Tag: 200-300

HPLC of Formula: 2657-87-6《Effect of atomic oxygen on corrosion and friction and wear behavior of polyimide composites》 was published in 2020. The authors were Duan, Chunjian;He, Ren;Li, Song;Yang, Rui;Shao, Mingchao;Yang, Zenghui;Zhang, Nan;Yuan, Ping;Wang, Tingmei;Wang, Qihua, and the article was included in《Journal of Applied Polymer Science》. The author mentioned the following in the article:

Thermosetting polyimide (TPI) composite with better wear resistance and lower friction was obtained with various functional fillers after a high-low temperature cycle test. Nevertheless, taking into consideration of harsh space condition, the friction and wear behavior of TPI composite were also explored after at. oxygen (AO) irradiation It reveals that TPI composite behaves excellent properties against AO mainly attributed to g-C₃N₄ with more neg. electronegativity N than carbon atom. Moreover, the mechanism of friction and wear demonstrated that degradation caused by AO led to TPI composite surface with special “carpet-like” morphol. and this resulted into lubrication failure, especially when temperature was increased from 200 °C to 350 °C. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48441. To complete the study, the researchers used 3-(4-Aminophenoxy)aniline (cas: 2657-87-6) .

3-(4-Aminophenoxy)aniline is one of ethers-buliding-blocks. Ethers feature bent C–O–C linkages. In dimethyl ether, the bond angle is 111° and C–O distances are 141 pm. The barrier to rotation about the C–O bonds is low. HPLC of Formula: 2657-87-6 The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp3.

Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Ting, Kuang-Min;Xu, Jun;Guo, Bao-Hua published 《A novel vacuum-assisted method for fabricating flexible polyimide foams from 3,3′,4,4′-oxydiphthalic anhydride/4,4′-oxydianiline》 in 2017. The article was appeared in 《High Performance Polymers》. They have made some progress in their research.HPLC of Formula: 2657-87-6 The article mentions the following:

In this research, a novel method for fabricating flexible polyimide foams was developed. The foam was derived from the precursor synthesized via esterification of 3,3′,4,4′-oxydiphthalic anhydride and 4,4′-oxydianiline. After drying process, the remaining solvent acted as blowing agent. By adjusting the synthesis condition, low-mol. weight precursor was obtained and can be foamed under environment temperature With this novel type of precursor and vacuum-assisted foaming process, we could easily obtain any shape of foams, which was easy to process under relatively low temperature The foam could be imidized later in order to improve mech. strength. During the imidization process, in situ Fourier transform IR (FTIR) anal. was applied to analyze the variation of the imidization percentage with time. The d. of the foams could be adjusted from 12 to 30 kg m^-3 with uniform cell structure. Other properties of foams were also investigated. The glass transition temperature of the precursor was 70°C, which is obviously lower than that of the usual previously reported. The 5% and 10% weight loss temperatures of the finally imidized foam can reach up to 567°C and 593°C, resp. The foams belong to open cell structure with 98% open cell content. The limiting oxygen index of the foams varied from 38.6 to 41.9, depending on foam densities. The compressive strength of the foam ranged from 30.6 to 90.6 kPa when the d. changed from 15 to 28 kg m^-3. In addition, the in situ FTIR anal. was applied to analyze the imidization percentage of the foam during imidization process.3-(4-Aminophenoxy)aniline (cas: 2657-87-6) were involved in the experimental procedure.

3-(4-Aminophenoxy)aniline is one of ethers-buliding-blocks. Ethers lack the hydroxyl groups of alcohols. Without the strongly polarized O―H bond, ether molecules cannot engage in hydrogen bonding with each other. HPLC of Formula: 2657-87-6Ethers do have nonbonding electron pairs on their oxygen atoms, however, and they can form hydrogen bonds with other molecules (alcohols, amines, etc.) that have O―H or N―H bonds.

Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Tang, Huali;Huang, Bin;Xie, Xiujun;Yan, Tao;Cai, Mingzhong published 《Synthesis and properties of novel soluble fluorinated aromatic polyamides containing 4-benzoyl-2,3,5,6-tetrafluorophenoxy pendant groups》 in 2018. The article was appeared in 《Journal of Polymer Research》. They have made some progress in their research.Quality Control of 3-(4-Aminophenoxy)aniline The article mentions the following:

A new diaroyl chloride monomer, 5-(4-benzoyl-2,3,5,6-tetrafluorophenoxy)isophthaloyl dichloride (BTFPIPC), was prepared in a three-step synthesis. Six novel aromatic polyamides containing 4-benzoyl-2,3,5,6-tetrafluorophenoxy pendant groups were synthesized by low temperature polycondensation of BTFPIPC with six aromatic diamines in N,N-dimethylacetamide (DMAc). All these new polymers are amorphous and readily soluble in various dipolar solvents such as DMAc, N-methyl-2-pyrrolidinone (NMP), N,N-dimethylformamide (DMF), and DMSO (DMSO) at room temperature These polymers showed glass transition temperatures between 212 and 243 °C and 5% weight loss temperatures ranging from 439 °C to 456 °C. These polyamides could be cast into transparent, flexible and strong films from DMAc solution with tensile strengths of 73.5-85.4 MPa, tensile moduli of 2.06-2.72 GPa, and elongations at break of 6.4-9.3%. These new polyamide films exhibited low dielec. constants of 3.26-3.57 (1 MHz), lower water uptakes in the range of 1.27-2.28%, and excellent transparency with an UV-visible absorption cut-off wavelength in the 326-373 nm range. Primary characterization of these new polyamides shows that they might serve as new candidates for processable high-performance polymeric materials.3-(4-Aminophenoxy)aniline (cas: 2657-87-6) were involved in the experimental procedure.

3-(4-Aminophenoxy)aniline is one of ethers-buliding-blocks. Ethers lack the hydroxyl groups of alcohols. Without the strongly polarized O―H bond, ether molecules cannot engage in hydrogen bonding with each other. Quality Control of 3-(4-Aminophenoxy)anilineEthers do have nonbonding electron pairs on their oxygen atoms, however, and they can form hydrogen bonds with other molecules (alcohols, amines, etc.) that have O―H or N―H bonds.

Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

SDS of cas: 2235-01-0In 2008, Crich, David;Li, Ming published 《Block Synthesis of Tetra- and Hexasaccharides (β-D-Glycero-D-manno-Hepp-(1→4)-[α-L-Rhap-(1→3)-β-D-glycero-D-manno-Hepp-(1→4)]_n-α-L-Rhap-OMe (n = 1 and 2)) Corresponding to Multiple Repeat Units of the Glycan from the Surface-Layer Glycoprotein from Bacillus thermoaerophilus》. 《Journal of Organic Chemistry》published the findings. The article contains the following contents:

A fully stereocontrolled block synthesis of the title tetra- and hexasaccharides has been achieved taking advantage of the ability of the 4,6-O-benzylidene acetal to control the stereochem. of the β-D-glycero-D-mannoheptopyranoside unit and of a 2,3-O-diphenylmethylene acetal to install the α-L-rhamnopyranosidic linkages. Comparison of the spectral data for the hexasaccharide with that of the natural isolate confirms the structure of this very unusual and structurally challenging glycan. The experimental procedure involved many compounds, such as Dimethoxydiphenylmethane (cas: 2235-01-0) .

The unique properties of ethers (i.e., that they are strongly polar, with nonbonding electron pairs but no hydroxyl group) enhance the formation and use of many reagents. For example, Grignard reagents cannot form unless an ether is present to share its lone pair of electrons with the magnesium atom.SDS of cas: 2235-01-0

Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Electric Literature of C15H16O2《Hafnium(IV) Chloride Catalyzes Highly Efficient Acetalization of Carbonyl Compounds》 was published in 2019. The authors were Bonilla-Landa, Israel;Lopez-Hernandez, Emizael;Barrera-Mendez, Felipe;Salas, Nadia C.;Olivares-Romero, Jose Luis, and the article was included in《Current Organic Synthesis》. The author mentioned the following in the article:

Hafnium(IV) tetrachloride efficiently catalyzes the protection of a variety of aldehydes and ketones RC(O)R¹ (R = Ph, 4-butylphenyl, pyridin-2-yl, octyl, etc.; R¹ = H, Me, Et), including benzophenone, acetophenone, and cyclohexanone, to the corresponding di-Me acetals and 1,3-dioxolanes, RC(OR²)₂R¹ (R² = Me, -(CH₂)₂-) under microwave heating. Substrates possessing acid-labile protecting groups (TBDPS and Boc) chemoselectively generated the corresponding acetal/ketal in excellent yields.Dimethoxydiphenylmethane (cas: 2235-01-0) were involved in the experimental procedure.

