Synthesis and characterization of unsaturated polyester/carborundum composites

Abstract

Two unsaturated polyesters, one based on phthalic anhydride PE P and the other based on isophthalic acid PE I, were synthesized. The chemical structure of the two polyesters was characterized by IR and 1 H and 13 C NMR spectroscopy. The effect of styrene concentration on the curing of polyesters was also studied. It has been found that the percent of polyester/styrene (70/30 wt %) gave the highest percent of curing. Different concentrations of carborundum (0-70 wt %) were used to prepare polyester composites. A comparative study was done on the properties of the two prepared polyesters PE P and PE I and their composites in term of their thermal, mechanical, electrical, and physical properties. The results indicate that the polyester based on isophthalic acid (PE I ) and its composites gave higher compressive strength values and lower water absorption than those based on phthalic anhydride (PE P ). The presence of carborundum improved the thermal stability than the cured polyesters and electrical properties.

Nonvolatile Ternary Memristor Based on Fluorene-Benzimidazole Copolymer/Au NP Composites

“…Recent research trends demonstrate that RRAM (resistive random-access memory) with the simple electrode/active layer/electrode structure [ 4 ] shows excellent data storage performance [ 5 , 6 ] for nanoscale size, high storage density, fast wipe speed, low operating voltage, and excellent cycle stability, among others [ 7 , 8 ]. These devices typically used inorganic materials as active materials, such as oxide [ 9 , 10 , 11 , 12 ], carbides [ 13 , 14 , 15 ], nitrides [ 16 , 17 , 18 ], and so on. Inorganic materials, however, have reached their physical limits.…”