Controlled hydrophobic functionalization of natural fibers through self-assembly of amphiphilic diblock copolymer micelles

Niko Aane, Janne Laine, Tuomas Hänninen, Ville Rantanen, Jani Seitsonen, Janne Ruokolainen, Eero Kontturi (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)

Abstract

The functionalization of natural fibers is an important task that has recently received considerable attention. We investigated the formation of a hydrophobic layer from amphiphilic diblock copolymer micelles [polystyrene‐block‐poly(N‐methyl‐4‐vinyl pyridinium iodide)] on natural fibers and on a model surface (mica). A series of micelles were prepared. The micelles were characterized by using cryoscopic TEM and light scattering, and their hydrophobization capability was studied through contact angle measurements, water adsorption, and Raman imaging. Mild heat treatment (130 °C) was used to increase the hydrophobization capability of the micelles. The results showed that the micelles could not hydrophobize a model surface, but could render the natural fibers water repellent both with and without heat treatment. This effect was systematically studied by varying the composition of the constituent blocks. The results showed that the micelle size (and the molecular weight of the constituent diblock copolymers) was the most important parameter, whereas the cationic (hydrophilic) part played only a minor role. We hypothesized that the hydrophobization effect could be attributed to a combination of the micelle size and the shrinkage of the natural fibers upon drying. The shrinking caused the roughness to increase on the fiber surface, which resulted in a rearrangement of the self‐ assembled layer in the wet state. Consequently, the fibers became hydrophobic through the roughness effects at multiple length scales. Mild heat treatment melted the micelle core and decreased the minimum size necessary for hydrophobization.
Original languageEnglish
Pages (from-to)1203-1208
JournalChemSusChem
Volume6
Issue number7
DOIs
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed

Fingerprint

Natural fibers
Micelles
Self assembly
Block copolymers
roughness
Heat treatment
iodide
light scattering
mica
transmission electron microscopy
Surface roughness
adsorption
water
natural fibre
Water
Fibers
Mica
Iodides
Angle measurement
Light scattering

Keywords

  • adsorption
  • block copolymers
  • hydrophobic effect
  • micelles
  • surface hemistry

Cite this

Aane, N., Laine, J., Hänninen, T., Rantanen, V., Seitsonen, J., Ruokolainen, J., & Kontturi, E. (2013). Controlled hydrophobic functionalization of natural fibers through self-assembly of amphiphilic diblock copolymer micelles. ChemSusChem, 6(7), 1203-1208. https://doi.org/10.1002/cssc.201300218
Aane, Niko ; Laine, Janne ; Hänninen, Tuomas ; Rantanen, Ville ; Seitsonen, Jani ; Ruokolainen, Janne ; Kontturi, Eero. / Controlled hydrophobic functionalization of natural fibers through self-assembly of amphiphilic diblock copolymer micelles. In: ChemSusChem. 2013 ; Vol. 6, No. 7. pp. 1203-1208.
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abstract = "The functionalization of natural fibers is an important task that has recently received considerable attention. We investigated the formation of a hydrophobic layer from amphiphilic diblock copolymer micelles [polystyrene‐block‐poly(N‐methyl‐4‐vinyl pyridinium iodide)] on natural fibers and on a model surface (mica). A series of micelles were prepared. The micelles were characterized by using cryoscopic TEM and light scattering, and their hydrophobization capability was studied through contact angle measurements, water adsorption, and Raman imaging. Mild heat treatment (130 °C) was used to increase the hydrophobization capability of the micelles. The results showed that the micelles could not hydrophobize a model surface, but could render the natural fibers water repellent both with and without heat treatment. This effect was systematically studied by varying the composition of the constituent blocks. The results showed that the micelle size (and the molecular weight of the constituent diblock copolymers) was the most important parameter, whereas the cationic (hydrophilic) part played only a minor role. We hypothesized that the hydrophobization effect could be attributed to a combination of the micelle size and the shrinkage of the natural fibers upon drying. The shrinking caused the roughness to increase on the fiber surface, which resulted in a rearrangement of the self‐ assembled layer in the wet state. Consequently, the fibers became hydrophobic through the roughness effects at multiple length scales. Mild heat treatment melted the micelle core and decreased the minimum size necessary for hydrophobization.",
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author = "Niko Aane and Janne Laine and Tuomas H{\"a}nninen and Ville Rantanen and Jani Seitsonen and Janne Ruokolainen and Eero Kontturi",
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Aane, N, Laine, J, Hänninen, T, Rantanen, V, Seitsonen, J, Ruokolainen, J & Kontturi, E 2013, 'Controlled hydrophobic functionalization of natural fibers through self-assembly of amphiphilic diblock copolymer micelles', ChemSusChem, vol. 6, no. 7, pp. 1203-1208. https://doi.org/10.1002/cssc.201300218

