Surface Modification of Nanosilica for PP Composites
| Autor: | Outi Härkki, Tony Munter, Juha Sarlin, Jani Pelto |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Polypropylene
Nanocomposite Materials science Mechanical Engineering Composite number nanosilica Condensed Matter Physics law.invention chemistry.chemical_compound chemistry Mechanics of Materials law properties Specific surface area nanocomposites Surface modification General Materials Science Composite material Crystallization Glass transition surface modification polypropylene Fumed silica |
| Zdroj: | Pelto, J, Munter, T, Härkki, O & Sarlin, J 2012, ' Surface modification of nanosilica for PP composites ', Materials Science Forum, vol. 714, pp. 91-98 . https://doi.org/10.4028/www.scientific.net/MSF.714.91 Pelto, J, Munter, T, Härkki, O & Sarlin, J 2011, ' Surface modification of nanosilica for PP composites ', Nanocomposites 2011, Paris-Est, France, 7/06/11-10/06/11 . VTT Technical Research Centre of Finland-PURE |
| ISSN: | 1662-9752 |
| Popis: | Due to its high purity, favourable surface chemistry and huge specific surface area, fumed silica nanoparticles are suitable inorganic nanoscopic templates for organic modification and nanocomposite studies. Polypropylene offers good properties with low or moderate cost for many technical applications, such as for solid dielectrics. Polypropylene and hydrophilic silica nanoparticles have inherently dissimilar surface chemistries and organic modification of the silica is usually needed to achieve good mixing and nanocomposite properties. The target is to study robust grafting methods which can be up-scalable without complicated process steps. In this work nanosilica particles have been modified by grafting to method using equimolar amounts of various chain lengths of vinyl functional polyisobutene (PIB) oligomers (molecular weights 320 g/mol, 920 g/mol and 2300 g/mol, determined by material supplier), further functionalized by epoxidation and subsequent reaction with organosilane.The glass transition temperature, viscoelastic properties and crystallization behaviour of the PP composites with PIB grafted silicas (4.5 wt% silica) were altered. Especially the PIB2300 grafted silica composite showed improved low temperature fracture toughness, significantly (14°C) lower glass transition measured by DMA and higher crystallization temperature compared to the pure polypropylene. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|