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Abstract: A series of novel polyamides that carry carbazole-containing pendent was prepared by direct polycondensation of a diamine, N-(4-(carbazol-9-yl)phenyl)-3,5-diaminobenzamidamide (DAC), and various aliphatic and aromatic dicarboxylic acids. All the resulting polyamides were amorphous with inherent viscosities ranged from 0.51 to 0.65dL/g and were readily soluble in many organic solvents which could be solution-cast into transparent and tough films. The glass transition temperatures (Tg ) of these polymers were affected considerably by their chemical structure and ranged from 195 to 300°C. They had useful levels of thermal stability associated with relatively high temperatures of 10% weight loss (T 10) in the range of 385–480°C in nitrogen atmosphere. These polymers exhibited strong UV–vis absorption maxima in solution and in solid state, and their photo- and chemi-luminescence properties were studied. photoluminescence (PL) efficiency of the polyamides were affected by their chemical structure (PL quantum yield up to 32%). The aliphatic polyamides emitted blue light (λ e.max =435–450nm), while the aromatic polyamides emitted green light (λ e.max =485–492nm) both in solution and solid state. [Copyright &y& Elsevier]

Abstract: A series of novel fluorinated poly(aryl ether)s containing phthalazinone moieties (FPPEs) have been prepared by a modified synthetic procedure for optical waveguide applications. The obtained random copolymers exhibited excellent solubility in polar organic solvents, high glass transition temperatures (T gs: 185–269°C), good thermal stabilities (the temperatures of 1% weight loss: 487–510°C) and good optical properties. By adjusting the feed ratio of the reactants, the refractive indices of TE and TM modes (at 1550nm) could be well controlled in the range of 1.575–1.498 and 1.552–1.484, respectively. The optical losses of the FPPEs exhibited relatively low values (less than 0.27dB/cm at 1310nm). Additionally, the thermo-optic coefficient (dn/dT) values of the FPPEs at 1310nm and 1550nm (TE mode) ranged from −0.97×10−4 °C to −1.33×10−4 °C and from −0.96×10−4 °C to −1.29×10−4 °C, respectively. [Copyright &y& Elsevier]