Category: 18959-30-3

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To provide high-temperature polyimide matrix resins, novel carborane-containing thermosetting polyimides are presented. First, the low-viscosity carborane-containing imide oligomers are synthesized using newly designed 1-(3-amino-4-tolyl)-2-(4-aminophenyl)-o-carborane and aromatic dianhydride as monomers, 4-phenylethynyl phthalic anhydride as the end-capping reagent. Followed by thermal curing, the resulting polyimides show high Tg (?500 C) and above 92.1% char yield at 800 C both in nitrogen and air atmosphere due to the incorporation of the bulky carborane cages. Aging studies, performed at 400 and 500 C for 5 h in air on a carborane-containing polyimide and a carborane-free polyimide, show that the polyimide with carborane groups possesses excellent thermo-oxidative stability. Moreover, the novel polyimides exhibit constant and relatively low coefficient of thermal expansion values over a wide range of temperature, indicative of a remarkable dimensional stability. Thus, this study clearly demonstrates the viability of the incorporation of carborane cages to access polyimide thermosets with ultrahigh Tg and thermo-oxidative stability.

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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H2975O – PubChem

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Radiation effects on polyimide blends were studied at different irradiation temperatures and with different irradiation doses. The irradiation polyimides were the blends of linear polyimide (HQDPA/ODA) and 4-phenylethynyl phthalic anhydride end-capped oligomer polyimide. The tensile strength and the elongation at break of irradiated films were determined as the function of irradiation temperature and dose. Under proper conditions crosslinking reaction occurred when the polyimide blends were irradiated at high temperature. The mechanical properties of irradiated polyimide blends were found to be different from the linear polyimide.

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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H2973O – PubChem

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It is still a big challenge to develop high performance polymer foams with outstanding flame retardancy and high thermal stability through a facile strategy. Herein, starting from synthesizing phenylethynyl end-capped all-aromatic liquid crystalline polyester with good processability, a new kind of flame retarding liquid crystalline thermosetting foam (LCTF) was fabricated without adding additional flame retardant and foaming agent. LCTF simultaneously shows outstanding flame retardancy (UL94?V0 grade, 36.4% of limit oxygen index), excellent smoke suppression and high thermal stability, which are the best values reported so far among intrinsic flame retarding foams. The mechanism of outstanding flame retardancy is revealed by investigating chemical and morphological structures with the aid of three-dimensional reconstruction of morphology. Roles from gas phase and condensed phase are proved to be responsible for unique flame retardancy. The application of LCTF in thermal insulation was also evaluated.

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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H2968O – PubChem

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Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions.Application In Synthesis of 4,5-Difluorophthalic Anhydride, you can also check out more blogs about18959-30-3

Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments. Application In Synthesis of 4,5-Difluorophthalic Anhydride. Introducing a new discovery about 18959-30-3, Name is 4,5-Difluorophthalic Anhydride

It is still a big challenge to develop high performance polymer foams with outstanding flame retardancy and high thermal stability through a facile strategy. Herein, starting from synthesizing phenylethynyl end-capped all-aromatic liquid crystalline polyester with good processability, a new kind of flame retarding liquid crystalline thermosetting foam (LCTF) was fabricated without adding additional flame retardant and foaming agent. LCTF simultaneously shows outstanding flame retardancy (UL94?V0 grade, 36.4% of limit oxygen index), excellent smoke suppression and high thermal stability, which are the best values reported so far among intrinsic flame retarding foams. The mechanism of outstanding flame retardancy is revealed by investigating chemical and morphological structures with the aid of three-dimensional reconstruction of morphology. Roles from gas phase and condensed phase are proved to be responsible for unique flame retardancy. The application of LCTF in thermal insulation was also evaluated.

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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H2968O – PubChem

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Chemistry is traditionally divided into organic and inorganic chemistry. Quality Control of 4,5-Difluorophthalic Anhydride, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 18959-30-3

A series of phenylethynyl-terminated oligoimides based on 2,3,3?,4?-biphenyltetracarboxylic dianhydride (a-BPDA), 2,2?-bis(trifluoromethyl)benzidine (TFDB), and bis(p-aminophenoxy)dimethyl silane (APDS) with different siloxane content and various calculated molecular weights were synthesized. The effect of siloxane structure on the processability of oligoimides and the thermal stability of cured polyimides (PIs) was investigated. The results indicated that the oligoimides have lower melt viscosity and broader processing window with the incorporation of flexible siloxane segment. The thermal stability of the cured PIs can be significantly enhanced by high-temperature postcuring due to the oxidative cross-linking of siloxane. The polyimide PI-s1-15 exhibited good balance between processability and thermal stability with the minimum melt viscosity of 0.4 Pa·s at 325C and glass transition temperature as high as 470C after postcuring at 450C. The carbon fiber-reinforced composite T800/PI-s1-15 displayed excellent high-temperature performance, which gave the flexural strength and interlaminar shear strength of 703 and 33 MPa, respectively, when tested at the temperature as high as 450C.

