Polyurethane nanocomposites reinforced with surface modified halloysite nanotubes

Hui Jing, Yuji Higaki, Tatsuya Ishikawa, Kevin L. White, Hideyuki Otsuka, Atsushi Takahara

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The physical properties of polyurethane (PU) reinforced with surface modified halloysite nanotubes (HNTs) were investigated. The HNTs were modified with two different surface modifiers: n-octadecyltrimethoxysilane (OTMS) and N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (AEAPS). The external surface modifiers were introduced through a chemical vapor adsorption (CVA) process. The dynamic light scattering of HNTs dispersed solution indicates that the OTMS-modified HNTs (O-HNTs) are dispersed in THF better than unmodified one. The modified HNTs were mixed with PU resin by solution blending. The PU/O-HNTs nanocomposites show significant improvements in tensile and thermal properties. At 0.5 wt% O-HNTs, the nanocomposite shows large increase in tensile strength and modulus, and 30% increase in elongation at break with respect to the unfilled PU. The simultaneous improvement in modulus, strength, and ductility is attributed to the interaction between the welldispersed O-HNTs and the PU matrix. The application of modified HNTs for flame retardant nanocomposite was done by loading bisphenol-A bis(diphenyl phosphate) (BDP) into the hydrophobically modified lumen of HNTs. The exterior surface was subsequently modified with AEAPS using a CVA process. The AEAPS-modified HNTs containing BDP show improved flame retardant performance without sacrificing the mechanical properties.

Original languageEnglish
Pages (from-to)974-980
Number of pages7
JournalScience of Advanced Materials
Volume7
Issue number5
DOIs
Publication statusPublished - Jan 1 2015

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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