6FDA2,2'-Bis (3,4-Dicarboxyphenyl) Hexafluoropropane Dianhydride
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The monomers used in the synthesis, which include 6FDA (Daikin Industries), p-aminophenethyl alcohol (APA; Sigma-Aldrich Co.
The data for UV 0 min was used for 6FDA-TeMPD because the unirradiated 6FDA TeMPD-BEI (UV 0 min) was brittle.
Fluorinated Pis are in general transparent because electron conjugation is limited by the fluoroalkyl units in the 6FDA molecular main chain and the [CF.
We prepared and characterized colorless PI/SPT hybrid films using 6FDA and APS in DMAc.
NOMENCLATURE APS bis-(3-aminophenyl) sulfone DMAc N, N'-dimethylacelamide DSC differential scanning calorimeter 6FDA 4, 4'-(hexafluoroisopropylidene) diphlhalic anhydride [[lambda].
Samples Dianhydride Diamine mixture PI-1 BPDA 1,3,4-APB(75), 3,4'-ODA(25) PI-2 6FDA 1,3,4-APB(75), 3,4'-ODA(25) PI-3 ODPA 1,3,4-APB(75), 3,4'-ODA(25) PI-4 9FDA 1,3,4-APB(75), 3,4'-ODA(25) PI-5 BPDA 1,3,4-APB(50), 3,4'-ODA(50) PI-6 BPDA 1,3,4-APB PI-7 BPDA 1,3,4-APB(75), 3,4'-ODA(25) Samples Calculated [M.
The chemical shifts of protons in the 6FDA moiety are located at 8.
2], but the great change in local concentration of 6FDA moieties offsets the increase in gas diffusivity.
The thermoplastic fluoro-polyetherimides based on 6FDA and 4,4'-bis(4-amino phenoxyphenyl) sulfone (m-SED) [i.
For example, in the case of fluoro-polyetherimide, based on 6FDA and m-SED, (i.
The competition between flexible ODA moieties and rigid 6FDA sequences containing hex- afluoroisopropylidene groups--characterized by steric hindrances that can prohibit close packing of chains (44) leads to a maximum viscosity for poly(6FDA-ODA).
whereas the polymer based on 6FDA showed characteristic absorptions at 1192 1209 [cm.