Tag: M.W=400-500

In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Recommanded Product: 125-20-2, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 125-20-2, name is Thymolphthalein. In an article£¬Which mentioned a new discovery about 125-20-2

The Thermal Stability and Rheological Properties of Alkylated Carboxymethyl Starch

Several alkylated carboxymethyl starches (CMS) with different alkyl chain lengths were prepared. The influence of the number of alkyls on the thermal stability and rheological properties, such as thickening properties, salt-tolerance, temperature sensitivity and time-dependent rheological behavior, are discussed. The initial decomposition temperature (IDT) of alkylated CMS reached 263C ?293C which, as compared to the IDT for CMS itself (230C), indicated that the thermal stability of CMS was improved after being alkylated. The solution viscosities of the alkylated carboxymethyl starch increased with the increasing of alkyl length. With the alkyl chain length increasing from C2 to C8, the viscosity increased from 400?mPa¡¤s to 38000?mPa¡¤s. The weak hydrophobic aggregation of the alkyl groups did not improve the shear-resistance and relative hysteresis area. But the temperature sensitivity of alkylated CMS was improved as the chain length of the alkyl groups increased, as the activation energy (Ea) value decreased from 2.082?kJ¡¤mol?1 to 0.077?kJ¡¤mol?1; Improving the rigidity of the molecular chains and reducing the network structure of the hydrophobic contribution to the viscosity of the solution are benefits for improving the salt-tolerance and shear-resistance of the aqueous solution.

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Benzofuran – Wikipedia,
Benzofuran | C8H4431O – PubChem

One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, Recommanded Product: Crystal violet lactone, such as the rate of change in the concentration of reactants or products with time.In a article, mentioned the application of 1552-42-7, Name is Crystal violet lactone, molecular formula is C26H29N3O2

The novel thermochromic and energy-storage microcapsules with significant extension of color change range to different tones

In order to solve the problem of narrow color change range for common thermochromic material, the novel thermochromic and energy-storage microcapsules (TCEMs) was designed and synthesized by in-situ polymerization. The TCEMs contained optimizational thermochromic components and phase change materials, and exhibited the dual functional performances of thermochromic and energy-storage. Then, the TCEMs were applied to polyester/cotton blend fabric with waterborne polyurethane by coating process. The growing process, exterior morphology, color change effect, temperature-regulable behavior and thermal activity of the TCEMs and the treated fabrics were investigated. The results demonstrated that both TCEMs and modified fabrics had good energy-storage effect and remarkable thermochromic property. Especially, while surrounding temperature changed from 15 C to 45 C, the colors of TCEMs and treated fabrics could change from cool-tone (blue) to warm-tone (red), which significantly improved the color change range of the thermochromic material and made the color vary between different tones instead of changing in the region of similar color. The TCEMs exhibited great potentiality in the applying fields of decoration, anti-counterfeiting, architecture and intelligent textile, etc.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. Recommanded Product: Crystal violet lactone, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 1552-42-7, in my other articles.

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Benzofuran – Wikipedia,
Benzofuran | C8H4181O – PubChem

Synthetic Route of 125-20-2, Because a catalyst decreases the height of the energy barrier, its presence increases the reaction rates of both the forward and the reverse reactions by the same amount.125-20-2, Name is Thymolphthalein, molecular formula is C28H30O4. In a article£¬once mentioned of 125-20-2

Determination of fixed carbon in graphite ore by potassium dichromate oxidation-nonaqueous titration

After the organic carbon and carbonate were eliminated by low temperature combustion (which was lower than 500?) and addition of phosphoric acid to no bubble, the sample was placed and heated at low temperature in airtight experimental equipment system which was prefilled with oxygen. While, the fixed carbon (graphite carbon) in the sample was oxidized with potassium dichromate to generate carbon dioxide gas in a short time with sulfuric acid as reaction medium and silver sulfate as catalyst. After removal of hydrogen fluoride, hydrogen sulfide and moisture, the released gas was absorbed by the absorbent composed of potassium hydroxide, ethanol and ethanolamine (which was pre-adjusted to blue by ethanol-ethanolamine titration solution) and titrated by ethanol-ethanolamine titration solution with thymolphthalein as indicator. As for the titration end point, the blue color of absorbent should be kept for 1 min. On the basis of this, a determination method of fixed carbon with mass fraction less than 30% in graphite ore by nonaqueous titration was established. The proposed method was applied to the determination of fixed carbon in certified reference materials of graphite ore. The results were basically consistent with the certified values. The relative standard deviation (RSD, n=10) were between 1.1% and 3.1%. The fixed carbon in graphite ore actual sample was determined according to the experimental method, and the results were basically consistent with those obtained by gravimetric method and high temperature ignition-nonaqueous titration method. The recoveries of method were between 98% and 103%.

