein the positive electrode active material comprises a ternary positive electrode material; the positive electrode plate satisfies the following relationship: -6.0≤27.5×V×10 3 ‑(H×△D 3,2 ) 0.5 / 10≤7.5; wherein V is the micropore volume of the positive electrode active material; H is the exothermic enthalpy value in the range of 80 to 250°C in the differential scanning calorimetry analysis of the positive electrode active material in the 75% delithiation state; △D 3,2 It is the D(3,2) particle size change rate of the positive electrode active material before and after holding the pressure at 35KN for 30s. The lithium ion battery containing the positive electrode sheet of the present invention has a higher energy density while maintaining good high temperature safety.

The invention relates to a crystal form I, a crystal form II, a crystal form III, a crystal form IV and a crystal form V of (S)-indobufen sodium salt as well as a preparation method and application of the crystal form I. The five crystal forms of the (S)-indobufen sodium salt are comprehensively characterized by X-ray diffraction, differential scanning calorimetry and thermogravimetric analysis. The (S)-indobufen sodium salt crystal form provided by the invention is stable in quality and easy to store, and can be used for preparation production. The preparation method is simple to operate, safe, environment-friendly, low in cost and suitable for industrial production.

A semicrystalline poly ketone powder useful for additive manufacturing may be made by dissolving a polyketone having differential scanning calorimetry (DSC) monomodal melt peak, at a temperature above 50° C. to below the melt temperature of the polyketone, precipitating the dissolved polyketone by cooling, addition of a nonsolvent or combination thereof. The method may be used to form polyketones having a DSC melt peak with an enthalpy greater than the starting polyketone.

The invention provides a quantitative NMR (nuclear magnetic resonance) carbon spectrum valuing method of an azide polyether branching degree standard substance, which is based on quantitative NMR and directly values the branching degree of the azide polyether branching degree standard substance under the condition of not using an internal standard substance. Compared with the existing branching degree valuing method, such as a differential scanning calorimetry and a gel chromatography, the valuing method disclosed by the invention does not need an internal standard or an external standard, does not need to establish a calibration measurement curve, is simple and convenient in data processing and calculation, high in detection sensitivity and good in valuing accuracy, can realize unattended operation and stable operation in the testing process, and is suitable for large-scale popularization and application. The method is suitable for valuing the azide polyether branching degree standard substance.

The present application provides a battery, an energy storage device, an electrical system and an energy storage system. The battery of the present application includes a negative electrode sheet and an electrolyte. The negative electrode sheet includes a negative electrode material. When a state of charge of the battery ranges from 95% to 105%, a differential scanning calorimetry curve of a mixture of the negative electrode material and the electrolyte has a first exothermic peak, a second exothermic peak and a third exothermic peak. A peak temperature of the first exothermic peak is T1, a peak temperature of the second exothermic peak is T2, and a peak temperature of the third exothermic peak is T3. The battery satisfies a relationship: 2≤(T2−T1) / (T3−T2)≤4.5. The battery of the embodiments of the present application has good heat resistance and overcharge resistance.

The present invention relates to a tread of a tyre having a tread pattern with a longtotal index (As) equal to or less than 17; said tread being characterized in that it is made up of a rubber composition comprising: (a) a crosslinkable unsaturated chain polymer base comprising from 10 to 50 phr of a modified styrene-butadiene copolymer rubber having a glass-transition temperature (Tg), measured by differential scanning calorimetry, of −50° C. or less; (b) a filler comprising 40 to 100 phr of silica; (c) a plasticizer system comprising a hydrocarbon resin and from 8 to 25 phr of octyloleate; and (d) a vulcanization system; said hydrocarbon resin having a softening point of 110° C. or higher, and an average molecular weight comprised between 700 and 1500 g / mol.

The invention provides a secondary battery and an electronic device, the secondary battery comprises a positive pole piece, a negative pole piece and a diaphragm, a positive pole material layer comprises a first oligomer, a negative pole material layer comprises a second oligomer, and the diaphragm comprises a third oligomer, the first oligomer, the second oligomer and the third oligomer have the same repeating unit, and the thermal decomposition temperatures of the first oligomer, the second oligomer and the third oligomer are respectively and independently between 90 DEG C and 180 DEG C; in a differential scanning calorimetry test spectrogram of the positive electrode material layer, a first thermal decomposition peak exists between 90 DEG C and 180 DEG C, and the temperature of the first thermal decomposition peak is TC; in a differential scanning calorimetry test spectrogram of the negative electrode material layer, a second thermal decomposition peak exists between 90 DEG C and 180 DEG C, and the temperature of the second thermal decomposition peak is TA; in a differential scanning calorimetry test spectrogram of the diaphragm, a third thermal decomposition peak exists between 90 DEG C and 180 DEG C, and the temperature of the third thermal decomposition peak is TS; 0 DEG C < = Max( TC, TA, TS)-Min (TC, TA, TS) < = 20 DEG C, and the interface problem and the cycle performance of the secondary battery in the charge-discharge cycle process can be improved.