Dimethoxydiphenylmethane is one of ethers-buliding-blocks. Ethers feature bent C–O–C linkages. In dimethyl ether, the bond angle is 111° and C–O distances are 141 pm. The barrier to rotation about the C–O bonds is low. Electric Literature of C15H16O2 The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp3.

Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Ray, Ritwika;Chowdhury, Abhishek Dutta;Lahiri, Goutam Kumar published 《Efficient Iron-Catalyzed Acetal Formation from Styrene Derivatives》 in 2013. The article was appeared in 《ChemCatChem》. They have made some progress in their research.Recommanded Product: 2235-01-0 The article mentions the following:

An efficient and direct catalytic transformation of styrenes into the corresponding arylaldehyde di-Me acetals under mild and benign reaction conditions by using FeS0₄*7H₂O as the catalyst, pyridine-2-carboxylic acid (pic) as the co-ligand, and H₂O₂ as the oxidant in methanol is presented. The experimental procedure involved many compounds, such as Dimethoxydiphenylmethane (cas: 2235-01-0) .

Dimethoxydiphenylmethane is one of ethers-buliding-blocks. Ethers feature bent C–O–C linkages. In dimethyl ether, the bond angle is 111° and C–O distances are 141 pm. The barrier to rotation about the C–O bonds is low. Recommanded Product: 2235-01-0 The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp3.

Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Product Details of 2657-87-6《Structures and properties of closed-cell polyimide rigid foams》 was published in 2013. The authors were Wang, Leilei;Hu, Aijun;Fan, Lin;Yang, Shiyong, and the article was included in《Journal of Applied Polymer Science》. The author mentioned the following in the article:

Closed-cell polyimide rigid foams with different Calculated Mol. Weight (Calc’d Mn) and foam d. (ρ) have been prepared by thermal foaming of nadimide-endcapped imideoligomers (NAIO) powder. The NAIO powder was obtained by thermally treating of a PMR poly(amide ester) solution derived from the reaction of di-Et ester of 2,3,3′,4′-biphenyltetracarboxylic dianhydride (α-BPDE) and p-phenylenediamine (p-PDA) using monoethyl ester of cis-5-norbornene- endo-2,3-dicarboxylic acid (NE) as reactive endcapping agent in Et alc. Effect of Calc’d Mn and foam d. (ρ) on mech. and thermal properties of the polyimide rigid foams have been systematically investigated. It was found that the thermal foaming properties of NAIO powders were affected by the Calc’d Mn. The appreciate Calc’d Mn could yield polyimide foams with both high closed-cell content (Cc) (>80%) and outstanding mech. properties. Moreover, the thermal properties were reduced by increasing of Calc’d Mn and the mech. properties improved gradually by increasing foam densities. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013.3-(4-Aminophenoxy)aniline (cas: 2657-87-6) were involved in the experimental procedure.

3-(4-Aminophenoxy)aniline is one of ethers-buliding-blocks. Ethers feature bent C–O–C linkages. In dimethyl ether, the bond angle is 111° and C–O distances are 141 pm. The barrier to rotation about the C–O bonds is low. Product Details of 2657-87-6 The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp3.

Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Wang, Qihua;Bai, Yongkang;Chen, Yu;Ju, Junping;Zheng, Fei;Wang, Tingmei published 《High performance shape memory polyimides based on π-π interactions》 in 2015. The article was appeared in 《Journal of Materials Chemistry A: Materials for Energy and Sustainability》. They have made some progress in their research.Safety of 3-(4-Aminophenoxy)aniline The article mentions the following:

