Using conjugated system from natural sources for the synthesis of sulfur copolymers by bi-function catalysts at mild temperatures

摘要

Sulfur-rich polymers are promising materials to cover several applications including mercury capture adsorbents. Tung oil, a natural conjugated triene triglyceride oil, were selected to prepare sulfur-rich copolymers. The unique second monomer made reaching the gel point possible at a mild temperature of 130 degrees C in 2.5 h. The reaction accomplishment was confirmed by the depletion of double bonds in tung-oil-sulfur copolymers measured by H-1 NMR, FTIR, XRD, and DSC. A bi-function catalyst calcium hydroxide accelerates the reactions between triglyceride and sulfur before it is removed to increase the surface area and achieve the aims of preparing adsorbents, which has zero free sulfur, high crosslinking degree, and efficient mercury capture. Newly developed tung-oil-sulfur copolymers catalyzed by calcium hydroxide offer the possibility to synthesize sulfur-rich copolymers that combine the advantages of the high performance and the utility of greener and more environmental friendly raw materials.