09/18/21 News A new application about 18959-30-3

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Liquid crystalline polymers (LCPs) have potential as multifunctional, environmentally friendly coatings for aerospace, overcoming the disadvantages of current materials. Their use, however, has been hindered mainly by their poor adhesion strength. The present work studies novel liquid crystalline thermosetting polymers (LCTs), which can overcome the disadvantages of commercial LCPs for protective coatings in aerospace applications. Phenylethynyl terminated liquid crystalline oligomers based on 4-hydroxybenzoic acid (HBA) and 6-hydroxy-2-naphthoic acid (HNA) were synthesized and melt-pressed on grit-blasted aluminum to obtain 25 mum and 80 mum thick coatings. The presence of coating defects and curing kinetics were investigated, and the adhesion, mechanical properties and environmental resistance were compared with a commercial LCP reference material (Vectra). The LCTs showed highly improved adhesion; moreover, fully cured LCTs are harder and stiffer than commercial LCPs, which are expected to increase their wear and impact resistance. The coatings showed no swelling, peeling, or blistering after 500 h of full immersion in fluids such as jet fuel and turbine oil; furthermore, LCTs resisted 1000 h in corrosive fog (salt-spray) and hot moisture. Exposed samples retained their hardness, modulus, and pull-off strength, evidencing the outstanding chemical resistance of these LCTs. Our findings showed the potential of LCTs as protective and wear resistant coatings, particularly in the aggressive environments of aerospace applications. However, results suggest that exposed coating/substrate interfaces constitute paths for environmental attack. Further research aims at elucidating the possible mechanisms.

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Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H2933O – PubChem

14-Sep-2021 News Brief introduction of 18959-30-3

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18959-30-3, Name is 4,5-Difluorophthalic Anhydride, belongs to benzofurans compound, is a common compound. Quality Control of 4,5-Difluorophthalic AnhydrideIn an article, once mentioned the new application about 18959-30-3.

Disclosed herein is a polyimide resin including a silica filler surface-treated with a fluorine-containing compound, and a polyimide film formed using the polyimide resin. The polyimide resin has improved dispersibility and heat resistance because the surface of a silica filler is fluorinated.

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Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H2912O – PubChem

September 13,2021 News Awesome Chemistry Experiments For 18959-30-3

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Reference 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 Patent, and a compound is mentioned, 18959-30-3, 4,5-Difluorophthalic Anhydride, introducing its new discovery.

PROBLEM TO BE SOLVED: To provide a polyfunctional amide acid compound which, when used as a crosslinking agent of a resin composition, achieves crosslinking at high density and an improvement in the elastic modulus of a resin molding, and a polyfunctional imide compound as a derivative thereof. SOLUTION: This invention provides a novel polyfunctional amide acid compound obtained by a reaction between triamine or tetraamine and dicarboxylic anhydride, and a polyfunctional imide compound as a derivative thereof. COPYRIGHT: (C)2015,JPO&INPIT

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Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H2917O – PubChem

13-Sep-2021 News Simple exploration of 18959-30-3

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

Carborane-containing imide compound (Carb-PEPA) was synthesized and added into fluorinated phenylethynyl terminated imide oligomer (AFR-PEPA). The thermal degradation of Carb-PEPA was studied by thermogravimetric analyzer coupled with Fourier transform infrared analysis (TG-FTIR), in situ FTIR and pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS). The results show that the Carb-PEPA possesses high char yield in both air and nitrogen due to the formation of B-O bonds in thermal degradation process as identified by TG-FTIR and in situ FTIR. A thermal degradation mechanism for the Carb-PEPA was proposed. The Carb-PEPA crosslinks to form polyimide in the early heating process. Then the degradation of Carb-PEPA happens at higher temperatures, while further degradation could be effectively prevented due to the formation of a protection layer of boron oxide compound. The thermal stabilities of AFR-PEPA and AFR-PEPA containing 15 wt% Carb-PEPA (AFR-PEPA-Carb-15) were also studied by TGA and TG-FTIR. It was observed that AFR-PEPA’s residual weight ratios at 800 C in air and nitrogen increased by 20% and 13.3% respectively with the addition of 15 wt% Carb-PEPA.

