Hexagonal boron nitride (hBN) is an excellent 2D nanomaterials due to having an impressive mechanical property (Young’s modulus ~1 TPa and elastic constant of 220-510 N/m (Boldrin et al., 2011)) along with its high thermal conductivity (600 W/m-K for the in-plane direction, 30 W/m-K for the out-of-plane direction (Boldrin et al., 2011)). Wide band gap of boron nitride (~5.97 eV (Boldrin et al., 2011)) and high aspect ratio (aspect ratio for exfoliated BNNS used in the TPU nanocomposites ~400) makes it a perfect reinforcement filler for the application of electrically insulating but thermally conductive composite materials. While polymer nanocomposites offer a wide range of application including packaging to the automotive due to its exceptional low cost and lightweights with improved thermal and mechanical properties, one of the main challenges in polymer nanocomposites is its interfacial interaction between reinforcement fillers and polymer matrix which affects filler dispersibility and thus, manipulates mechanical and thermal properties.
In this work, an isocyanate functionalized boron nitride nanosheets (BNNS) is reported as a reinforcement to the thermoplastic polyurethane (TPU) matrix which shows an excellent compatibility to the TPU matrix and thus, improving mechanical properties along with its thermal stability by just adding up to 1 wt.%. Result shows that, for 10 wt. % mass loss, isocyanate functionalized BNNS can improve the thermal stability of TPU by 2.2 % by just adding 0.1 wt.% reinforcement into the polymer matrix. The effect of reinforcement on thermal properties such as glass transition and melting point temperatures, and mechanical properties will also be discussed.
5:00 PM–7:00 PM Apr 23, 2019 (US - Arizona)
PCC North, 300 Level, Exhibit Hall C-E