Category: 2657-87-6

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

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

Recommanded Product: 2657-87-6In 2016, Meng, Xiangsheng;Zheng, Yan;Yan, Jingling;Li, Yunhui;Wang, Zhen;Li, Guodong published 《2,3,3′,4′-Oxydiphthalic dianhydride-based phenylethynyl-terminated imide oligomers for low-temperature resin transfer molding applications》. 《High Performance Polymers》published the findings. The article contains the following contents:

A series of imide resins were prepared using 2,3,3′,4′-oxydiphthalic dianhydride, 4-phenylethynylphthalic anhydride, and aromatic diamines (1,3-bis(3-aminophenoxy), 3,4′-oxyaniline, 2,2′-bis(trifluoromethyl)benzidine, and m-phenylenediamine) as starting materials. These imide oligomers were characterized by means of Fourier transform IR spectroscopy, differential scanning calorimetry, intrinsic viscosity measurements, and rheol. measurements. Some of these oligomers exhibited low (<1 Pa.s at 250°C) and stable (>2 h at 250°C) melt viscosity, which was highly desirable for resin transfer molding process. Thermosetting polyimides (PIs) were then produced from these oligomers via thermal crosslinking reaction of phenylethynyl group. The properties of the thermosets were studied using tensile and flexural testing, dynamic mech. thermal anal., and thermogravimetric anal. The cured PIs exhibited a good combination of thermal and mech. properties, with a tensile strength of 31-76 MPa, flexural strength of 38-142 MPa, glass transition temperatures of 233-358°C, and 5% weight loss temperatures of 540-545°C under nitrogen atm. And 3-(4-Aminophenoxy)aniline (cas: 2657-87-6) was used in the research process.

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. Recommanded Product: 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

Tsai, Mei-Hui;Tseng, I-Hsiang;Liao, Yu-Fu;Chiang, Jen-Chi published 《Transparent polyimide nanocomposites with improved moisture barrier using graphene》 in 2013. The article was appeared in 《Polymer International》. They have made some progress in their research.Recommanded Product: 2657-87-6 The article mentions the following:

A facile technique was developed to improve the water barrier properties of transparent polyimide (PI) films. Transparent and organo-soluble PI films were synthesized from an alicyclic tetracarboxylic dianhydride (bicyclo[2.2.2]oct-7-ene-2,3,5,6-tetracarboxylic dianhydride) and an aromatic diamine (3,4′-oxydianiline) in a co-solvent of dimethylacetamide (DMAc) and γ-butyrolactone via a one-step process. Thermally reduced graphene (RG) was then blended with the PI in DMAc solution to fabricate PI/RG nanocomposite films without the addition of coupling agent. With the incorporation of only 0.1 wt% highly exfoliated RG in the PI matrix, the resultant PI/RG-0.1 nanocomposite exhibited a superior barrier to moisture and retained high transmittance in the visible light region. The surface of PI/RG was more hydrophobic than that of pure PI and simultaneously the water vapor transmission rate was significantly reduced to 13 g m-2 day-1 for the PI/RG-0.1 nanocomposite compared to 181 g m-2 day-1 for pure PI. Notably, the PI/RG-0.1 nanocomposite also exhibited favorable thermal stability with a lower coefficient of thermal expansion and a higher thermal degradation temperature compared to pure PI. The easy processing of PI solution and RG nanosheets, the good orientation of RG in PI and the excellent barrier and thermal properties of PI/RG make the transparent PI nanocomposite films potential substrate materials in flexible electronic applications. The experimental procedure involved many compounds, such as 3-(4-Aminophenoxy)aniline (cas: 2657-87-6) .

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. Recommanded Product: 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

Related Products of 2657-87-6《Efficient aramid fiber monomerization using alkaline subcritical water》 was published in 2021. The authors were Okajima, Idzumi;Okamoto, Hayato;Sako, Takeshi, and the article was included in《Polymer Degradation and Stability》. The author mentioned the following in the article:

To establish the chem. recycling of copoly(p-phenylene-3,4′-oxydiphenylene terephthalamide) fibers (i.e., Technora), their hydrolysis in pure supercritical, pure subcritical, and alk. subcritical water was investigated, and an efficient purification method to recover the constituent monomers in high yields and > 99% purity was developed. Technora hydrolysis in pure supercritical water required high temperatures, thus leading to monomer degradation and hence low monomer yields. Similarly, Technora hydrolysis to monomers was incomplete in pure subcritical water, which also resulted in low monomer yields. In contrast, the addition of NaOH to subcritical water promoted fiber decomposition, rendered hydrolysis irreversible, and prevented degradation of the produced monomers by allowing the reaction to proceed at lower temperature Thus, when subcritical water containing 10 equiv of NaOH per Technora unit was used at 250°C and 4 MPa for 3 h, the fibers decomposed with 100% efficiency, and the monomers were recovered in 88-99% yields. The rate of Technora hydrolysis in a neutral medium of either pure supercritical or subcritical water was represented well using the cylindrical-surface reaction model. This model was adjusted to describe the reaction in an alk. medium, i.e., subcritical water containing NaOH, by considering the decrease in both NaOH concentration and Technora surface area.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. Related Products of 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