Controlled hydrophobic functionalization of natural fibers through self-assembly of amphiphilic diblock copolymer micelles. / Aane, Niko; Laine, Janne; Hänninen, Tuomas; Rantanen, Ville; Seitsonen, Jani; Ruokolainen, Janne; Kontturi, Eero (Corresponding Author).

In: ChemSusChem, Vol. 6, No. 7, 2013, p. 1203-1208.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Controlled hydrophobic functionalization of natural fibers through self-assembly of amphiphilic diblock copolymer micelles

AU - Aane, Niko

AU - Laine, Janne

AU - Hänninen, Tuomas

AU - Rantanen, Ville

AU - Seitsonen, Jani

AU - Ruokolainen, Janne

AU - Kontturi, Eero

PY - 2013

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N2 - The functionalization of natural fibers is an important task that has recently received considerable attention. We investigated the formation of a hydrophobic layer from amphiphilic diblock copolymer micelles [polystyrene‐block‐poly(N‐methyl‐4‐vinyl pyridinium iodide)] on natural fibers and on a model surface (mica). A series of micelles were prepared. The micelles were characterized by using cryoscopic TEM and light scattering, and their hydrophobization capability was studied through contact angle measurements, water adsorption, and Raman imaging. Mild heat treatment (130 °C) was used to increase the hydrophobization capability of the micelles. The results showed that the micelles could not hydrophobize a model surface, but could render the natural fibers water repellent both with and without heat treatment. This effect was systematically studied by varying the composition of the constituent blocks. The results showed that the micelle size (and the molecular weight of the constituent diblock copolymers) was the most important parameter, whereas the cationic (hydrophilic) part played only a minor role. We hypothesized that the hydrophobization effect could be attributed to a combination of the micelle size and the shrinkage of the natural fibers upon drying. The shrinking caused the roughness to increase on the fiber surface, which resulted in a rearrangement of the self‐ assembled layer in the wet state. Consequently, the fibers became hydrophobic through the roughness effects at multiple length scales. Mild heat treatment melted the micelle core and decreased the minimum size necessary for hydrophobization.

AB - The functionalization of natural fibers is an important task that has recently received considerable attention. We investigated the formation of a hydrophobic layer from amphiphilic diblock copolymer micelles [polystyrene‐block‐poly(N‐methyl‐4‐vinyl pyridinium iodide)] on natural fibers and on a model surface (mica). A series of micelles were prepared. The micelles were characterized by using cryoscopic TEM and light scattering, and their hydrophobization capability was studied through contact angle measurements, water adsorption, and Raman imaging. Mild heat treatment (130 °C) was used to increase the hydrophobization capability of the micelles. The results showed that the micelles could not hydrophobize a model surface, but could render the natural fibers water repellent both with and without heat treatment. This effect was systematically studied by varying the composition of the constituent blocks. The results showed that the micelle size (and the molecular weight of the constituent diblock copolymers) was the most important parameter, whereas the cationic (hydrophilic) part played only a minor role. We hypothesized that the hydrophobization effect could be attributed to a combination of the micelle size and the shrinkage of the natural fibers upon drying. The shrinking caused the roughness to increase on the fiber surface, which resulted in a rearrangement of the self‐ assembled layer in the wet state. Consequently, the fibers became hydrophobic through the roughness effects at multiple length scales. Mild heat treatment melted the micelle core and decreased the minimum size necessary for hydrophobization.

KW - adsorption

KW - block copolymers

KW - hydrophobic effect

KW - micelles

KW - surface hemistry

U2 - 10.1002/cssc.201300218

DO - 10.1002/cssc.201300218

M3 - Article

VL - 6

SP - 1203

EP - 1208

JO - ChemSusChem

JF - ChemSusChem

SN - 1864-5631

IS - 7

ER -