Synthesis and characterization of novel star-branched polyimides derived from 2,2-bis[4-(2,4-diaminophenoxy)phenyl]hexafluoropropane

Abstract

A series of novel star-branched fluorinated polyimides was synthesized from anhydride-terminated linear poly(amide acid)s and aromatic fluorinated tetramine BDAPFP.

The effects of long and bulky aromatic pendent groups with flexible linkages on the thermal, mechanical and electrical properties of the polyimides and their nanocomposites with functionalized silica

“…The same kind of polyimides with high intrinsic viscosity was reported by Wang et al 46 Similarly, star branched polyimides with high inherent viscosity were reported by Wu et al in 2017 and Liu et al in 2016. 47,48 The molecular weights of these PIs determined by GPC in DMF relative to polystyrene standards were in the range of 91 868–98 246 for M w and 42 868–44 542 for M n with M w / M n values of 2.1–2.2. 11,49 Polyimides show good film forming capacity and are creasable due to the formation of high molecular weight polymer.…”

Synthetic strategies for highly transparent and colorless polyimide film

“…Therefore, the introduction of CF 3 can effectively improve the transmittance of PI films. 64,95,96 Many studies have shown that the enhancement of transmittance is closely related to the system fluorine content. In the same PI system, the higher the fluorine content, the better its optical properties.…”

Synthesis and enhanced CO2/CH4 selectivity of hyperbranched copolyimide membranes

“…19 Thus, the third monomer diamine or dianhydride is overall incorporated to synthesize hyperbranched copolyimide (co-HBPI), as an attempt to improve the entanglement between the segments. 18,20,21 It is noteworthy that co-HBPIs containing triamine monomers have been extensively synthesized, whose gas selectivity is significantly enhanced as compared with that of pure linear polyimide. 22,23 As a result, the gel will be easier to form, and the reaction will fail when the synthesis of co-HBPIs achieves a certain conversion rate in comparison with those of diamine and dianhydride.…”