Bujak, Karolina;Nocon, Klaudia;Jankowski, Andrzej;Wolinska-Grabczyk, Aleksandra;Schab-Balcerzak, Ewa;Janeczek, Henryk;Konieczkowska, Jolanta published 《Azopolymers with imide structures as light-switchable membranes in controlled gas separation》 in 2019. The article was appeared in 《European Polymer Journal》. They have made some progress in their research.Synthetic Route of C31H20O8 The article mentions the following:
In the paper, we demonstrate a series of azobenzene polyimides with azomoieties located in the main chain for potential applications as membranes for controlled gas separation Since azobenzene derivatives can exist in two forms, i.e., thermodynamically stable trans and photoinduced cis, both isomers can be utilized for membrane preparation The long term stability of the cis form is a precondition for such an application. Thus, the effect of polymer structure on the stability of cis-trans isomerization process in polymer films was investigated. The prepared azopolymers exhibited high stability of cis isomers and the return cis-trans reaction was not completed during 7 days after switching off the excitation light (405 nm). The stability of the cis-trans isomerization was discussed in the context of the fragility parameter. To the best of our knowledge, it is the first time when the main chain azopolymer was tested as a membrane for the gas separation Two types of azomembranes, i.e., bearing azobenzene derivatives as trans, and cis isomers and a reference membrane without azochromophore were prepared Our investigations showed that the presence of trans-azomoieties increases the permeability of the gases (N2, O2, He and CO2) in comparison to the reference polyimide and that the permeability increase is not accompanied by any losses of the selectivity.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.Synthetic Route of 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