Blended hybrids based on silsesquioxane–OH and epoxy resins |
| |
| Authors: | Tingli Lu Guozheng Liang Yaoli Peng Tao Chen |
| |
| Affiliation: | 1. Faculty of Life Science, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, People's Republic of China;2. School of Material Engineering, Soochow University, Suzhou, Jiangsu 215006, People's Republic of China;3. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu 221008, People's Republic of China |
| |
| Abstract: | Blended hybrids based on silsesquioxane cyclohexyl trisilanol STOH; i.e., (c‐C6H11)7Si7O9(OH)3] and epoxy resin 4,5‐epoxyhexyl‐1,2‐dimethyl acid diglycidyl ester (TDE‐85) were prepared with good compatibility of STOH up to 5 wt % with TDE‐85. The blended hybrid resins, with various STOH additions, were cured by 4,4′‐diaminodiphenylsulfone, and the curing reactions were investigated with differential scanning calorimetry. The incorporation of STOH increased the curing reaction of TDE‐85 for three active hydrogens existing in the STOH molecule. The storage moduli and glass‐transition temperatures of the cured hybrid resins were studied with dynamic mechanical analysis. The cured hybrids had higher storage moduli than the pure epoxy resins at lower temperatures and increased slightly even when the temperature was above the glass‐transition temperature. Two peaks appearing in tan δ curves indicated the block copolymer structure and two different glass‐transition temperatures of the cured hybrid resins. The thermal stability and flame retardancy of the cured hybrid resins were investigated with thermogravimetric analysis and limited oxygen index values, respectively. The results showed that introducing silsesquioxane–OH units into epoxy resins could improve the thermal stability and flame retardancy of the resins. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007 |
| |
| Keywords: | blends flame retardance resins thermal properties |
|
|
