Marvin L. Illingsworth, Huixiong Dai, Wei Wang, Derek Chow, Emilie J. Siochi, Kenwan Yang, Julie M. Leiston-Belanger and Jennifer Jankauskas
Using mellitic acid dianhydride (MADA) to prepare Zr-pendent co-polyimides is being evaluated as a means of increasing Zr concentration and atomic oxygen resistance. A structure-property study has been performed using PMDA and OPDA (dianhydrides) and 4,4′-ODA, 3,4′-ODA, and 1,3-APB (diamines) as starting materials, and holding the Zr concentration at 10% (mol). The spectroscopic data for all products are consistent with the expected structures. Zr-pendent and nonpendent co-polyamic acid precursors had intrinsic viscosities (η0) of 0.86–0.46 and 0.76–0.38 and weight average molecular weights (Mw) from GPC of 115,400–436,000 and 38,300–111,200 Da, respectively.