151 results about "Thermogravimetry" patented technology

The invention discloses a method for preparing surface carboxylic group functional polystyrene / nano-silicon dioxide hybrid material by effectively combining click chemistry and ATRP; in the method, a silane coupling agent is adopted for linking an ATRP evocating agent to a SiO2 particle surface, and polystyrene (PSt) is grafted on the SiO2 particle surface by adopting the ATRP; then, carboxyl is led into a nano-silicon dioxide particle surface modified by the polystyrene by means of the click reaction, thus obtaining the surface carboxylic group functional polystyrene / nano-silicon dioxide hybrid material. After the infrared, nuclear magnetism and thermogravimetry mapping analysis, the surface carboxylic group functional polystyrene / nano-silicon dioxide hybrid material prepared by the invention has good thermal stability and dispersivity; in addition, as the carboxyl has wide reaction range and the characteristic of easy ionization, nano-particles has high reactive behavior so as to be widely applied to the fields such as high polymer material modifying agents, water treatment agents, catalysts, sensing agents and protein carriers.

An aggregate of carbon nanotubes satisfying all of the following requirements (1) to (3):(1) the volume resistivity is from 1×10−5 Ω·cm to 5×10−3 Ω·cm;(2) at least 50 out of 100 carbon nanotubes are double-walled carbon nanotubes in observation by a transmission electron microscope; and(3) the weight loss from 200° C. to 400° C. in thermogravimetry at a temperature rise of 10° C / min is from 5% to 20%.

The invention discloses a method for evaluating the flame retardant efficiency of asphalt, belonging to the technical field of an asphalt pavement and solving the problem that a method for evaluating the flame retardant efficiency of the asphalt is difficultly accurately quantified by using an existing flame retardant. According to the method, based on the combination of a thermogravimetry-differential thermal analysis synchronous test and a thermal analysis kinetics theoretical equation, the flame retardant efficiency of a flame retardant to the asphalt is quantificationally evaluated. The method comprises the steps of: respectively testing the asphalt and prepared flame-retardant asphalt by adopting a thermogravimetry-differential thermal analyzer to obtain test data such as TGs (Thermal Gravity), DTGs (differential thermogravimetry), DTAs (Differential Thermal Analysis) and char yields; secondly, drawing curves of 1n[g(alpha) / T2] to 1 / T according to the thermal analysis kinetics theoretical equation, and determining reaction mechanism functions g(alpha) in the thermolysis process of the asphalt and the prepared flame-retardant asphalt through linear fitting of a least square method; thirdly, drawing a straight line of the 1n[g(alpha) / T2] to the 1 / T, solving kinetics parameter activation energies E and frequency factors A through a slope and an intercept; finally, comparing the E and the A of the asphalt with the E and the A of the prepared flame-retardant asphalt so as to completely and accurately evaluate the flame-retardant efficiency of the flame retardants with different types and doping quantities to the asphalt.

A titanium oxide showing sufficiently high photocatalytic activities by irradiation of visible light is provided. Using the titanium oxide, an excellent photocatalyst and photocatalyst coating composition are also provided. The titanium oxide has a selected ion chromatogram in which an evolution gas having 28 of a ratio of mass number to electric charge quantity exhibits at least one peak at about 600° C. or higher, the selected ion chromatogram being measured in a thermogravimetry-mass-spectroscopy.

The invention discloses a detection analysis method for an asphalt volatile organic compound (VOC). The detection analysis method adopts a combination manner of thermogravimetry-mass spectrometry (TG-MS) to directly carry out mass spectrometry on volatile gas in the procedure temperature controlling heating process during the operation of carrying out a thermal weight loss test on asphalt. The mass of an asphalt sample is 5-10mg. The program temperature control in the thermal weight loss testing process is raised to 250 DEG C at the speed of 10 DEG C / minute. The mass spectrometry adopts molecular weight scanning with the molecular weight from 0 to 300. A TG-MS coupled technology can be used for simultaneously determining the quality change of the asphalt and qualitatively and quantitatively analyzing the VOC in a heating state of the asphalt material and the escaping quantities of the VOCs of the different asphalt can be balanced; the relatively direct reference is provided for an asphalt VOC inhibitor researcher through determining VOC components, and the inhibition condition an asphalt VOC inhibitor of on the VOC can also be directly responded, so that the emission of the asphalt VOC is reduced.

In a thermomechanical measuring device and a thermogravimetry device, partition walls are provided in two sections such that two kinds of atmospheric gasses, which have passed a sample chamber and a detector chamber, respectively, do not flow back, and a thermally insulated gas mixing chamber is manufactured anew in the middle of the sample chamber and the detector chamber to make it possible to dilute a reactive gas and a water vapor gas having a high partial pressure. Consequently, it is possible to prevent moisture concentration to reduce an influence of water drops even in a high temperature and high humidity state at the time of humidity control and measurement.

A carbon material for a negative electrode for a lithium ion secondary battery, having a specific surface area of 1.5 to 6.5m2 / g, a tap density of 0.5 to 1.3g / cm3, and a Raman R value of 0.1 to 0.4. Further, this carbon material exhibits no diffraction peak in a diffraction angle range of 42.7 to 43.7 degrees in X-ray diffraction, has a d002 of 0.337nm or less, and exhibits at most one peak within a region of 500 to lower than 1000ºC in thermogravimetry-differential thermal analysis.

A flame retardant comprising an inorganic porous fine particle, a phosphazene compound represented by the following average compositional formula (1) wherein X is selected from the group consisting of a single bond, CH2, C(CH3)2, SO2, S, O, and O(CO)O, n is an integer of from 3 to 1000, d and e are numbers with 2d+e=2n, said phosphazene compound being supported on said inorganic porous fine particle, and a resin layer coating said inorganic porous fine particle with the phosphazene compound supported thereon, said resin thermally decomposing to lose weight by 10% at a temperature of from 300° C. to 500° C. as measured by thermogravimetry in the air at a heating rate of 10° C. / min.