A series of polyimides (PIs) with different chain structures were synthesized by a two-step method. The influences of chain conformations on their thermal and mech. properties were investigated by dynamic mech. anal., thermogravimetric anal., as well as by a universal testing machine. All PIs exhibited high glass transition temperature (>240 °C) and thermal decomposition temperature (>480 °C). Moreover, all these PIs could show shape memory properties more or less, especially ODA-BPDA with a shape recovery ratio (R_r) greater than 93%. The high value of R_r was mainly due to the existence of π-π interaction, a type of non-covalent interaction. The dependence of R_r on π-π interaction was investigated in detail by UV-vis spectroscopy. Finally, at. oxygen (AO) exposure experiments showed that the shape memory properties of ODA-BPDA were affected little by the erosion due to AO. To complete the study, the researchers used 3-(4-Aminophenoxy)aniline (cas: 2657-87-6) .

3-(4-Aminophenoxy)aniline is one of ethers-buliding-blocks. Ethers feature bent C–O–C linkages. In dimethyl ether, the bond angle is 111° and C–O distances are 141 pm. The barrier to rotation about the C–O bonds is low. Safety of 3-(4-Aminophenoxy)aniline The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp3.

Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Quality Control of Dimethoxydiphenylmethane《Direct Transformation of Silica from Natural Resources to Form Tetramethoxysilane》 was published in 2020. The authors were Putro, Wahyu S.;Fukaya, Keisuke;Choi, Jun-Chul;Choi, Seong Jib;Horikoshi, Toshio;Sato, Kazuhiko;Fukaya, Norihisa, and the article was included in《Bulletin of the Chemical Society of Japan》. The author mentioned the following in the article:

A simple and practical method for direct synthesis of tetramethoxysilane (TMOS) from silica (SiO₂) and methanol was achieved using a base catalyst and acetal as a dehydrant under carbon dioxide (CO₂). The production of TMOS was strongly influenced by the kind of the acetal used, with 2,2-dimethoxypropane identified as the most effective dehydrant. Authors observed that the acetal used enabled the production of a high yield of di-Me carbonate (DMC), which promoted the TMOS production DMC is an intermediate product from the reaction of CO₂ and methanol, which supported the SiO2 depolymerization process. When the reaction is conducted with 2,2-dimethoxypropane at 260° for 24 h, TMOS can be produced in up to 59% yield. For practical applications, the TMOS synthesis has been developed on a 250 mL and 1 L-scale reaction with constant yield (>50%) from various silica resources. The experimental procedure involved many compounds, such as Dimethoxydiphenylmethane (cas: 2235-01-0) .

The unique properties of ethers (i.e., that they are strongly polar, with nonbonding electron pairs but no hydroxyl group) enhance the formation and use of many reagents. For example, Grignard reagents cannot form unless an ether is present to share its lone pair of electrons with the magnesium atom.Quality Control of Dimethoxydiphenylmethane

Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Zhou, Haoran;Yu, Weimiao;Qu, Chunyan;Liu, Changwei;Wang, Dezhi published 《Facile one-step synthesis of PI/Fe₃O₄ composite microspheres from poly(amic acid) triethylamine salts and Fe(III) ion》 in 2015. The article was appeared in 《Journal of Materials Science: Materials in Electronics》. They have made some progress in their research.Synthetic Route of C12H12N2O The article mentions the following:

Polyimide/magnetite composite microspheres were successfully prepared from poly(amic acid) triethylamine salts and Fe(III) ion via a simple one-step solvothermal process. The formation mechanism of the composite microspheres was explored. The morphol. and the structure of the samples were characterized. It was found that polyimide has successfully coated on the surface of the magnetite microspheres and penetrated throughout the crystals via an assembly process. And the magnetic and thermal properties were measured, the results showing that composite microspheres have excellent thermal stabilities and the saturation magnetization is 35.29 emu/g with PI content of 60 wt%.3-(4-Aminophenoxy)aniline (cas: 2657-87-6) were involved in the experimental procedure.

3-(4-Aminophenoxy)aniline is one of ethers-buliding-blocks. Ethers lack the hydroxyl groups of alcohols. Without the strongly polarized O―H bond, ether molecules cannot engage in hydrogen bonding with each other. Synthetic Route of C12H12N2OEthers do have nonbonding electron pairs on their oxygen atoms, however, and they can form hydrogen bonds with other molecules (alcohols, amines, etc.) that have O―H or N―H bonds.

Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem