Abstract: ZnS/bacterial cellulose/epoxy resin (ZnS/BC/E56) nanocomposites with good transparency and flexibility were prepared and characterized. When the precursor Zn²⁺concentrations were not more than 1?wt%, the size of the introduced ZnS nanoparticles was smaller than 50?nm and the distribution was homogeneous within the composites. Under the condition, outstanding transmittance more than 70% in the visible light was obtained. By incorporation of ZnS nanoparticles with excellent thermo-optic stability to the composites, the thermo-optic coefficient was obviously increased from -361?×?10^-6 to -310?×?10^-6?K^-1. The good flexibility, optical and mechanical properties endow the nanocomposites potential applications in the flexible optoelectronic materials.

Key words: ZnS, Bacterial cellulose, Epoxy resin, Nanocomposites, Properties