Dipropylene glycol monomethyl ether
(1ar,3s,9s,11as,11br)-1,1,3-trimethyl-1a,2,3,5,6,7,8,9,10,11,11a,11b-dodecahydro-1h-cyclopropa[3,4]benzo[1,2-a]cyclodecenyl tert-butyl(diphenyl)silyl ether Molecular Weight: Synonyms: Phenyl ether, Diphenyl oxide CAS #: EC Number: Molar Mass: g/mol Chemical Formula: (C₆H₅)₂O Hill Formula: C₁₂H₁₀O CAS number: Sigma Aldrich Fine Chemicals Biosciences Diphenyl Ether | | MFCD | g Manufacturer: Sigma Aldrich Fine Chemicals Biosciences G Diphenyl Ether | Purity: 99% | Mol Wt: | | MFCD | g. CAS: MDL: MFCD EINECS:
CAS Registry Numbers Page No. Dear Customer, It is with great pleasure and pride we present to you the Merck Life Science Price List We appreciate your support extended to our entire team in the last year. With the onset of new year, we are delighted to present to you our six portfolio brands. As we enter , we continue to focus on our mission to help scientists and researchers solve the toughest problems in life science.
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Reference materials are substances or materials having homogenous and well-established values of one or more of its properties. They play a vital role in ensuring accuracy of measurements through method calibration, validation of a measurement method, estimation of measurement uncertainty, or assigning values to materials. Reference materials are a critical component of analytical testing workflows and broader quality assurance schemes.
They are manufactured under stringent requirements and differ from other laboratory reagents in the certification and traceability of the data provided. From Certified Reference Materials CRMs and other quality grades of reference materials to certificates of analysis, metrological traceability, and other concepts, the world of reference materials is vast, and at times, confusing.
Reference materials are classified into five major categories based on their quality grades, from national metrology and other primary standards to Certified Reference Materials CRMs , Reference Materials RMs , Analytical Standards, and research grade or research chemicals. The certification and traceability requirements increase from one quality grade to the higher one.
The top-level is given standardization by the national governments, whereas specific ISO guidelines provide standardization for CRMs and RMs. Reference material producers must meet these ISO requirements to manufacture CRMs or RMs. For Certified Reference Materials, a Certificate of Analysis must be provided, and the information contained within is defined by the earlier mentioned ISO guidelines. The quality specifications for the last two levels are outlined by each independent producer rather than by a national government or ISO accreditations specific to CRMs and RMs.
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Polybrominated diphenyl ethers PBDEs are flame retardants and regarded as emerging contaminants and persistent organic pollutants POPs. Due to high lipophilicity and low biodegradability, they tend to accumulate in sediments. This study is to explore the feasibility of an integrated remedial approach, direct removal by emulsion recovery and subsequent biological reductive debromination.
A double emulsion water in oil in water was formulated and used in direct recovery of BDE in sediment samples. After this recovery operation, the residual oil left in sediments was used as an electron donor for anaerobic microbial reductive debromination. In order to improve the robustness of this direct recovery method, a variety of operational parameters and environmental variables were tested, such as mixing speed, mixing time, initial concentrations of BDE, salinity contents of sediment, and fractions of humic acids.
A biodegradation experiment with different humic acid contents and with or without residual emulsion was conducted to compare the biodegradation rates under different conditions. All samples were extracted by using accelerated solvent extraction and detected by a gas chromatography with an electron capture detector. In this study, we used an emulsion to recover BDE in simulated sediment samples with different salinity and humic acid contents.
BDE was recovered as much as The biodegradation of unrecovered BDE was assessed under anaerobic conditions with residual emulsion as an electron donor. The average half-life is Real sediment samples were also tested and the result indicated that this method is highly feasible.
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This application is a U. The present invention relates to an alcohol compound and an epoxy compound having a specific structure. The present invention also relates to a method for producing the same, and a composition, a composition for optical component formation, a film forming composition for lithography, a resist composition, a method for forming a resist pattern, a radiation-sensitive composition, a method for producing an amorphous film, an underlayer film forming material for lithography, a composition for underlayer film formation for lithography, a method for producing an underlayer film for lithography, a resist pattern formation method, a circuit pattern formation method, and a purification method.
Alcohol compounds having various properties such as optical properties, heat resistance, water resistance, moisture resistance, chemical resistance, electrical properties, mechanical properties, and dimensional stability and a bisphenol skeleton are known to be useful as resin raw materials or resin curing agents see Japanese Patent Laid-Open No. Epoxy resins are generally cured using various curing agents to form cured products excellent in mechanical properties, water resistance, chemical resistance, heat resistance, electrical properties, etc.
Therefore, the epoxy resins are used in a wide range of fields such as adhesives, coating materials, laminates, molding materials, and cast molding materials. Among them, epoxy compounds having a bisphenylfluorene skeleton, which can improve properties such as heat resistance as compared with conventional epoxy compounds such as a bisphenol A-based epoxy resin, have heretofore been proposed for usage required to have heat resistance see Japanese Patent No.
