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The dielectric function of interstellar dust material is modeled usingobservations of extinction and polarization in the infrared, together withestimates for the mass of interstellar dust. The "astrodust" material isassumed to be a mix of amorphous silicates and other materials, includinghydrocarbons producing an absorption feature at 3.4$\mu$m. The detailed shapeof the 10$\mu$m polarization profile depends on the assumed porosity and grainshape, but the 10$\mu$m spectropolarimetric data are not yet good enough toclearly favor one shape over another, nor to constrain the porosity. Theexpected 3.4$\mu$m feature polarization is consistent with existing upperlimits, provided the 3.4$\mu$m absorption is preferentially located in grainsurface layers; a separate population of non-aligned carbonaceous grains is notrequired. We predict the 3.4$\mu$m polarization feature to be $(\Deltap)_{3.4\mu{\rm m}}/p(10\mu{\rm m})\approx 0.016$, just below current upperlimits. Polarization by the same grains at submm wavelengths is alsocalculated.

The Dielectric Function of "Astrodust" and Predictions for Polarization in the 3.4$\mu$m and 10$\mu$m Features