Phosphorylated polyimide

The work on phosphorylated polyimides carried out by Fohlen et al. (31) also appears to be very promising. For example, maleimide derivatives have been prepared from bis(m-aminophenyl) methyl phosphine oxide (I) and tri(m-aminophenyl) phosphine oxide (II). 

Synthesis of phosphorylated polyimide 23. A 20 mL vial was charged with diaminostilbene22 (0.3025 g, 0.589 mmol) and 1 g of dry NMP. The mixture was stirred until complete dissolution of diamine was achieved, followed by addition of 6-FDA (0.2616 g, 0.589 mmol) and 1 g of NMP. The mixture turned dark red in color, it was stirred for 48 h, yielding a daik red viscous polyamic acid solution PAA-2. 

In the final step of this strategy, the CT/NLO diamine 22 underwent polycondensation with 6-FDA, resulting in formation of phosphorylated polyimide 2 3 (Figure 10). The reaction was carefully monitored for color and viscosity changes, and chemical imidization was utilized to complete the imide bond formation. Polyimide 23 was obtained as dark brown solid, soluble in THF and DMF. The polymer had a broad absorption band with the maxima at 298 nm, ranging from 260 -476 nm. Polyimide 2 3 was vety stable up to 249 C, with a Tg observed at 167 C. This clearly indicates the possibility of long term stability and smble poled order. H NMR and elemental analysis unambiguously indicated formation of the desired polymer. In fact, other than the Tg, polyimides 21 and 2 3 were very similar. 

Phosphoms pentoxide-methanesulfonic acid (PPMA), 315 Phosphorylation, 187 Photoacid generator (PAG), 317 Photoluminescence, 490 Photosensitive polyimides, 270-271, 292 PHRRs. See Peak heat release rates (PHRRs)... 

FIGURE 9.28 Dependence of productivity for the mixture (o) and separation factor of benzene/cyclohexane j3p(x) on degree of phosphorylation for phosphorylated and thermally cross-linked BPDA-TrMPD polyimides henzene/cyclohexane, 50/50 wt% mixture, r=343 K, membrane thickness 30-40 p-m. (From analysis of data presented in Semenova, S.I., J. Membr. Sci., 231, 189, 2004. With permission.)... 

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