Control of Microphase Separation of Polystyrene-Silica Nanocomposites by Using Perhydropolysilazane and Partially Epoxidized Poly(styrene-block-butadiene-block-styrene) |
| |
| Authors: | Reiko Saito Toshifumi Kanahara Masahiro Oguchi Hiroshi Nakaseko |
| |
| Institution: | 1. Department of Organic and Polymeric Materials , Tokyo Institute of Technology , 2-12-1-E4-7, Ookayama Meguro , Tokyo , 152-8552 , Japan;2. Academy of Co-creative Education of Environment and Energy Science , Tokyo Institute of Technology , 2-12-1, Ookayama Meguro , Tokyo , 152-8552 , Japan;3. Department of Organic and Polymeric Materials , Tokyo Institute of Technology , 2-12-1-E4-7, Ookayama Meguro , Tokyo , 152-8552 , Japan;4. Academy of Co-creative Education of Environment and Energy Science , Tokyo Institute of Technology , 2-12-1, Ookayama Meguro , Tokyo , 152-8552 , Japan |
| |
| Abstract: | In order to control microphase separation of polystyrene-silica nanocomposites, perhydropolysilazane (PHPS), which is a preceramic of silica, and epoxidized poly(styrene-block-butadiene-block-styrene) triblock copolymer E-SBS, Mw = 8.0 × 104, styrene: 40 mol%, degree of epoxidization of butadiene: 20 mol%] or poly(styrene-block-butadiene-block-styrene) triblock copolymer SBS, Mw = 1.40 × 105, styrene: 30 mol%] as templates of microphase separation were blended, following the calcination of composites in steam at 60°C. Well-arranged microphase separation was formed with E-SBS, though the macrophase separation was formed with SBS. The morphology of the microphase separation of the composites with E-SBS and PHPS was widely controlled by varying the PHPS content based on Molau's law. Silica domains were formed in polybutadiene domains. NMR analysis indicated the interaction between silanyl group of PHPS and epoxy group in E-SBS. The composites on the substrate were highly transparent and the surface of the composite with 73.5 vol% of silica was harder than 4H. |
| |
| Keywords: | Polystyrene silica nanocomposite microphase separation perhydropolysilazane |
|
|