Embodiments are directed to a polyolefin elastomer comprising a polymerized reaction product of 50 mol% to 99.5 mol% ethylene and 0.5 mol% to 40 mol% cyclic olefin. The polyolefin elastomer comprises a glass transition temperature of -30 °C to 30 °C, as measured according to Differential Scanning Calorimetry and a weight average molecular weight of 50,000 g / mol to 500,000 g / mol, as measured according to conventional Gel Permeation Chromatography. Further embodiments are directed to laminates comprising the polyolefin elastomer.

The application provides a MEMS differential thermal analysis sensor and a DTA / DSC testing method, the sensor comprising a detection thermocouple, a reference thermocouple, an ambient resistance and a shielding ring, wherein the detection thermocouple and the reference thermocouple each comprise a single crystal silicon substrate, a heat insulation cavity, a plurality of single crystal silicon thermocouple pairs and a supporting film, the heat insulation cavity is located in the single crystal silicon substrate, the plurality of single crystal silicon thermocouple pairs are connected in series and are supported by the supporting film to be suspended above the heat insulation cavity to achieve thermal isolation, and the single crystal silicon thermocouple pair comprises an N-type single crystal silicon thermocouple and a P-type single crystal silicon thermocouple connected in series, the temperature and power sensitivity of the sensor are significantly improved, reach 28 mV / K and 100 V / W, and the noise equivalent temperature difference and the noise equivalent power reach 0.5 mK or 0.2 muW. Based on the output signal of the sensor, differential thermal analysis testing and differential scanning calorimetry testing on physical or chemical processes of material heat absorption and release can be realized, the sample consumption is small, and the testing precision is high.

To provide: a resin composition having extremely high mechanical characteristic; and a method for manufacturing the resin composition.SOLUTION: One embodiment provides: a resin composition including a cellulose nanofiber, a thermoplastic resin, and a polyphenylene ether whose glass transition temperature by differential scanning calorimetry (DSC) is -100°C to 50°C, as well as a molded product, a molding material for 3D printing, and a formed object. In one embodiment, the polyphenylene ether has a saturated or unsaturated hydrocarbon group which may be substituted and has a carbon number of 7-25.SELECTED DRAWING: None

The utility model relates to the technical field of testing, in particular to a differential scanning calorimeter which comprises a differential scanning calorimeter, a heating assembly, a display screen and ground feet, the display screen is arranged on one side of the front face of the differential scanning calorimeter, and the ground feet are connected to the positions, close to the four corners, of the lower end of the differential scanning calorimeter. One side, far away from the display screen, of the upper end of the differential scanning calorimeter is connected with a heating assembly, and the heating assembly is composed of a heat insulation cover, a heat insulation sleeve, a handle, a first inner cover, a second inner cover, an inner furnace, an outer furnace, a heat insulation tank, a sealing ring, a heating ring, a sample holder, a soaking block, a sample box and a temperature difference sensor.

The invention belongs to the technical field of alkali metal atom gas chambers, and particularly relates to a method for precisely filling mixed alkali metal atoms in an atom gas chamber, which comprises a theoretical method for precisely filling and quantitatively detecting the mixed alkali metal atoms, a technical method for precisely acquiring the mixed alkali metal atoms and a precise filling technology based on a temperature gradient method. The method is combined with an in-situ quantitative detection technology based on a differential scanning calorimetry, so that high-precision regulation and control and real-time verification of the content of the mixed alkali metal atoms in the gas chamber can be realized. The method is simple and convenient in process and high in filling efficiency, ensures accurate control of the atomic weight of the alkali metal in the air chamber, effectively improves the performance of the air chamber, and further optimizes the overall performance and the measurement precision of the SERF atom gyroscope.

To provide a silicone rubber composition capable of forming a silicone heat-shrinkable tube showing excellent shrinkability even under low-temperature heating and having conventional shape retention during storage at room temperature.SOLUTION: A silicone rubber composition for forming a silicone heat-shrinkable tube, comprises: (A) 100 pts.mass of a linear organopolysiloxane having two or more vinyl groups bonded to silicon atoms per molecule, an average degree of polymerization of 3,000 to 50,000, at least 50 mol.% of all substituents being methyl groups, and 0.05 to 5.0 mol.% being vinyl groups; (B) 10 to 100 pts.mass of an organopolysiloxane resin different from the component (A) having a softening point of 100 to 200°C, and an endothermic peak of 50°C to 80°C in differential scanning calorimetry; (C) 5 to 50 pts.mass of powdered silica having a BET specific surface area of 100 m2 / g or more; and (D) an effective amount of a curing agent.SELECTED DRAWING: Figure 1

The invention discloses a method for preparing biphenol type high-heat-resistance liquid crystal polyester through melt coupling solid-phase polycondensation, which comprises the following steps: synthesizing a liquid crystal polyester prepolymer with specific logarithmic viscosity and melting point from p-acetoxybenzoic acid monomer, 4, 4-diacetoxybiphenyl and terephthalic acid according to different molar ratios; placing the crushed and dried prepolymer particles in a solid phase polycondensation device, accurately controlling the time, temperature and nitrogen flow rate of the polycondensation reaction to obtain the biphenol type high-heat-resistance liquid crystal polyester, and taking out the biphenol type high-heat-resistance liquid crystal polyester for DSC (differential scanning calorimetry) test. In the preparation process of the prepolymer, the molar percentage of the biphenol monomer is effectively regulated and controlled to prepare the prepolymer with proper logarithmic viscosity and high melting point, and the influence of different monomer proportions on the melting point of the polymer is researched; the solid-phase polycondensation time required for obtaining the biphenol type high-heat-resistance polymer is shortened by crushing the prepolymer into particles with different diameters, so that the solid-phase polycondensation efficiency is improved.

A stretched polyethylene film for lamination, which comprises a polyethylene (A) having a weight average molecular weight (Mw) as measured by gel permeation chromatography of from 70,000 to 250,000, a proportion of fractions with a molecular weight of 10,000 or less of 8 wt % or less, and a density as measured in accordance with JIS K6922-1 (1997) of from 945 to 980 kg / m3, and has at least one peak in a range of 135° C. or higher in an endothermic curve as measured by differential scanning calorimetry, the film having high recyclability and excellent in heat resistance.

The invention provides a novel sarpogrelate hydrochloride crystal form and a preparation method and application thereof, an X-ray powder diffraction pattern of a crystal with the novel crystal form has characteristic peaks at 2theta values of 10.88 + / -0.1 degrees, 16.64 + / -0.1 degrees and 18.83 + / -0.1 degrees, and a differential scanning calorimetry analysis pattern of the crystal has an endothermic peak at 153-156 DEG C. The crystal has excellent stability, solubility and hygroscopicity as well as relatively high bioavailability and purity, and meanwhile, the preparation method is simple, the crystallization condition is mild, the cost is low, and the crystal is suitable for industrial production and can be used for preparing related pharmaceutical preparations.

The invention relates to the technical field of keel quality identification, in particular to a keel identification method based on differential scanning calorimetry, which comprises the following steps: S1, preparing a keel sample into keel sample powder, putting the keel sample powder into a container, putting the container into a sample measuring pool of a differential scanning calorimeter, and testing under preset conditions; and S2, acquiring a differential scanning calorimetry curve of the keel sample, when the differential scanning calorimetry curve has an endothermic peak within the temperature range of 110-140 DEG C, judging the keel sample as a certified product or a counterfeit product containing at least part of the certified product, and when the differential scanning calorimetry curve does not have an endothermic peak within the temperature range of 110-140 DEG C, judging the keel sample as a counterfeit product. Quality identification of authenticity and adulteration conditions in the keel sample is realized according to whether an endothermic peak appears in a differential scanning calorimetry curve of the keel sample in a temperature range of 110-140 DEG C and according to the peak value of the endothermic peak.

A water dispersible repellent containing a modified form of a polyol and a dispersant, the repellent satisfying one or more of (1) and (2), and being capable of imparting oil resistance to a base material (for example, fiber or paper). (1) Differential scanning calorimetry of the modified form of a polyol or differential scanning calorimetry of a solid component obtained by removing the liquid medium from the repellent shows the temperature of the maximum endothermic peak in the temperature zone of 25°C-180° C is 55°C or more. (2) The modified form of a polyol has at least four monovalent C20-40 hydrocarbon groups which may have substituents.

