Papers by Author: De Sun

Abstract: Fumed Silica was modified with hexamethyldisiazane (HMDZ, modifier) and dimethyldiethoxysilane (DMDEOS, co-modifier) by grafting method. The structure of organo-functionnalized nanoparticles was characterized by fourier transform infrared spectrum (FT-IR) and transmission electron microscopy (TEM). Functional nanosilica-filled polydimethylsiloxane(PDMS) composites membrane were prepared. Scanning electron microscopy (SEM) observations of composites revealed good dispersion of the silica nanoparticles and the pervaporation performance of the filled PDMS membranes is better than that of the unfilled PDMS membranes.

Abstract: The degradation reaction of cellulose under the condition of microwave irradiation in an acidic aqueous medium including H2O2 has been investigated. The main factors, the solution acidity, reaction temperature and time, can have an effect on the cellulose degradation. The cellulose oxidative degradable polymerization was associated mainly with the action of releasing from H₂O₂. The scheme reflecting the main pathways of cellulose degradation in the reaction system of HCl/ H₂O₂ is proposed. A comparative study was investigated to evaluate the effects of microwave and conventional heating on cellulose degradation.