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Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H2985O – PubChem

3-Sep-2021 News Final Thoughts on Chemistry for 18959-30-3

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In heterogeneous catalysis, the catalyst is in a different phase from the reactants. HPLC of Formula: C8H2F2O3, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 18959-30-3, name is 4,5-Difluorophthalic Anhydride. In an article,Which mentioned a new discovery about 18959-30-3

The high temperature curing reactions of oligomers bearing two phenylethynyl groups have previously been utilized to produce attractive new materials, but are not well understood. A model aryl ether imide compound with one such moiety was used to elucidate some of the chemistry occurring during these processes. It was demonstrated that oligomeric molecular weight soluble products were formed by thermal initiation at 375 C under nitrogen during these reactions, along with low molecular weight fragments derived from the model compound. These fragments were demonstrated to contain aliphatic protons in place of the phenylethynyl group and constitute about 5% of the overall material. Reactions of the model compound with deuterated biphenyl indicated that the reactive intermediates formed from the phenylethynyl moiety are able to abstract aromatic deuterium atoms in the presence of aromatic protons. However, these fragments appear to be side products not directly involved with the main curing reactions that occur after most of the carbon-carbon triple bonds have been reacted. The high temperature curing reactions of oligomers bearing two phenylethynyl groups have previously been utilized to produce attractive new materials, but are not well understood. A model aryl ether imide compound with one such moiety was used to elucidate some of the chemistry occurring during these processes. It was demonstrated that oligomeric molecular weight soluble products were formed by thermal initiation at 375C under nitrogen during these reactions, along with low molecular weight fragments derived from the model compound. These fragments were demonstrated to contain aliphatic protons in place of the phenylethynyl group and constitute about 5% of the overall material. Reactions of the model compound with deuterated biphenyl indicated that the reactive intermediates formed from the phenylethynyl moiety are able to abstract aromatic deuterium atoms in the presence of aromatic protons. However, these fragments appear to be side products not directly involved with the main curing reactions that occur after most of the carbon-carbon triple bonds have been reacted. (C) 2000 Published by Elsevier Science Ltd. All rights reserved.

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Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H2935O – PubChem

Awesome and Easy Science Experiments about 18959-30-3

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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

In continuing studies to develop low melt viscosity phenylethynyl end-capped imide oligomers for aerospace applications, new kinds of all-aromatic phenylethynyl-terminated imide oligomers were prepared by the reaction of 3,3?,4,4?-benzophenonetetracarboxylic dianhydride (BTDA) or biphenylenetetracarboxylic dianhydride (s-BPDA) with 2,5-bis(4-aminophenoxy)-biphenyl (p-TPEQ) and 4-phenylethynylphthalic anhydride (PEPA) or 4-(1-phenylethynyl)1,8-naphthalic anhydride (PENA). The oligomers bearing pendant phenyl groups exhibit much lower melt viscosities at low temperatures, and thus provide wide processing window. The thermal curing process of the oligomers was investigated with DSC. The tensile and thermal properties of the cured films were evaluated. Oligomers derived from PENA cured at lower temperatures and the corresponding cured polymers show better hydrolytic stability than those of PEPA. Results showed that the utilization of diamine monomer (p-TPEQ) can improve the processability and solubility of phenylethynyl-terminated imide oligomers without sacrificing their thermo-oxidative stability.

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Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H2960O – PubChem

Properties and Exciting Facts About 18959-30-3

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. Quality Control of 4,5-Difluorophthalic Anhydride, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 18959-30-3, in my other articles.