A reaction mechanism is the microscopic path by which reactants are transformed into products. Each step is an elementary reaction. In my other articles, you can also check out more blogs about 125-20-2

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Benzofuran – Wikipedia,
Benzofuran | C8H4286O – PubChem

Related Products of 1732-96-3, Chemistry is the science of change. But why do chemical reactions take place? Why do chemicals react with each other? The answer is in thermodynamics and kinetics.In a document type is Patent, and a compound is mentioned, 1732-96-3, Ethane-1,2-diyl bis(1,3-dioxo-1,3-dihydroisobenzofuran-5-carboxylate), introducing its new discovery.

METHOD OF FORMING A CURED EPOXY MATERIAL, CURED EPOXY MATERIAL FORMED THEREBY, PHENYLENE ETHER OLIGOMER-ANHYDRIDE REACTION PRODUCT USEFUL IN THE METHOD, AND COMPOSITE CORE INCORPORATING THE CURED EPOXY MATERIAL

A method of forming a cured epoxy material includes pre-reacting a phenylene ether oligomer with an anhydride hardener before adding an epoxy resin and a curing promoter, then curing the resulting composition. The method provides an improved balance of heat resistance and toughness relative to corresponding methods in which the phenylene ether oligomer is pre-reacted with the epoxy resin prior to addition of hardener, and in which all components are mixed simultaneously. The cured epoxy material can be used in the composite core of an aluminum conductor composite core reinforced cable.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Related Products of 1732-96-3. In my other articles, you can also check out more blogs about 1732-96-3

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Benzofuran – Wikipedia,
Benzofuran | C8H4130O – PubChem

In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Recommanded Product: Crystal violet lactone, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 1552-42-7, name is Crystal violet lactone. In an article£¬Which mentioned a new discovery about 1552-42-7

Influence of developer on structural, optical and thermal properties of a benzofluoran-based thermochromic composite

Thermochromic composites of benzofluoran dye, bisphenol A developer and octadecanol solvent were investigated to analyse how different molar ratios of developer influences the structural, optical and thermal properties. Increasing the amount of developer gives stronger absorption in the visible region and larger colour contrast between coloured and discoloured states. The colour clearing temperature of all studied composites is well below their melting point and the phase transitions are influenced only little by the content of the developer. The crystalline structure is fully controlled by the solvent; it changes from the gamma phase to the liquid at heating and returns through the rotator phase into the gamma phase at cooling. Crystallinity of the composites diminishes with the content of the developer, causing increased scattering of light. The dye: developer molar ratio equal to 1:3 was determined to be large enough to open lactone ring in all dye molecules. Colour hysteresis of such composites shrinks to practically single sigmoidal curve whereas the colour contrast still increases with higher amount of the developer. This effect could be attributed to developer – solvent interactions in a composite with lower crystallinity.

I hope this article can help some friends in scientific research. I am very proud of our efforts over the past few months and hope to 1552-42-7, help many people in the next few years.Recommanded Product: Crystal violet lactone

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Benzofuran – Wikipedia,
Benzofuran | C8H4165O – PubChem

One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, Recommanded Product: 125-20-2, such as the rate of change in the concentration of reactants or products with time.In a article, mentioned the application of 125-20-2, Name is Thymolphthalein, molecular formula is C28H30O4

Tadpole-type amphiphilic dendrimers with bulky dendrons: Adsorption and aggregation properties

Tadpole-type amphiphilic dendrimers featuring a hexadecyl chain and two or three poly(amidoamine) dendrons (C16-mdenGn, where m is the number of dendron scaffolds (2 or 3) and n is the dendron (den) generation (G) number (1, 2, 3, 4, or 5)) were synthesized using hexadecylamine or N-hexadecylethylenediamine as central scaffolds. These dendrimers were characterized by acid-base titration, surface tension, pyrene fluorescence, static light scattering (SLS), and small-angle neutron scattering (SANS), and showed clear breakpoints in their surface tension vs. concentration plots. This behavior was indicative of adsorption at the air/water interface and micelle formation in solution despite the bulky dendron structure (e.g., generations 3?5), contrasting the behavior of conventional surfactants. Contrary to our expectation, the C16-mdenGn dendrimers could be densely packed at the air/water interface owing to enhanced hydrogen bonding between amide groups in the case of higher generation numbers. Furthermore, the above dendrimers formed spherical micelles in solution at a concentration of 5.00 mmol dm?3 (pH 9), regardless of the dendron generation number. As the generation number was increased to 4 for C16-2denGn and 3 for C16-3denGn, aggregates of spherical micelles were observed. The radius of gyration of C16-mdenGn dendrimers was estimated as 2.0?2.5 nm, being almost independent of the hydrophilic dendron size.

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Benzofuran – Wikipedia,
Benzofuran | C8H4426O – PubChem

In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Recommanded Product: Thymolphthalein, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 125-20-2, name is Thymolphthalein. In an article£¬Which mentioned a new discovery about 125-20-2

Enhanced methanogenic co-degradation of propionate and butyrate by anaerobic microbiome enriched on conductive carbon fibers

Recent studies have shown that the addition of conductive materials can promote direct interspecies electron transfer (DIET) between bacteria and methanoarchaea. This study demonstrated that carbon fibers could significantly stimulate methanogenic conversion of propionate and butyrate as co-substrate, while only butyrate was completely degraded in the unamended control bioreactor. In the carbon fibers-amended bioreactor, specific methane production (mL-CH4/g CODInitial) and methanogenesis rate (d?1) increased by around 2.4 and 6.7 times, respectively. Various electroactive bacteria were abundant in the carbon fibers-amended bioreactor, whereas different known fermentative bacteria were abundant in the control. Moreover, carbon fibers substantially increased the abundance of Methanosaeta species. These results suggest that electroactive bacteria could be involved in DIET with Methanosaeta species enabling co-degradation of propionate and butyrate. Additionally, electrical conductivities of the biomass were comparable in both configurations, indicating that carbon fibers were the primary route for DIET.

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Benzofuran – Wikipedia,
Benzofuran | C8H4265O – PubChem

Electric Literature of 125-20-2, Because a catalyst decreases the height of the energy barrier, its presence increases the reaction rates of both the forward and the reverse reactions by the same amount.125-20-2, Name is Thymolphthalein, molecular formula is C28H30O4. In a article£¬once mentioned of 125-20-2

Biocomposites based on cellulose and starch modified urea-formaldehyde resin: Hydrolytic, thermal, and radiation stability

Two biocomposites based on cellulose (UFC) and starch modified urea formaldehyde (UFS) resin (F/U ratio of 0.8) were synthesized using the same procedure. The hydrolitical, thermal, and radiation stability of biocomposites are determined. Also, released formaldehyde during the acid hydrolysis is determined. Biocomposites based on modified UF resin have been irradiated with (50 kGy). Cellulose modified UF resin after gamma-radiation has 1.38% released formaldehyde; unmodified UF resin has 2.21% released formaldehyde. Thermal stability of biocomposites is determined using nonisothermal thermogravimetric analysis, differential thermal gravimetry (DTG), and differential thermal analysis with IR spectroscopy. Moving the DTG peak to higher temperatures indicates an increased thermal stability of cellulose modified UF resin, which is confirmed by the FTIR analysis. Gamma radiation most often causes a decrease in the intensity of the peaks in the FTIR spectrum.

A reaction mechanism is the microscopic path by which reactants are transformed into products. Each step is an elementary reaction. In my other articles, you can also check out more blogs about 125-20-2

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Benzofuran – Wikipedia,
Benzofuran | C8H4317O – PubChem

In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum.In a patent, 125-20-2, name is Thymolphthalein, introducing its new discovery. category: benzofuran

Citric acid-modified beta zeolite for polyoxymethylene dimethyl ethers synthesis: The textural and acidic properties regulation

Beta zeolite exhibits satisfactory catalytic activity in the synthesis of polyoxymethylene dimethyl ethers. However, the microporous channels of beta zeolite have adverse effects on mass transfer of macromolecules. In this work, it was found that the textural and acidic properties of catalysts could be improved by citric acid treatment. Extensive characterization confirmed that citric acid induced significant pore-expanding on catalysts, and its dealumination and realumination effect could lead to reduced amount of total acid sites and increased amount of Br¡ãnsted acid sites (BAS). Meanwhile, a good positive correlation was found between amount of external weak BAS and initial reaction rate. It was speculated that BAS with relatively weak acid strength might be the primary active sites in this reaction. Compared with the blank sample, the initial reaction rate of optimal catalyst was increased by 100 %, and the conversion of trioxane was increased by 86.5 %, indicating a significantly improved catalytic activity.

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Benzofuran – Wikipedia,
Benzofuran | C8H4412O – PubChem

In heterogeneous catalysis, the catalyst is in a different phase from the reactants. name: Thymolphthalein, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 125-20-2, name is Thymolphthalein. In an article£¬Which mentioned a new discovery about 125-20-2

Effect of edta on quartz and hematite flotation with starch/amine in an aqueous solution containing mn2+ ions

In this paper, a detailed study of the influence of Mn2+ ions on quartz and hematite flotation (at pH 10.5 with starch/amine as depressor/collector) in the absence and presence of ethylenediaminetetraacetic acid (EDTA) is presented. By using zeta potential measurement and a careful analysis of manganese species present in water for dosages in which manganese hydroxide precipitated, we confirmed that the depression of both minerals by Mn2+ ions is due to the following: (i) the adsorption of Mn hydroxy complexes (Mn2 (OH)3+ and Mn(OH)+); (ii) Mn2+ and mainly (iii) the precipitation of Mn(OH)2 on mineral surfaces. These effects hindered the adsorption of amine species on the surfaces of the minerals (quartz and hematite). EDTA was used to complex Mn2+ to restore the recoveries of both minerals. This was confirmed by the species distribution diagrams of Mn and EDTA?Mn in water. Conditioning with starch followed by amine at pH 10.5 enabled a selective separation of these minerals.

I hope this article can help some friends in scientific research. I am very proud of our efforts over the past few months and hope to 125-20-2, help many people in the next few years.name: Thymolphthalein

Reference£º
Benzofuran – Wikipedia,
Benzofuran | C8H4334O – PubChem