A novel dianhydride, 3,3 0 -dioxo-[1,1 0 ]-spirodiphthalan-5,5 0 ,6,6 0 -tetracarboxylic dianhydride, was synthesized and used as a monomer to prepare polyimides with several diamines via a conventional two-stage procedure. The intermediate poly(amic-acid)s had inherent viscosities of 0.84–1.71 dL/g and could be thermally converted into lightly yellow, transparent, flexible and tough films. Films cast from chemically imidized polyimides were transparent and colorless. The glass transition temperatures (Tg) were > 400°C, and the 5% weight-loss temperatures were > 420°C in N2 and in air. The solubilities of these polyimides in various solvents were evaluated. The mechanical properties of some polyimides were also tested.
Посилання на статтю:
Polyimides from 3,3 0 -dioxo-[1,1 0 ]-spirodiphthalan-5,5 0 ,6,6 0 tetracarboxylic dianhydride 1 / Fushe Han, Mengxian Ding, Lianxun Gao // Polymer. – 1999. – N 40. – P. 3809–3813.