Study On Preparation And Thermal Property Of New Organic/Inorganic Nanocomposites

Octa-vinyl polyhedral oligmeric silsesquioxane (POSS) was blended with polymethyl methacrylate (PMMA), polyacetoxystyrene (PAS) and polystyrene (PS), respectively, for preparing three new organic/inorganic nanocomposites. Their structures were characterized using FTIR and XRD, respectively. Thermal properties of the nanocomposites were determined using Differential scanning calorimetry (DSC) and thermogravimetric analysis thermograms (TGA). The enhancement mechanism of thermal property was investigated using FTIR spectra and XRD. The main contents of this dissertation consist of the following points:1. The recent improvement of organic/inorganic nanocomposites was reviewed. Polymer/POSS nanocomposites was summarized based on the synthesis methods, thermal property and enhancement mechanism of thermal property.2. Octa-vinyl polyhedral oligomeric silsesquioxane (POSS) was synthesized by hydrolyze-condensation method. PMMA, PAS and PS were synthesized by a conventional free radical polymerization technique under nitrogen using a vacuum-line system.3. Three Polymer/POSS nanocomposites were prepared using solution-blending method. Their structures were characterized by FTIR and XRD.4. Thermal properties of three Polymer/POSS nanocomposites were determined by DSC and TGA. The enhancement mechanism of thermal property was investigated by FTIR spectra and XRD, finding that Tg of the PMMA/POSS and PAS/POSS nanocomposites increase with POSS in low POSS content and reach the highest at POSS 0.84mol% and 0.48mol%, respectively, then, decrease with further increase of the POSS content owing to the aggregation of POSS. On the contrary, the Tg of PS/POSS nanocomposites deceases when POSS was added into PS due to the dilute role of POSS to PS.