One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, Quality Control of 4,5-Difluorophthalic Anhydride, 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 novel carborane-containing phenylethynyl terminated imide compound (Carb-PEPA) as a modifier for fluorinated phenylethynyl terminated imide oligomer (AFR-PEPA) was synthesized and characterized by FT-IR and 1H-NMR. The resin systems consisting of Carb-PEPA and AFR-PEPA (AFR-PEPA-Carb) were prepared with different weight fractions of Carb-PEPA. The thermal curing kinetics and thermal stability of the imide compound and resultant resin systems were analyzed by using DSC and TGA respectively. The relevant kinetic data were determined by a Kissinger method. The results show that the glass transition temperatures (Tg) of the cured resin systems increase with the addition of Carb-PEPA. The imide system containing 20 wt% Carb-PEPA (AFR-PEPA-Carb-20) exhibits the highest Tg of 389.5 C due to the high steric hindrance of carborane. The char yield of the resin was also increased with the introduction of the carborane structure in the system. The kinetic data indicate that AFR-PEPA/Carb-PEPA imide blends have higher activation energy E and frequency factor A than AFR-PEPA imide oligomers.

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Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H2984O – PubChem

A new application about 4,5-Difluorophthalic Anhydride

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Related Products of 18959-30-3, Chemistry is the experimental science by definition. We want to make observations to prove hypothesis. For this purpose, we perform experiments in the lab. 18959-30-3, Name is 4,5-Difluorophthalic Anhydride,introducing its new discovery.

Hydrolysis and bromination of phthalic anhydride in water gave a mixture of the monosodium salt of 4-bromophthalic acid. These were reacted with phenylacetylene under Sonogashira coupling reaction conditions in an aqueous medium. Acidification afforded 4-phenylethynylphthalic acid and then dehydration of this gave 4-phenylethynylphthalic anhydride in 76% overall yield. Compared with traditional synthetic methods, this method has the advantage of low cost, convenient manipulation and is environmentally friendly.

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Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H2977O – PubChem

New explortion of 4,5-Difluorophthalic Anhydride

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Related Products of 18959-30-3, A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 18959-30-3, Name is 4,5-Difluorophthalic Anhydride, molecular formula is C8H2F2O3. In a Article,once mentioned of 18959-30-3

A series all-aromatic poly(esterimide)s with different molar ratios of N-(3?-hydroxyphenyl)-trimellitimide (IM) and 4-hydroxybenzoic acid (HBA) (IM/HBA = 0.3/0.7 and 0.7/0.3) was prepared with the aim to design flexible high Tg films. Melt-pressed films, either from high molecular weight polymer or cured phenylethynyl precursor oligomers, exhibit Tgs in the range of 200 C to 242 C and are brittle. After a thermal stretching procedure, the films became remarkably flexible and very easy to handle. In addition, the thermally stretched 3-IM/7-HBA and 7-IM/3-HBA films show tensile strengths of 108 MPa and 169 MPa, respectively. Thermal treatment increased the Tg of 3-IM/7-HBA from 205 C to 248 C, whereas the Tg of 7-IM/3-HBA increased from 230 C to 260 C.

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Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H2932O – PubChem

Brief introduction of 4,5-Difluorophthalic Anhydride

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Reference of 18959-30-3, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.18959-30-3, Name is 4,5-Difluorophthalic Anhydride, molecular formula is C8H2F2O3. In a Patent,once mentioned of 18959-30-3

High temperature resins containing phenylethynyl groups that are processable by transfer molding have been prepared. These phenylethynyl containing oligomers were prepared from aromatic diamines containing phenylethynyl groups and various ratios of phthalic anhydride and 4-phenylethynlphthalic anhydride in glacial acetic acid to form a mixture of imide compounds in one step. This synthetic approach is advantageous since the products are a mixture of compounds and consequently exhibit a relatively low melting temperature. In addition, these materials exhibit low melt viscosities which are stable for several hours at 210-275 C., and since the thermal reaction of the phenylethynyl group does not occur to any appreciable extent at temperatures below 300 C., these materials have a broad processing window. Upon thermal cure at ?300-350 C., the phenylethynyl groups react to provide a crosslinked resin system. These new materials exhibit excellent properties and are potentially useful as adhesives, coatings, films, moldings and composite matrices.

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Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H2904O – PubChem