Enhancement of the thermal and mechanical properties of a surface-modified boron nitride-polyurethane composite

Kiho Kim, Myeongjin Kim, Jooheon Kim

Research output: Contribution to journalArticlepeer-review

64 Scopus citations

Abstract

Thermoplastic polyurethane (PU) elastomer, prepared from poly(tetramethylene glycol) and methyl diphenyl diisocyanate, was blended with boron nitride (BN) to fabricate a thermally conductive interface material. BN treated by a silane coupling agent (BN-NH2) and PU-grafted BN were prepared to fabricate a composite that has better thermal conductivity and mechanical strength. The surface-modified filler showed enhanced dispersibility and affinity because of the surface treatment with functional groups that affected the surface free energy, along with the structural similarity of the doped crystallized diisocyanate molecule with the matrix. The thermal conductivity increased from 0.349 to 0.467Wmk-1 on 20wt% PU-grafted BN loading that is a 1.34-fold higher value than in the case of pristine BN loading at the same weight fraction. Moreover, the number of BN particles acting as defects, thereby reducing the mechanical strength, is decreased because of strong adhesion. We can conclude that these composite materials may be promising materials for a significant performance improvement in terms of both the thermal and mechanical properties of PU-based polymers.

Original languageEnglish
Pages (from-to)791-798
Number of pages8
JournalPolymers for Advanced Technologies
Volume25
Issue number8
DOIs
StatePublished - Aug 2014

Keywords

  • Boron nitride
  • Ceramic matrix composites
  • Mechanical properties
  • Surface treatments
  • Thermal properties

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