Protein-mediated interfacial adhesion in composites of cellulose nanofibrils and polylactide

Enhanced toughness towards material development

Alexey Khakalo, Ilari Filpponen, Orlando J. Rojas

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)

Abstract

The role of animal protein, casein, as compatibilizer and eco-friendly dispersant in composites comprising cellulose nanofibrils (CNF) and polylactic acid (PLA) was investigated. The effect of casein-mediated surface modification of PLA was validated with dynamic adhesion experiments that considered the contact area according to JKR approximation. In fact, a remarkable increase by ∼50% in the work of adhesion between CNF and PLA was observed after casein adsorption. It is likely that the improved adhesion gave rise to an enhanced dispersion of CNF and PLA within the composite matrix. Moreover, the mechanical properties of the respective nanocomposites were significantly improved. When compared to protein-free CNF/PLA nanocomposites, the systems containing casein indicated an enhanced extensibility (by 130%) and tensile toughness (by 60%) whereas tensile strength and Young's modulus were improved to a limited extent (6 and 12%, respectively). Finally, it is demonstrated that the surface modification of PLA with casein improves the compatibility between CNF and PLA, which is a prerequisite for the feasible preparation of 3D shaped cellulose-based packaging materials by direct thermoforming.

Original languageEnglish
Pages (from-to)145-151
Number of pages7
JournalComposites Science and Technology
Volume160
DOIs
Publication statusPublished - 26 May 2018
MoE publication typeA1 Journal article-refereed

Fingerprint

Cellulose
Toughness
Casein
Adhesion
Caseins
Proteins
Acids
Composite materials
Surface treatment
Nanocomposites
Thermoforming
Packaging materials
Compatibilizers
poly(lactic acid)
poly(lactide)
Animals
Tensile strength
Elastic moduli
Adsorption
Mechanical properties

Keywords

  • Adhesion
  • Composites
  • Nanofibrillated cellulose
  • Polylactide
  • Proteins

Cite this

@article{49dfb83806414238bbd38126f5f06f3c,
title = "Protein-mediated interfacial adhesion in composites of cellulose nanofibrils and polylactide: Enhanced toughness towards material development",
abstract = "The role of animal protein, casein, as compatibilizer and eco-friendly dispersant in composites comprising cellulose nanofibrils (CNF) and polylactic acid (PLA) was investigated. The effect of casein-mediated surface modification of PLA was validated with dynamic adhesion experiments that considered the contact area according to JKR approximation. In fact, a remarkable increase by ∼50{\%} in the work of adhesion between CNF and PLA was observed after casein adsorption. It is likely that the improved adhesion gave rise to an enhanced dispersion of CNF and PLA within the composite matrix. Moreover, the mechanical properties of the respective nanocomposites were significantly improved. When compared to protein-free CNF/PLA nanocomposites, the systems containing casein indicated an enhanced extensibility (by 130{\%}) and tensile toughness (by 60{\%}) whereas tensile strength and Young's modulus were improved to a limited extent (6 and 12{\%}, respectively). Finally, it is demonstrated that the surface modification of PLA with casein improves the compatibility between CNF and PLA, which is a prerequisite for the feasible preparation of 3D shaped cellulose-based packaging materials by direct thermoforming.",
keywords = "Adhesion, Composites, Nanofibrillated cellulose, Polylactide, Proteins",
author = "Alexey Khakalo and Ilari Filpponen and Rojas, {Orlando J.}",
year = "2018",
month = "5",
day = "26",
doi = "10.1016/j.compscitech.2018.03.013",
language = "English",
volume = "160",
pages = "145--151",
journal = "Composites Science and Technology",
issn = "0266-3538",
publisher = "Elsevier",

}

Protein-mediated interfacial adhesion in composites of cellulose nanofibrils and polylactide : Enhanced toughness towards material development. / Khakalo, Alexey; Filpponen, Ilari; Rojas, Orlando J.

In: Composites Science and Technology, Vol. 160, 26.05.2018, p. 145-151.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Protein-mediated interfacial adhesion in composites of cellulose nanofibrils and polylactide

T2 - Enhanced toughness towards material development

AU - Khakalo, Alexey

AU - Filpponen, Ilari

AU - Rojas, Orlando J.

PY - 2018/5/26

Y1 - 2018/5/26

N2 - The role of animal protein, casein, as compatibilizer and eco-friendly dispersant in composites comprising cellulose nanofibrils (CNF) and polylactic acid (PLA) was investigated. The effect of casein-mediated surface modification of PLA was validated with dynamic adhesion experiments that considered the contact area according to JKR approximation. In fact, a remarkable increase by ∼50% in the work of adhesion between CNF and PLA was observed after casein adsorption. It is likely that the improved adhesion gave rise to an enhanced dispersion of CNF and PLA within the composite matrix. Moreover, the mechanical properties of the respective nanocomposites were significantly improved. When compared to protein-free CNF/PLA nanocomposites, the systems containing casein indicated an enhanced extensibility (by 130%) and tensile toughness (by 60%) whereas tensile strength and Young's modulus were improved to a limited extent (6 and 12%, respectively). Finally, it is demonstrated that the surface modification of PLA with casein improves the compatibility between CNF and PLA, which is a prerequisite for the feasible preparation of 3D shaped cellulose-based packaging materials by direct thermoforming.

AB - The role of animal protein, casein, as compatibilizer and eco-friendly dispersant in composites comprising cellulose nanofibrils (CNF) and polylactic acid (PLA) was investigated. The effect of casein-mediated surface modification of PLA was validated with dynamic adhesion experiments that considered the contact area according to JKR approximation. In fact, a remarkable increase by ∼50% in the work of adhesion between CNF and PLA was observed after casein adsorption. It is likely that the improved adhesion gave rise to an enhanced dispersion of CNF and PLA within the composite matrix. Moreover, the mechanical properties of the respective nanocomposites were significantly improved. When compared to protein-free CNF/PLA nanocomposites, the systems containing casein indicated an enhanced extensibility (by 130%) and tensile toughness (by 60%) whereas tensile strength and Young's modulus were improved to a limited extent (6 and 12%, respectively). Finally, it is demonstrated that the surface modification of PLA with casein improves the compatibility between CNF and PLA, which is a prerequisite for the feasible preparation of 3D shaped cellulose-based packaging materials by direct thermoforming.

KW - Adhesion

KW - Composites

KW - Nanofibrillated cellulose

KW - Polylactide

KW - Proteins

UR - http://www.scopus.com/inward/record.url?scp=85044754894&partnerID=8YFLogxK

U2 - 10.1016/j.compscitech.2018.03.013

DO - 10.1016/j.compscitech.2018.03.013

M3 - Article

VL - 160

SP - 145

EP - 151

JO - Composites Science and Technology

JF - Composites Science and Technology

SN - 0266-3538

ER -