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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H2953O – PubChem

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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, 18959-30-3, name is 4,5-Difluorophthalic Anhydride, introducing its new discovery. Recommanded Product: 18959-30-3

The invention relates to an easy-to-industrial production of high temperature resistant coupling agent and its preparation method. The present invention is to solve the silanes coupling agent the thermal stability is weak, while at the same time resistance to bacterial coupling agent is difficult to industrial preparation and the like. The invention high temperature resistant coupling agent preparation method is as follows: under the protection of nitrogen, the amino silane coupling agent added in three-mouth flask, then adding norbornene […] or 4 – phenylacetylene phthalic anhydride monomer, first stirring at room temperature the reaction 2 – 8 the H, make reaction monomer is mixed and dispersed evenly, the stirring rate control in 50 – 800 the R/min, then to 5 – 50 C/min of the rate of rise of the temperature of the reaction solution is adjusted to be 150 – 250 C, continue to reaction 2 – 10 and H, the final stop stirring, cooling the sample after crushing, get. The high temperature resistant coupling agent material is easy to industrial production, applied to the electronic industry in the protection of the metal surface. (by machine translation)

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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H2919O – PubChem

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One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, Product Details of 18959-30-3, such as the rate of change in the concentration of reactants or products with time.In a article, mentioned the application of 18959-30-3, Name is 4,5-Difluorophthalic Anhydride, molecular formula is C8H2F2O3

A series of addition-type imide oligomer (degree of polymerization: n=1-9) derived from 2,3,3′,4′-diphenyl ether tetracarboxylic acid dianhydride (a-ODPA), 3,4′-oxydianiline (3,4′-ODA) and 4-phenylethynylphthalic anhydride (PEPA) was synthesized by thermal imidization. The resultant oligomers were characterized for their chemical architecture, thermal property, and processability. The experimental results showed that oligomers PI-1 and PI-2 had somewhat crystalline phase. PI-4, PI-6 and PI-9 exihibited high solubility in solvents. These imide oligomers have a very low melt viscosity, and thus provide wide processing window by the rheological behaviors. Furthermore, the cured polyimides exhibited excellent thermal stability under N2 atmosphere. The temperatures of 5? weight loss in N2 atmosphere were all above 524C.

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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H2980O – PubChem

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Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Synthetic Route of 18959-30-3. In my other articles, you can also check out more blogs about 18959-30-3

Synthetic Route of 18959-30-3, 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 Article, and a compound is mentioned, 18959-30-3, 4,5-Difluorophthalic Anhydride, introducing its new discovery.

A synthetic route is described to a new monomer, N-(2-biphenylenyl)-4-[2?-phenylethynyl]phthalimide (BPP), which contains both phenylethynyl and biphenylene reactive functional groups. The monomer can be made either from N-(2-biphenylene)acetamide or 2-aminobiphenylene, by reaction with the phenylethynyl-containing anhydride. The monomer was characterised fully and the thermal cure of the material was studied by infrared (IR) spectroscopy and differential scanning calorimetry (DSC). The IR spectra showed that the phenylethynyl group reacted completely within 1 h at 370C. DSC showed the polymerisation exotherm of BPP centred at 379C, lower than two NASA-developed phenylethynyl-terminated imide (PETI) resins. In comparison with the PETI systems, the Tg of cured BPP was ca. 100 C higher, making it a candidate for possible high temperature applications.

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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H2926O – PubChem

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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 18959-30-3

Synthetic Route of 18959-30-3, 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.18959-30-3, Name is 4,5-Difluorophthalic Anhydride, molecular formula is C8H2F2O3. In a article，once mentioned of 18959-30-3

Novel aromatic polyimides, both thermoplastic and thermosettable, are disclosed based on use of asymmetric diamines and symmetric dianhydrides with either a functional endcap for further thermosetting or a non-functional endcap for retention of thermoplastic properties. Both aromatic polyimides have sufficient physical properties to be useful in 3D printing.

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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H2909O – PubChem

Discovery of 4,5-Difluorophthalic Anhydride

The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 18959-30-3 is helpful to your research. Reference of 18959-30-3

Reference of 18959-30-3, Catalysts function by providing an alternate reaction mechanism that has a lower activation energy than would be found in the absence of the catalyst. In some cases, the catalyzed mechanism may include additional steps.In a article, 18959-30-3, molcular formula is C8H2F2O3, introducing its new discovery.

Thermal transitions and reaction kinetics of polyhedral oligomeric silsesquioxane (POSS) with phenylethynylphthalimide (PEPI) moieties were investigated. Specifically, this study was designed to probe the influence of the POSS peripheries, types of spacer group in between the PEPI and the SiO 1.5 core, the architecture of the PEPI arrangement with respect to the SiO1.5 core, and the number of PEPI groups per cage on the thermal transitions and the cross-linking reaction of phenylethynyl. PEPI-POSS compounds with isobutyl peripheries exhibited lower melting temperatures as compared to those with phenyl periphery, consequently these isobutyl PEPI-POSS derivatives have a higher phenylethynyl reaction rate, although the onset of reaction temperature was not significantly affected. Changing the spacer group from propyl to phenyl causes an increase in the melting transition temperature along with a higher heat of fusion at melting; however, the more rigid phenyl spacer enables the PEPI-POSS to form a higher degree of crystallinity upon cooling. The more rigid phenyl spacer also initiates the polyene reactions at lower temperatures. For POSS with PEPI attached to either side of the cage, there are two isomers with respect to the SiO1.5 core. This mixture of two isomers inhibits the formation of crystallinity as compared with the “pendent” derivative where both PEPI groups come off from the same corner of POSS cage. Finally, it was found that these PEPI-POSS molecules have reaction kinetics and onset temperatures on par with organic hexafluorophenylethynyl oligoimides, which make these PEPI-POSS molecules excellent candidates as nanocomposite additives in high performance composite applications.

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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H2961O – PubChem