Hyperbranched Polyimides Type III

Almost all hyperbranched polyimides with reported gas permeation parameters were synthesized from A2- and Bs-type monomers. The corresponding transport data are presented in Table 1.4 [20-26]. All the polymers are in a glassy state. The gas permeabilities of hyperbranched polyimides vary from 0.02 to 11 Barrer for O2 and from 0.08 to 65 Barrer for CO2 at 20-35 °C. The selectivities vary from 2.0 to 13 for a(02/N2) and from 3.4 to 70.1 for a(C02/N2). 

Polyimide Temperature (°C) Feed pressure (atm) Pip2) PiCO ) alOj/Nj) alCOj/Nj) a(C02/CH4) Reference 

PMDA/BTDA-3MPDA (8 2) linear (Type I) PMDA/BTDA-3MPDA (8 2) (2h) 

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Table 1.4 Cas permeability coefficients (Barter) and selectivity of hyperbranched polyimides (Type III)... 

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