Category: benzofurans

Yin, Lu-meng;Yang, Ming-wei;Liu, Quan;Li, Xiang;Zhang, Yan;Zhi, Xin-Xin;Qi, Hao-ran;Liu, Jin-gang;Lv, Feng-zhu published 《Electrospun Polyimide Ultrafine Non-woven Fibrous Membranes Containing Phenyl-substituted Quinoxaline Units with Improved Hydrolysis Resistance for Potential Applications in High-temperature Water Environments》 in 2022. The article was appeared in 《Fibers and Polymers》. They have made some progress in their research.COA of Formula: C31H20O8 The article mentions the following:

Two organo-soluble polyimide resins containing phenyl-substituted quinoxaline units (PIPQ) were successfully prepared via the two-step chem. imidization procedure from an aromatic diamine, 6(7)-amino-2-(4-aminophenyl)-3-phenylquinoxaline (PQDA) and aromatic dianhydrides with flexible mol. structures. The derived PIPQ-1 resin from PQDA and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and the PIPQ-2 resin from PQDA and 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride (BPADA) were all soluble in polar aprotic solvents, such as N-methyl-2-pyrrolidone (NMP) and N,N-dimethylacetamide (DMAc). The PIPQ/DMAc solutions with the solid contents of 25-35 wt% were used as the starting mediums and the PIPQ ultrafine non-woven fibrous membranes (UFMs) were successfully prepared by the one-step electrospinning (ES) procedure. The fabricated PIPQ UFMs exhibited good thermal stability with the 5% weight loss temperatures (T5%) of 537°C for PIPQ-1 (6FDA-PQDA) and 517°C for PIPQ-2 (BPADA-PQDA) in nitrogen, resp. In addition, the PIPQ UFMs exhibited glass transition temperatures (Tg) higher than 252°C. The PIPQ UFMs survived even during the aging in boiling aqueous sodium hydroxide solution (concentration: 20 wt%) for 3 h while the PI-ref UFM totally hydrolyzed during the test. And 5,5′-((Propane-2,2-diylbis(4,1-phenylene))bis(oxy))bis(isobenzofuran-1,3-dione) (cas: 38103-06-9) was used in the research process.

5,5′-((Propane-2,2-diylbis(4,1-phenylene))bis(oxy))bis(isobenzofuran-1,3-dione)(cas: 38103-06-9) is a diallyl based epoxy modification agent that blends with the resin to improve the mechanical property of the epoxy material.COA of Formula: C31H20O8 It is majorly used in novalac based resins, which can be further cured with bismaleimides (BMI) for aerospace, electronics and wireless communication based applications.

Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem

Wolfgang, Josh D.;Reynolds, Karina J.;Arrington, Clay B.;Odle, Roy R.;Nazarenko, Sergei I.;Long, Timothy E. published 《Influence of dianhydride regiochemistry on thermomechanical and rheological properties of 3,3′- and 4,4′-polyetherimides》 in 2021. The article was appeared in 《Polymer》. They have made some progress in their research.Application of 38103-06-9 The article mentions the following:

The design of linear high performance polyetherimides (PEIs) comprising 3,3′- and 4,4′-bisphenol-A dianhydride (bis-DA) and m-phenylene diamine (mPD) provided an opportunity to elucidate the influence of dianhydride regiochem. on thermomech. and rheol. properties. This unique pair of regioisomers allowed the tuning of the thermal and rheol. properties for high glass transition temperature polyimides for emerging engineering applications. Step-growth polycondensation enabled the production of high mol. weight PEIs for subsequent thermal and mech. anal. Monofunctional phthalic anhydride as an endcapper and monomeric stoichiometric imbalances enabled predictable number-average mol. weights ranging from 3600 to 35,400 g mol^-1, as confirmed with size exclusion chromatog. coupled with light scattering detection for absolute mol. weight determination The selection of the dianhydride regioisomer influenced the weight loss profile as a function of temperature, entanglement mol. weight (M_e), glass transition temperature (T_g), tensile strain-at-break, zero-shear melt viscosity, average hole-size free volume (V_h), and the plateau modulus prior to viscous flow during dynamic mech. anal. The 3,3′- PEI composition interestingly exhibited a ∼20°C higher glass transition temperature than the corresponding 4,4′- PEI analog. Moreover, melt rheol. anal. revealed a two-fold increase in M_e for 3,3′- PEI, which pointed to the origin of the differences in mech. and rheol. properties as a function of PEI backbone geometry. To complete the study, the researchers used 5,5′-((Propane-2,2-diylbis(4,1-phenylene))bis(oxy))bis(isobenzofuran-1,3-dione) (cas: 38103-06-9) .

5,5′-((Propane-2,2-diylbis(4,1-phenylene))bis(oxy))bis(isobenzofuran-1,3-dione)(cas: 38103-06-9) is a diallyl based epoxy modification agent that blends with the resin to improve the mechanical property of the epoxy material.Application of 38103-06-9 It is majorly used in novalac based resins, which can be further cured with bismaleimides (BMI) for aerospace, electronics and wireless communication based applications.

Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem

Wu, Yancheng;Ji, Jingqi;Huang, Haohao;Liu, Shumei;Zhao, Jianqing published 《Facile synthesis of acyloxy-containing fluorene-based Cardo polyimides with high optical transparency, fluorescence and low dielectric constant》. The research results were published in《Reactive & Functional Polymers》 in 2021.Recommanded Product: 38103-06-9 The article conveys some information:

A series of acyloxy-containing fluorene-based Cardo polyimides (PIs) were facilely synthesized by the post-polymerization modification based on a simple esterification of hydroxyl-containing PIs. Incorporation of acyloxy groups may reduce the packing d. of PI chains and weaken both inter- and intra-chain charge transfer complexes (CTC) formation. Accordingly, the modified PIs exhibit the improved solubility in low-boiling-point solvents and optical transparence. The optical transmittance at 400 nm (T₄₀₀) of all modified PI films is significantly increased to 80.1-83.5% from 41.6-54.5% of the precursor PI films. Meanwhile, the modified PI films exhibit a bright fluorescence. The modified PIs still display the superior heat resistance with a glass transition temperature (T_g) of 301.1-390.9°C as well as admirable mech. properties with a tensile strength (T_S) of 72.1-81.3 MPa. In addition, the dielec. constant (k) value at 1 MHz of the modified PI films is decreased to 2.58-2.90 from 3.95-4.48 of the precursor PI films, which is attributed to the enlarged free volume and reduced water absorption afforded by the incorporation of acyloxy groups. This work provides an efficient post-polymerization modification approach to simultaneously affording the multifunctional PI films with high T_g, high T₄₀₀ and low k, probably as the potential candidates for the practical application in display and microelectronic industries. The experimental procedure involved many compounds, such as 5,5′-((Propane-2,2-diylbis(4,1-phenylene))bis(oxy))bis(isobenzofuran-1,3-dione) (cas: 38103-06-9) .

5,5′-((Propane-2,2-diylbis(4,1-phenylene))bis(oxy))bis(isobenzofuran-1,3-dione)(cas: 38103-06-9) is a diallyl based epoxy modification agent that blends with the resin to improve the mechanical property of the epoxy material.Recommanded Product: 38103-06-9 It is majorly used in novalac based resins, which can be further cured with bismaleimides (BMI) for aerospace, electronics and wireless communication based applications.

Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem

Application of 38103-06-9《Polyimide Aerogel Fibers with Superior Flame Resistance, Strength, Hydrophobicity, and Flexibility Made via a Universal Sol-Gel Confined Transition Strategy》 was published in 2021. The authors were Li, Xin;Dong, Guoqing;Liu, Zengwei;Zhang, Xuetong, and the article was included in《ACS Nano》. The author mentioned the following in the article:

Aerogel fibers with ultrahigh porosity, large sp. surface area, and ultralow d. have shown increasing interest due to being considered as the next generation thermal insulation fibers. However, it is still a great challenge to fabricate arbitrary aerogel fibers via the traditional wet-spinning approach due to the obvious conflict between the static sol-gel transition of the aerogel bulks and the dynamic wet-spinning process of aerogel fibers. Herein, a sol-gel confined transition (SGCT) strategy was developed for fabricating various mesoporous aerogel fibers, in which the aerogel precursor solution was first driven by the surface tension into the capillary tubes, then the gel fibers were easily formed in the confined space after static sol-gel process, and finally the mesoporous aerogel fibers were obtained via the supercritical CO₂ drying process. As a typical case, the polyimide (PI) aerogel fiber prepared via the SGCT approach has exhibited a large sp. surface area (up to 364 m²/g), outstanding mech. property (with elastic modulus of 123 MPa), superior hydrophobicity (with contact angle of 153°), and excellent flexibility (with curvature radius of 200μm). Therefore, the aerogel woven fabric made from PI aerogel fibers has possessed an excellent thermal insulation performance in a wide temperature window, even under the harsh environment. Besides, arbitrary kinds of aerogel fibers, including organic aerogel fibers, inorganic aerogel fibers, and organic-inorganic hybrid aerogel fibers, have been fabricated successfully, suggesting the universality of the SGCT strategy, which not only provides a way for developing aerogel fibers with different components but also plays an irreplaceable role in promoting the upgrading of the fiber fields.5,5′-((Propane-2,2-diylbis(4,1-phenylene))bis(oxy))bis(isobenzofuran-1,3-dione) (cas: 38103-06-9) were involved in the experimental procedure.

5,5′-((Propane-2,2-diylbis(4,1-phenylene))bis(oxy))bis(isobenzofuran-1,3-dione)(cas: 38103-06-9) is a diallyl based epoxy modification agent that blends with the resin to improve the mechanical property of the epoxy material.Application of 38103-06-9 It is majorly used in novalac based resins, which can be further cured with bismaleimides (BMI) for aerospace, electronics and wireless communication based applications.

Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem