Zahra, Manzar;Zulfiqar, Sonia;Skene, William G.;Sarwar, Muhammad Ilyas published 《Crosslinking of polyamides using dianhydrides, diacid chloride and dialdehyde: a promising approach for water treatment》 in 2020. The article was appeared in 《Polymer International》. They have made some progress in their research.Name: 5,5′-((Propane-2,2-diylbis(4,1-phenylene))bis(oxy))bis(isobenzofuran-1,3-dione) The article mentions the following:
New crosslinked polyamides were successfully produced from the condensation of pre-synthesized monomer, 5-(2,2,2-trifluoroacetamido)isophthaloylchloride (TFAIAC) and diamines at low temperature These polyamides were used as promising metal-chelating adsorbents due to the presence of O and N donor sites on the crosslinked polyamides. For this purpose, trifluoroacetic anhydride was used to protect the amino group of 5-aminoisophthalic acid, thus generating 5-(2,2,2-trifluoroacetamido)isophthalic acid (TFAIA). TFAIA was converted into TFAIAC using oxalyl chloride, which was exploited as a suitable monomer for the synthesis of aromatic polyamides. Amino groups were then set free under basic conditions and the crosslinking was carried out through amino groups present on the polyamide chains with different dianhydrides, isophthaloyl chloride and 2,5-thiophenedicarboxaldehyde. The synthesis of monomers and polymers was confirmed by FTIR, 1H and 13C NMR spectroscopy and molar masses were measured by gel permeation chromatog. The crosslinked macromols. were found to possess enough chain alignment as depicted by their XRD patterns. The thermal stability of the crosslinked polyamides was increased as their decomposition temperatures were improved from 420 to 619 °C. Metal ion uptake was scrutinized through at. absorption spectroscopy with 83%-85% adsorption capacity at optimized parameters. The mechanism of adsorption was further investigated through the Freundlich and Langmuir adsorption isotherms. 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.Name: 5,5′-((Propane-2,2-diylbis(4,1-phenylene))bis(oxy))bis(isobenzofuran-1,3-dione) It is majorly used in novalac based resins, which can be further cured with bismaleimides (BMI) for aerospace, electronics and wireless communication based applications.