In recent years, a further improvement of the above properties has been required for resin raw materials or resin curing agents. Thus, there is a demand for additional novel alcohol compounds. Also, epoxy resins or the like intended for use in electronic materials such as semiconductor encapsulants are required to have a structure with various highly functional properties such as a high index of refraction, increased heat resistance, and decreased viscosity.
Thus, there is a demand for novel epoxy compounds. An object of the present invention is to provide a compound that can be used in raw materials for thermosetting resins or thermoplastic resins, resin curing agents, or electronic materials and has high heat resistance, and a method for producing the same, and a composition, a composition for optical component formation, a film forming composition for lithography, a resist composition, a method for forming a resist pattern, a radiation-sensitive composition, a method for producing an amorphous film, an underlayer film forming material for lithography, a composition for underlayer film formation for lithography, a method for producing an underlayer film for lithography, a resist pattern formation method, a circuit pattern formation method, and a purification method.
The inventor has, as a result of devoted examinations to solve the above problems, found out that a novel alcohol compound and a novel epoxy compound having a specific structure can solve the above problems, and reached the present invention.
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The present invention relates to a solid dispersion, a preparation method therefor, a chain-extended polyurethane using same, and an epoxy resin composition comprising same and, more particularly, to a solid dispersion in which an inorganic or organic material-derived isotropic or anisotropic substance is used as a dispersoid and dispersed at room temperature in a solid-phase dispersion medium such as polyols and sugars, whereby the dispersion can be easily stored and used, reduce transportation cost, prevent or alleviate the aggregation or precipitation caused during the storage of products, with the results of working efficiency improvement and processing cost reduction, and, when applied to polyurethane, can increase strength and provide an improved strength, compared to conventional curing agent, a preparation method therefor, a chain-extended polyurethane using same, and an epoxy resin composition comprising same.
However, with the aim of changing the material of the dispersoid, miniaturizing the particle size or controlling the particle shape, it is difficult to stabilize the dispersoid, so that the dispersoid may agglomerate or settle in a short time in the dispersion medium. The problems of aggregation and settling of dispersoids lead to a decrease in productivity, processing properties, handling properties and product yield, as well as a decrease in properties, material properties and quality of the final product in the manufacture of a dispersion.
In addition, it is known to cause undesirable phenomena such as decrease in transparency, gloss and coloring power, color stains and cracks in appearance. A dispersant is used to suppress aggregation and settling of such dispersoids and to achieve dispersion stabilization. Previously, as disclosed in Korean Patent Laid-open Publication No. However, in terms of diversification of the dispersoid and dispersion medium, micronization of the particle size of the dispersoid, diversification of the particle shape, high quality of the final product, improvement of productivity and high demand for processing characteristics, the previously proposed dispersant cannot sufficiently meet the required characteristics.
The biggest problem with existing dispersion compositions is that when a dispersion composition using water as a dispersion medium is applied to polyurethane resins and epoxy resins, the process of manufacturing a master batch of water and polyol or a master batch of water and epoxy is additionally required and that a surfactant is needed to prevent agglomeration of dispersoids.
Accordingly, there is a need for the development of a dispersion and dispersion composition capable of preventing or improving the aggregation and settling of the dispersion without the use of a separate dispersant or surfactant, a chain extender for applying the dispersion to polyurethane, etc. In order to achieve the technical purpose, in the first aspect, the present invention provides a solid dispersion comprising a dispersoid and a dispersion medium in which the dispersoid is dispersed, wherein the dispersoid is an organic particle, an inorganic particle or a mixture thereof, and the dispersion medium is a non-aqueous dispersion medium in a solid state at room temperature.
In another aspect, the present invention provides a dispersion composition comprising the above solid dispersion.
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Diphenylether is a chemical compound from the group of ethers and the simplest diarylether. The compound consists of two benzene rings linked by an oxygen atom. Diphenyl ether and many of its properties were first published in early It is represented by a Ullmann condensation , through the reaction of phenol and bromobenzene in the presence of a base and a catalyst such as copper :.
Due to side reactions, diphenyl ether is also a significant by-product in the high pressure hydrolysis of chlorobenzene in the production of phenol. Diphenyl ether is used as a rose perfume for soaps and detergents and as a heat transfer medium. It is the starting material for many derived compounds and chemical syntheses. For example, its brominated derivatives polybrominated diphenyl ethers are used as flame retardants in many plastics and textiles.
The aminofen derivative is used to produce diphenyl ether herbicides. A eutectic mixture of biphenyl and diphenyl ether is offered as a heat transfer oil under the trade names Dowtherm A and Therminol VP Diphenyl ether forms flammable vapor-air mixtures at high temperatures. The explosion range is between 0. The substance therefore falls into temperature class T1.
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Manufacturer: Sigma Aldrich Fine Chemicals Biosciences G Diphenyl Ether | Purity: 99% | Mol Wt: | | MFCD | g Catalog No. Product name Diphenyl ether: Product Number: Brand: Aldrich CAS-No.: Relevant identified uses of the substance or mixture and uses advised against Identified uses: Laboratory chemicals, Synthesis of substances Details of the supplier of the safety data sheet Company: Sigma-Aldrich Spruce Street.
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Biphenyl oxide. Diphenyl ether [Wiki]. Diphenyl oxide.