Density Functional Theory Simulations: Two model systems using DFT simulations were preformed to model complementary aspects of TMA infiltration in PLA and PMMA. The first model, similar to that previously used for RuO4 infiltration in polystyrene and PMMA, is a non-periodic, gas phase model that uses an oligomer of ten monomers for each polymer, and standard DFT relaxations. The non-periodic DFT calculations were performed with the TURBOMOLE software using the PBE0 hybrid exchange-correlation functional with a split valence, def-SV(P), basis set, which provides reliable results for similar calculations. The self-consistent field (SCF) convergence criteria was 10 -6 Ha and the structures were relaxed until an energy convergence of 10 -3 Ha. IR vibrational modes were calculated using analytical force constants within the harmonic oscillator approximation.