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 (Me), glass transition temperature (Tg), tensile strain-at-break, zero-shear melt viscosity, average hole-size free volume (Vh), 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 Me 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