The shifts observed in the 1:7 PVC-U complex are similar to those observed in the 1:3, 1:2, and 1:1.38 PVC-U complexes, though those with less urea exhibited even more significant shifts than the 1:7 PVC-U complex, indicating that all the U was complexed with PVC. Their FTIR spectra are found in Appendices B-D in the Supplementary Material and are summarized in Tables1-3. It is evident that PVC can successfully complex with U, and this was also reflected in the DSC thermograms of the various PVC:U complexes. After performing FTIR on the PVC-U complexed samples, they were examined by DSC. For comparison, pure PVC was first analyzed with DSC and its thermogram illustrated that the PVC used in our samples has a Tg between 85-88° C (Figure ). Next, we analyzed a physical molar mixture of 1:1.4 PVC:U. Its Tg dropped very little to 82° C. When 3 moles of U were solution processed and combined with 1 mole of PVC, this PVC:U complex's Tg dropped to 51° C. However, a 1:3 PVC:U physical mixture did not alter the Tg of PVC (Figure ).