Novel Preparation of Hybrid Polypropylene/Silica Nanocomposites in a Slurry-Phase Polymerization Reactor
| Autor: | M. Garcia, Günter Weickert, Makarand S. Pimplapure, Werner E. van Zyl, Henk Verweij, Mattijs G. J. Ten Cate, Jan W. Stouwdam |
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| Rok vydání: | 2003 |
| Předmět: |
chemistry.chemical_classification
Polypropylene Materials science Nanocomposite General Chemical Engineering General Chemistry Polymer Industrial and Manufacturing Engineering Catalysis chemistry.chemical_compound Differential scanning calorimetry chemistry Chemical engineering Nano Particle Crystallite |
| Zdroj: | Industrial & Engineering Chemistry Research. 42:3750-3757 |
| ISSN: | 1520-5045 0888-5885 |
| Popis: | Polypropylene (PP) composites containing nanosized (φ ∼ 10 nm) spherical silica particles were prepared in situ utilizing a 1-L slurry-phase polymerization reactor containing a MgCl2-supported Ziegler−Natta (fourth-generation) catalyst. Composites were prepared with variable filler sizes ranging from the nano- to microsize domain. The surface of the silica particles was modified with a silane coupling agent to prevent catalyst deactivation and to achieve better polymer/filler synergy by decreasing the hydrophobicity surrounding the bulk particle surface. The feasibility of the process was tested with low loading additions (∼3 wt % for each sample) of (nano)silica. The effect of the filler on the crystal structure and crystallite size of PP was studied with differential scanning calorimetry and wide-angle X-ray diffraction. The reaction kinetics of the nanocomposite (∼10 nm) was studied and compared with samples containing larger microsized particles. It was demonstrated that the former did not decrease th... |
| Databáze: | OpenAIRE |
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