Roll-to-roll fabrication of cellulose nanocrystal-poly(vinyl alcohol) composite coatings with controlled anisotropy

Reaz A. Chowdhury; Caitlyn Clarkson; Vitus A. Apalangya; S. M.Naeemul Islam; Jeffrey P. Youngblood

doi:10.1007/s10570-018-2019-5

Roll-to-roll fabrication of cellulose nanocrystal-poly(vinyl alcohol) composite coatings with controlled anisotropy

Reaz A. Chowdhury, Caitlyn Clarkson, Vitus A. Apalangya, S. M.Naeemul Islam, Jeffrey P. Youngblood

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

26 Scopus citations

Abstract

Cellulose nanocrystal (CNC) composite coatings may impart many benefits in packaging, electronic, optical, etc. applications, however, large-scale cellulose coating production is a major engineering challenge. A versatile roll-to-roll reverse gravure process for the manufacture of cellulose nanocrystal-poly(vinyl alcohol) (CNC–PVA) coatings on a flexible polymer substrate was investigated in the present work. CNC content was varied from 0 to 100% to determine the effect of CNC concentration on coating anisotropy. Coatings were characterized by polarized light microscopy, UV–Vis spectrophotometry, cross-hatch adhesion testing and optical profilometry. This method produced uniform, highly transparent coatings with surface roughness less than 100 nm for all CNC–PVA weight ratios examined. The isotropic-anisotropic coating transformation was observed above 50% CNC, with a maximum anisotropy at 70% CNC along the shear direction. Anisotropic CNC–PVA coatings exhibited increased water vapor barrier performance due to the increased CNC packing and density.

Original language	English
Pages (from-to)	6547-6560
Number of pages	14
Journal	Cellulose
Volume	25
Issue number	11
DOIs	https://doi.org/10.1007/s10570-018-2019-5
State	Published - Nov 1 2018
Externally published	Yes

Funding

The research was supported by the National Science Foundation Scalable Nanomanufacturing program under award CMMI-1449358. It was also partially supported by the National Science Foundation-Integrative Graduate Education and Research Traineeship: Sustainable Electronics Grant-1144843, and partially supported by “Building a New Generation of Academics in Africa (BANGA-AFRICA) project which is funded by the Carnegie Corporation of New York”.

Funders	Funder number
BANGA-AFRICA
National Science Foundation-Integrative Graduate Education and Research Traineeship
National Science Foundation	CMMI-1449358
Carnegie Corporation of New York

Keywords

Anisotropy
Cellulose nanocrystals
Poly(vinyl alcohol)
Roll-to-roll
Transparency

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10.1007/s10570-018-2019-5

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title = "Roll-to-roll fabrication of cellulose nanocrystal-poly(vinyl alcohol) composite coatings with controlled anisotropy",

abstract = "Cellulose nanocrystal (CNC) composite coatings may impart many benefits in packaging, electronic, optical, etc. applications, however, large-scale cellulose coating production is a major engineering challenge. A versatile roll-to-roll reverse gravure process for the manufacture of cellulose nanocrystal-poly(vinyl alcohol) (CNC–PVA) coatings on a flexible polymer substrate was investigated in the present work. CNC content was varied from 0 to 100% to determine the effect of CNC concentration on coating anisotropy. Coatings were characterized by polarized light microscopy, UV–Vis spectrophotometry, cross-hatch adhesion testing and optical profilometry. This method produced uniform, highly transparent coatings with surface roughness less than 100 nm for all CNC–PVA weight ratios examined. The isotropic-anisotropic coating transformation was observed above 50% CNC, with a maximum anisotropy at 70% CNC along the shear direction. Anisotropic CNC–PVA coatings exhibited increased water vapor barrier performance due to the increased CNC packing and density.",

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AU - Clarkson, Caitlyn

AU - Apalangya, Vitus A.

AU - Islam, S. M.Naeemul

AU - Youngblood, Jeffrey P.

PY - 2018/11/1

Y1 - 2018/11/1

N2 - Cellulose nanocrystal (CNC) composite coatings may impart many benefits in packaging, electronic, optical, etc. applications, however, large-scale cellulose coating production is a major engineering challenge. A versatile roll-to-roll reverse gravure process for the manufacture of cellulose nanocrystal-poly(vinyl alcohol) (CNC–PVA) coatings on a flexible polymer substrate was investigated in the present work. CNC content was varied from 0 to 100% to determine the effect of CNC concentration on coating anisotropy. Coatings were characterized by polarized light microscopy, UV–Vis spectrophotometry, cross-hatch adhesion testing and optical profilometry. This method produced uniform, highly transparent coatings with surface roughness less than 100 nm for all CNC–PVA weight ratios examined. The isotropic-anisotropic coating transformation was observed above 50% CNC, with a maximum anisotropy at 70% CNC along the shear direction. Anisotropic CNC–PVA coatings exhibited increased water vapor barrier performance due to the increased CNC packing and density.

AB - Cellulose nanocrystal (CNC) composite coatings may impart many benefits in packaging, electronic, optical, etc. applications, however, large-scale cellulose coating production is a major engineering challenge. A versatile roll-to-roll reverse gravure process for the manufacture of cellulose nanocrystal-poly(vinyl alcohol) (CNC–PVA) coatings on a flexible polymer substrate was investigated in the present work. CNC content was varied from 0 to 100% to determine the effect of CNC concentration on coating anisotropy. Coatings were characterized by polarized light microscopy, UV–Vis spectrophotometry, cross-hatch adhesion testing and optical profilometry. This method produced uniform, highly transparent coatings with surface roughness less than 100 nm for all CNC–PVA weight ratios examined. The isotropic-anisotropic coating transformation was observed above 50% CNC, with a maximum anisotropy at 70% CNC along the shear direction. Anisotropic CNC–PVA coatings exhibited increased water vapor barrier performance due to the increased CNC packing and density.

KW - Anisotropy

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KW - Poly(vinyl alcohol)

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KW - Transparency

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Roll-to-roll fabrication of cellulose nanocrystal-poly(vinyl alcohol) composite coatings with controlled anisotropy

Abstract

Funding

Keywords

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