Journal
POLYMER
Volume 97, Issue -, Pages 31-43Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2016.05.012
Keywords
Polyurethane nanocomposite; Zeolitic imidazolate framework; Viscoelasticity; Thermo-mechanical behaviour
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Funding
- Royal Society Research Grants [RG140296]
- EU [604646]
- Yayasan Khazanah (YK)
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Polymer-based nanocomposites incorporating porous hybrid materials is fast becoming a staple in addressing environmental and sustainability challenges. Herein we investigate the intricate dynamics underpinning the molecular interactions between the porous nanoparticles of a zeolitic metal-organic framework (ZIF-8) and a hyperelastic polymer matrix (polyurethane, PU). We fabricated novel PU/ZIF-8 mixed-matrix nanocomposite membranes (similar to 100 mu m thickness) with up to 40 wt.% ZIF-8 nanoparticles, and characterised their quasi-static and dynamic thermo-mechanical properties via dynamic mechanical measurements, nanoindentation, thermogravimetric and tensile experiments. ZIF-8 nanoparticles significantly modify the thermo-mechanical properties of polyurethane matrix, improving overall stiffness, fracture energy, and yield strength at the cost of ductility (beyond similar to 30 wt.%). Thermal stability was enhanced, likewise dynamic responses and phase changes were stabilised with increasing nanoparticle loading. Secondary molecular interactions between ZIF-8 nanoparticles and polyurethane chains are responsible for the salient thermo-mechanical and dynamic behaviour observed. Our findings may guide developments of resilient rubbery-MOF nanocomposite systems for practical applications. (C) 2016 Elsevier Ltd. All rights reserved.
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