Polymer-Induced Modification of Cellulose Nanocrystal Assemblies in Aqueous Suspensions

Neta Cohen; Guy Ochbaum; Yael Levi-Kalisman; Ronit Bitton; Rachel Yerushalmi-Rozen

doi:https://doi.org/10.1021/acsapm.9b01048

Polymer-Induced Modification of Cellulose Nanocrystal Assemblies in Aqueous Suspensions

Neta Cohen, Guy Ochbaum, Yael Levi-Kalisman, Ronit Bitton, Rachel Yerushalmi-Rozen

Ben-Gurion University of the Negev, The Hebrew University of Jerusalem

Research output: Contribution to journal › Article › peer-review

Abstract

The effect of adsorbing, nonionic polymers on the phase behavior of cellulose nanocrystals (CNCs) is of interest for design and preparation of functional hybrids. CNC assembly into a chiral nematic phase (N*) was investigated in the presence of highly hydrated poly(vinyl alcohol) (HPVA), low hydrated PVA (LPVA), and poly(vinylpyrrolidone) (PVP). Mapping of the nano-to-micro structure via small-angle X-ray scattering (SAXS), cryogenic transmission electron microscopy (cryo-TEM), and polarized light microscopy (POM) reveals the presence of nematic islands already at very low CNC concentrations. While the polymer-decorated CNCs preserve the structure of the native N∗ phase, solvated PVA at concentrations above the semidilute regime disrupt the CNCs' self-organization into the liquid-crystalline phase, whereas PVP does not. It is suggested that the specific structure of the polymers rather than their physical properties or depletion interactions dominates the nanostructure and phase behavior of the polymer-CNC mixtures.

Original language	American English
Pages (from-to)	732-740
Number of pages	9
Journal	ACS Applied Polymer Materials
Volume	2
Issue number	2
DOIs	https://doi.org/10.1021/acsapm.9b01048
State	Published - 18 Dec 2019

Keywords

CNCs
SAXS
chiral nematic
depletion
self-organization
tactoids

All Science Journal Classification (ASJC) codes

Polymers and Plastics
Process Chemistry and Technology
Organic Chemistry

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https://doi.org/10.1021/acsapm.9b01048

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title = "Polymer-Induced Modification of Cellulose Nanocrystal Assemblies in Aqueous Suspensions",

abstract = "The effect of adsorbing, nonionic polymers on the phase behavior of cellulose nanocrystals (CNCs) is of interest for design and preparation of functional hybrids. CNC assembly into a chiral nematic phase (N*) was investigated in the presence of highly hydrated poly(vinyl alcohol) (HPVA), low hydrated PVA (LPVA), and poly(vinylpyrrolidone) (PVP). Mapping of the nano-to-micro structure via small-angle X-ray scattering (SAXS), cryogenic transmission electron microscopy (cryo-TEM), and polarized light microscopy (POM) reveals the presence of nematic islands already at very low CNC concentrations. While the polymer-decorated CNCs preserve the structure of the native N∗ phase, solvated PVA at concentrations above the semidilute regime disrupt the CNCs' self-organization into the liquid-crystalline phase, whereas PVP does not. It is suggested that the specific structure of the polymers rather than their physical properties or depletion interactions dominates the nanostructure and phase behavior of the polymer-CNC mixtures.",

keywords = "CNCs, SAXS, chiral nematic, depletion, self-organization, tactoids",

author = "Neta Cohen and Guy Ochbaum and Yael Levi-Kalisman and Ronit Bitton and Rachel Yerushalmi-Rozen",

note = "Funding Information: We thank Dr. Yimin Mao from the NIST Center for Neutron Research for fruitful discussion. R.Y.-R. holds the Stanley D. and Nikki Waxberg professorial chair in Advanced Materials. The support of the Israel Science Foundation (ISF Grant 193-18) is acknowledged. Publisher Copyright: Copyright {\textcopyright} 2019 American Chemical Society.",

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doi = "https://doi.org/10.1021/acsapm.9b01048",

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AU - Cohen, Neta

AU - Ochbaum, Guy

AU - Levi-Kalisman, Yael

AU - Bitton, Ronit

AU - Yerushalmi-Rozen, Rachel

N1 - Funding Information: We thank Dr. Yimin Mao from the NIST Center for Neutron Research for fruitful discussion. R.Y.-R. holds the Stanley D. and Nikki Waxberg professorial chair in Advanced Materials. The support of the Israel Science Foundation (ISF Grant 193-18) is acknowledged. Publisher Copyright: Copyright © 2019 American Chemical Society.

PY - 2019/12/18

Y1 - 2019/12/18

N2 - The effect of adsorbing, nonionic polymers on the phase behavior of cellulose nanocrystals (CNCs) is of interest for design and preparation of functional hybrids. CNC assembly into a chiral nematic phase (N*) was investigated in the presence of highly hydrated poly(vinyl alcohol) (HPVA), low hydrated PVA (LPVA), and poly(vinylpyrrolidone) (PVP). Mapping of the nano-to-micro structure via small-angle X-ray scattering (SAXS), cryogenic transmission electron microscopy (cryo-TEM), and polarized light microscopy (POM) reveals the presence of nematic islands already at very low CNC concentrations. While the polymer-decorated CNCs preserve the structure of the native N∗ phase, solvated PVA at concentrations above the semidilute regime disrupt the CNCs' self-organization into the liquid-crystalline phase, whereas PVP does not. It is suggested that the specific structure of the polymers rather than their physical properties or depletion interactions dominates the nanostructure and phase behavior of the polymer-CNC mixtures.

AB - The effect of adsorbing, nonionic polymers on the phase behavior of cellulose nanocrystals (CNCs) is of interest for design and preparation of functional hybrids. CNC assembly into a chiral nematic phase (N*) was investigated in the presence of highly hydrated poly(vinyl alcohol) (HPVA), low hydrated PVA (LPVA), and poly(vinylpyrrolidone) (PVP). Mapping of the nano-to-micro structure via small-angle X-ray scattering (SAXS), cryogenic transmission electron microscopy (cryo-TEM), and polarized light microscopy (POM) reveals the presence of nematic islands already at very low CNC concentrations. While the polymer-decorated CNCs preserve the structure of the native N∗ phase, solvated PVA at concentrations above the semidilute regime disrupt the CNCs' self-organization into the liquid-crystalline phase, whereas PVP does not. It is suggested that the specific structure of the polymers rather than their physical properties or depletion interactions dominates the nanostructure and phase behavior of the polymer-CNC mixtures.

KW - CNCs

KW - SAXS

KW - chiral nematic

KW - depletion

KW - self-organization

KW - tactoids

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Polymer-Induced Modification of Cellulose Nanocrystal Assemblies in Aqueous Suspensions

Abstract

Keywords

All Science Journal Classification (ASJC) codes

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