There is provided a method of annealing granules of a polyaryletherketone, PAEK, polymer to obtain annealed granules suitable for use in an additive manufacturing process. The method comprises: a) obtaining precursor granules of the PAEK polymer, wherein the precursor granules have a crystallinity of between about 0% and 20%, as measured by differential scanning calorimetry, DSC; and b) heating the precursor granules to an annealing temperature to thereby obtain annealed granules, wherein the annealing temperature is at least a glass transition temperature, Tg, of the PAEK polymer and at most about 50°C less than a melting temperature, Tm, of the PAEK polymer. following annealing in b), the annealed granules have a crystallinity of between about 15% and 35%, as measured by DSC, and wherein the annealing in b) increases the crystallinity of the precursor granules by at least 2%.

To provide a warpage analysis method, a warpage analysis device, and a warpage analysis program of a resin molding, and a recording medium, which improve prediction accuracy by fully considering a crystallinity behavior of a resin in a molding process.SOLUTION: A warpage analysis method of a resin molding includes a crystallinity calculation step of calculating the temporal change of the crystallinity of the resin, on the basis of temporal changes of a temperature and a pressure in a resin solidification shrinkage process, and a specific volume calculation step of calculating the temporal change of the specific volume of the resin, on the basis of the temporal change of the temperature, the temporal change of the pressure and the temporal change of the crystallinity, where the crystallinity calculation step calculates the temporal change of the crystallinity by considering the crystallinity behavior of the resin in a molding temperature region obtained by high speed differential scanning calorimetry, and the specific volume calculation step calculates the temporal change of the specific volume, on the basis of a predetermined expression.SELECTED DRAWING: Figure 3

A system for the simultaneous thermal analysis of a plurality of single samples of, in particular biological, material by means of differential scanning calorimetry, with at least one sample carrier having several sample vessels, wherein a single sensor for measuring an amount of heat emitted or absorbed by the single sample during the thermal analysis is assigned to each sample vessel; a heating and / or cooling unit for the simultaneous temperature application of the single samples included in the sample vessels, with a receptacle for the at least one sample carrier; a measuring instrument, which is connected to the single sensors and which is formed to simultaneously capture a measuring value for the emitted or absorbed amount of heat of the single samples during the thermal analysis, a sample carrier, in particular for use in this system as well as a method for the simultaneous analysis of a plurality of single samples or groups of single samples by means of differential scanning calorimetry.

A purpose of the present invention is to provide a biaxially stretched polyester film for laminating to a metal sheet, which can be prevented or inhibited from peeling from the metal sheet during forming and which can prevent or inhibit the metal sheet from suffering corrosion that can be caused by retorting. Another purpose is to provide a laminate and a container. The biaxially stretched polyester film for laminating to a metal sheet comprises an A layer including poly(ethylene terephthalate) and a B layer including a polyester which is substantially amorphous. T1 (i.e., the melting point of the polyester which is substantially amorphous) is 180-215°C. The difference between T1 and T2 (i.e., the melting sub-peak temperature of a differential scanning calorimetry curve of the biaxially stretched polyester film for laminating to a metal sheet) is 15-40°C. The laminate comprises a metal sheet and the biaxially stretched polyester film for laminating to a metal sheet. The container includes the laminate.

The present invention relates to a cross-linkable rubber composition, a cross-linked rubber composition obtained by cross-linking such a rubber composition, a method of preparing a tyre and a tyre. The cross-linkable rubber composition comprises, per hundred parts by weight of rubber (phr): 100 phr of a blend of a natural rubber (NR), a polybutadiene rubber (BR), and first and second solution polymerized styrene-butadiene rubbers (SSBR), a silica filler, and a resin, wherein the rubber composition comprises: ≥ 5 phr to ≤ 30 phr of NR; ≥ 20 phr to ≤ 80 phr of BR; ≥ 5 phr to ≤ 40 phr of the first SSBR having a glass transition temperature Tg, determined by differential scanning calorimetry (DSC) according to ISO 22768, in a range of ≥ −30°C to ≤ 0°C; ≥ 10 phr to ≤ 50 phr of the second SSBR having a glass transition temperature Tg, determined by differential scanning calorimetry (DSC) according to ISO 22768, in a range of ≥ −120°C to ≤ −40°C; ≥ 5 phr to ≤ 25 phr of a first silica filler having a BET surface area in a range of ≥ 190 m2 / g to ≤ 320 m2 / g, determined according to ASTM D1993, and ≥ 75 phr to ≤ 200 phr of a second silica filler having a BET surface area in a range of ≥ 70 m2 / g to ≤ 100 m2 / g, determined according to ASTM D1993.