Seung Kwon, Young;Lee, Ji-Su;Hwang, Gyu-Hyun;Gyu Jeong, Young published 《Structural, Optical and Thermal Characterization of Wholly Aromatic Poly(ether amide)s Synthesized by Phosphorylation-Based Condensation Polymerization》 in 2020. The article was appeared in 《ChemistrySelect》. They have made some progress in their research.SDS of cas: 2657-87-6 The article mentions the following:

To attain high performance polyamides with good thermal properties and enhanced processability, in this study, a series of wholly aromatic poly(ether amides) (PEAs) with different meta- and para-phenylene linkage ratios was synthesized by phosphorylation-based polycondensation reaction of terephthalic acid (TPA) and/or isophthalic acid (IPA) with 3,4′-oxydianiline (ODA) in NMP/CaCl2 solvent system. The synthesized PEA homopolymers and copolymers exhibited good solubility in organic polar solvents, such as NMP, DMAc and DMSO. The intrinsic viscosity of the synthesized PEAs in NMP solvent was measured to be in the range of 0.48-0.97 dL/g. The ¹H NMR analyses confirmed that the output compositions of PEA copolymers were quite consistent with the feed compositions The photog. digital images and UV-visible spectra showed that solution-casted PEA films were optically light brown and transparent owing to their amorphous and nonlinear chain structures. The DSC data revealed that the glass transition temperatures of PEAs are in the range of 242-310°C, depending on the relative contents of meta- and para-phenylene linkages. All PEA films were characterized to be thermally stable up to ∼400°C and to have high char residues above 63% at 800°C in nitrogen atm. And 3-(4-Aminophenoxy)aniline (cas: 2657-87-6) was used in the research process.

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. SDS of cas: 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

Hasegawa, Masatoshi;Hori, Atsushi;Hosaka, Chisato;Ishii, Junichi published 《Poly(ester imide)s with low coefficients of thermal expansion ( CTEs ) and low water absorption ( VI ): an attempt to reduce the modulus while maintaining low CTEs and other desired properties》 in . The article was appeared in 《Polymer International》. They have made some progress in their research.SDS of cas: 2657-87-6 The article mentions the following:

Here, a challenging target in the development of high-temperature dielec. substrates was established: to significantly reduce the modulus of dielec. substrates while maintaining their low coefficients of thermal expansion (CTEs) and other desired properties, to suppress the spring-back force, which is generated in folded flexible printed circuit boards. An ester-linked tetracarboxylic dianhydride with an asym. and longitudinally extended structure (TA-HPBAHQ) exhibited good polymerizability with various aromatic diamines and led to the formation of poly(ester imide) (PEsI) precursors with sufficiently high mol. weights The thermally imidized TA-HPBAHQ-based PEsI films obtained using rigid diamines exhibited a very high glass transition temperature (T_g), ultralow CTE, suppressed water uptake and an extremely low coefficient of humidity (hygroscopic) expansion. In particular, the combination of TA-HPBAHQ and m-tolidine significantly lowered the modulus and improved the film ductility while maintaining a low CTE close to that of copper foil with other desired properties. In addition, a TA-HPBAHQ analog, TA-HNAHQ, containing a 2,6-naphthalene unit, was used. TA-HNAHQ-based PEsIs exhibited a further decreased modulus and other excellent properties similar to those of the TA-HPBAHQ-based systems except for the appearance of a β-transition in certain cases, depending on the diamines used. Certain selected PEsIs exhibited an extremely low tan δ at 10 GHz and a relatively good or the highest rank of flame retardancy. Thus, certain PEsIs examined in this study are promising candidates as new dielec. substrates required to exhibit a low CTE, suppressed modulus and other target properties for use in next-generation flexible printed circuit boards. 2022 Society of Industrial Chem. 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. SDS of cas: 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

Smotrina, T. V.;Smotrin, V. A.;Stoyanov, O. V. published 《Molecular mobility and proton magnetic relaxation processes in water-polymer system》 in 2014. The article was appeared in 《Vestnik Kazanskogo Tekhnologicheskogo Universiteta》. They have made some progress in their research.Safety of 3-(4-Aminophenoxy)aniline The article mentions the following:

The processes of proton magnetic relaxation in hydrated polymers were studied. It is established that in the presence of water spin-lattice relaxation in rigid-chain polymers that do not contain moving side substituents (for example, aromatic polyamides), is carried out mainly through a phase of sorbed water mols. which act as addnl. relaxation. For hydrated polysaccharides containing movable oxymethylene group, and flexible-chain aliphatic polyamides (example capron) a significant contribution to the processes of spin-lattice relaxation make mol. motion activated their amorphous phase, which gave the opportunity for these polymers to register, resp., the – and the-relaxation transitions. 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 lack the hydroxyl groups of alcohols. Without the strongly polarized O―H bond, ether molecules cannot engage in hydrogen bonding with each other. Safety 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

Meng, Xiangsheng;Yan, Jingling;Fan, Weifeng;Liu, Jingfeng;Wang, Zhen;Li, Guodong published 《Thermosetting polyimides and composites based on highly soluble phenylethynyl-terminated isoimide oligomers》 in 2014. The article was appeared in 《RSC Advances》. They have made some progress in their research.Application of 2657-87-6 The article mentions the following:

Highly soluble phenylethynyl-endcapped isoimide oligomers were synthesized using 2,3,3′,4′-biphenyltetracarboxylic dianhydride and aromatic diamines as the monomers, 4-phenylethynyl phthalic anhydride as the end-capping reagent, and trifluoroacetic anhydride as the dehydrating agent; then high performance thermosetting polyimides and composites were produced from these oligomers via the thermal crosslinking reaction of the phenylethylnyl group and the material properties were fully investigated. A series of isoimide oligomers with different mol. weights and a variety of chem. architectures were prepared by polycondensation of 3,4′-BPDA, 4-PEPA, and aromatic diamines including m-phenylenediamine (m-PDA), 2,2′-bis(trifluoromethyl)benzidine and 3,4′-oxydianiline followed by cyclization with trifluoroacetic anhydride. Compared to their imide analogs, isoimide oligomers showed much higher solubility in low b.p. solvents, and slightly lower melt viscosity, which can be attributed to their unique asym. architecture. These resins were formulated into thermosetting polyimides and composites by thermal crosslinking of the phenylethynyl group and conversion from isoimide to imide at elevated temperatures The properties of the thermosets and composites were studied using mech. property measurements, dynamic mech. thermal anal. and thermogravimetric anal. The polyimide/quartz fiber composites possessed excellent high temperature mech. properties due to the high glass transition temperatures of matrix resins. And 3-(4-Aminophenoxy)aniline (cas: 2657-87-6) was used in the research process.

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. Application of 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

Wang, Wei;Wang, Zijun;Zhang, Li;Liu, Yuntao;Chen, Dongfeng published 《Effect of isomeric oxydianiline on crystalline behavior and properties of semicrystalline copolyimides》 in 2014. The article was appeared in 《Gaofenzi Cailiao Kexue Yu Gongcheng》. They have made some progress in their research.Related Products of 2657-87-6 The article mentions the following:

To investigate the effect of isomer on crystallinities of copolyimides, two copolyimides were synthesized by introducing 4,4′-oxydianiline (4,4′-ODA) or 3,4′-oxydianiline (3,4′-ODA) to 3,3′,4,4′-biphenyltetracarboxylic dianhydride (s-BPDA)/1,3-bis (4-aminophenoxy) benzene (TPER). And the mole ratio of ODA and TPER is both 1:9. The homopolyimide based on s-BPDA/TPER/phthalic anhydride (PA) was also prepared and it was abbreviated as TPER PI. Copolyimide containing 4,4′-ODA or 3,4′-ODA was abbreviated as PI a and PI b, resp. TGA, DSC, DMA and WXRD were used to study the crystalline behaviors and properties of the polymers. Three polymers display different cold crystallization temperatures and melting temperatures after being quenched from melts by DSC and they also display different melting behaviors after being slowly cooled from melts. Since 3,4′-ODA has more twisted structure, PI b displays the lowest melting temperature (T_m), the lowest crystallization rate, and the lowest storage modulus above T_g. After being isothermally crystallized at different temperatures for 1 h, PI a displays a triple-melting behaviors as same as TPER PI, however, PI b displays a duple-melting behaviors. Positions of some diffraction peaks of PI b were found to be changed after being isothermally crystallized at different temperatures In a word, introduction of 4,4′-ODA and 3,4′-ODA greatly affects crystalline behaviors of the copolyimides.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. Related Products 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