Thermomechanical behavior of hydrogen-bond based supramolecular poly(ε-caprolactone)-silica nanocomposites

Colin C. Neikirk, Jae Woo Chung, Rodney D. Priestley

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

Supramolecular polymer nanocomposites represent an attractive alternative to traditional polymers for advanced materials that exhibit stimuli-responsive and self-healing properties. Here, we investigate the effects of specific hydrogen bonding interactions between surface functionalized silica nanoparticles and ureidopyrimidinone (UPy) based hydrogen bonded supramolecular poly(ε-caprolactone) in a supramolecular polymer nanocomposite. The effect of varying levels of nanoparticle UPy surface functionalization is considered. In addition to the anticipated improvements in Young's modulus (∼50%) and storage modulus (∼2×) with silica loading, increases in strain at breaking point (∼25%) with silica loading were observed and attributed to particle-matrix hydrogen bonding. However, increasing the extent of UPy surface functionality at a constant nanoparticle loading level led to a marked decrease in storage modulus relative to nanocomposites prepared with as-received silica nanoparticles. TEM investigation of these nanocomposites show an increase in nanoparticle aggregation. Nanoparticle aggregation provides both an explanation for the observed storage modulus reduction and evidence of particle-particle interactions. These results give interesting insight into the competing effects of specific supramolecular interactions in supramolecular polymer nanocomposite materials.

Original languageEnglish (US)
Pages (from-to)16686-16696
Number of pages11
JournalRSC Advances
Volume3
Issue number37
DOIs
StatePublished - Oct 7 2013

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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