Issue 3, 2019

PU nanocomposites from bifunctional nanoparticles: impact of liquid interphase on mechanical properties

Abstract

The Fe3O4@Poly(1,4-butanediol)/polyurethane nanocomposite is a highly interphase-dependable material with unique characteristics. Firstly, the nanoparticle's organic shell allows simple fabrication of very well dispersed nanocomposites and the incorporation of extremely high amounts of nanoparticles (NP) into the polymer matrix. Secondly, both chemical and physical aspects of the nanoparticles determine the material's mechanical behavior. The chemical functionality of the organic layer – free hydroxyl groups at the end of the tethered chains – ensures the material's stiffening through covalent bonds with the matrix, while being at molten state provides high flexibility and deformability yet maintaining mechanical resistance. As a result, nanocomposites at the low concentration region show increased elastic modulus and tensile strength and slight increase in total strain, while highly concentrated nanocomposites show reduction of elastic modulus and tensile strength and roughly double the total strain. The combination of the chemical and physical functionalities ensures high compatibility between nanoparticles and matrix and allows the production of highly concentrated – above 90% in weight – nanocomposites as a cohesive and flexible material, instead of a brittle wafer. This bifunctionality effect is unprecedented and the results open a wide range of new possibilities in the tailoring of functional nanomaterials for all sorts of applications in materials science.

Graphical abstract: PU nanocomposites from bifunctional nanoparticles: impact of liquid interphase on mechanical properties

Supplementary files

Article information

Article type
Communication
Submitted
12 nov 2018
Accepted
28 dec 2018
First published
03 jan 2019
This article is Open Access
Creative Commons BY-NC license

Nanoscale Adv., 2019,1, 973-979

PU nanocomposites from bifunctional nanoparticles: impact of liquid interphase on mechanical properties

C. C. Pessan, B. H. R. D. Lima and E. R. Leite, Nanoscale Adv., 2019, 1, 973 DOI: 10.1039/C8NA00345A

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