ie6b04946_si_001.pdf (809.35 kB)
Structure Manipulation in Triptycene-Based Polyimides through Main Chain Geometry Variation and Its Effect on Gas Transport Properties
journal contribution
posted on 2017-01-30, 00:00 authored by Jennifer
R. Weidman, Shuangjiang Luo, Qinnan Zhang, Ruilan GuoTwo new triptycene-based polyimides,
6FDA-1,4-trip_ortho and 6FDA-2,6-trip_para, were synthesized to investigate
the effect of varying polymer backbone geometry on chain packing and
gas transport properties. Changing the imide linkage geometry from para to ortho reduced gas permeabilities
by ∼48% due to more efficient chain packing of the asymmetric ortho structure, which is demonstrated by decreased d-spacing and fractional free volume. Varying the triptycene
orientation from the 1,4- to 2,6-connection also caused a decrease
in permeability (e.g., 29% decrease for PCO2). This is likely the result of reduced chain mobility, as evidenced
by increased Tg, and a shift in free volume
distribution toward smaller cavities, as supported by smaller d-spacing. Physical aging studies show that the equilibrium
specific volume of these isomeric polymers is similar, as evidenced
by nearly identical gas transport properties exhibited by all aged
samples.
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FDAisomeric polymersGas Transport PropertiesP CO 2triptycene-based polyimidesortho structuregas transport propertiesimide linkage geometryspacingMain Chain Geometry Variationparapolymer backbone geometrychain mobilityStructure Manipulationstudies showTriptycene-Based Polyimidestriptycene orientationvolume distributionT ggas permeabilities
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