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- [34] RIGID ROD POLYMERS WITH FLEXIBLE SIDE-CHAINS .4. SYNTHESIS, STRUCTURE AND PHASE-BEHAVIOR OF POLYIMIDES PREPARED FROM PYROMELLITIC ANHYDRIDE AND 2,5-DI-NORMAL-ALKOXY-1,4-PHENYLENE DIISOCYANTES MAKROMOLEKULARE CHEMIE-MACROMOLECULAR CHEMISTRY AND PHYSICS, 1987, 188 (12): : 2865 - 2873