Surface modification of nanosilica for PP composites

Jani Pelto, Tony Munter, Outi Härkki, Juha Sarlin

Research output: Contribution to journalArticleScientificpeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)91-98
Number of pages8
JournalMaterials Science Forum
Volume714
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

Keywords

  • nanocomposites
  • nanosilica
  • surface modification
  • polypropylene
  • properties

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