Nanoparticle rearrangement under stress in networks of cellulose nanofibrils using in situ SAXS during tensile testing

Nanoscale
J EngströmE Malmström

Abstract

This study aims to describe and evaluate the mechanism for increased strain-at-break of composites made of cellulose nanofibrils (CNFs) reinforced with nanoscopic latex particles (<200 nm) stabilized by a cationic polyelectrolyte as corona. The applied latex nanoparticles (NPs), synthesized by polymerization-induced self-assembly (PISA), are composed of a neutral core polymer, either poly(butyl methacrylate) (PBMA) or poly(methyl methacrylate) (PMMA). At room temperature, PBMA is close to its glass transition (Tg), while PMMA is below its Tg. Nanocomposites with 75 wt% CNFs and 25 wt% NPs were analyzed using in situ small angle X-ray scattering during tensile testing, monitoring the structural evolution of the NPs under strain. The scattering of the spherical PMMA NPs, which do not coalesce like the PBMA NPs, shows changes to the organization of the NPs in the CNF-network. The observations are corroborated by cross-sectional transmission and scanning electron microscopy. No distinct change from spherical to ellipsoidal shape is evidenced for the PMMA NP cores during tensile strain. Changes in anisotropic scattering produced by the three-dimensional NP structure appear to be very different between nanocomposites loaded with PMMA...Continue Reading

References

Jan 12, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Lars WågbergKarl Axnäs
May 24, 2008·Biomacromolecules·Marielle HenrikssonTakashi Nishino
Mar 24, 2009·Nature Materials·Pinar AkcoraJack F Douglas
May 14, 2011·Chemical Society Reviews·Robert J MoonJeff Youngblood
Jan 31, 2015·Biomacromolecules·Nicholas Tchang CervinLars Wågberg
Apr 8, 2016·Chemical Reviews·Tao LiByeongdu Lee

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BETA
X-ray
force measurements
force measurement

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