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
AN - SCOPUS:85044754894
SN - 0266-3538
VL - 160
SP - 145
EP - 151
JO - Composites Science and Technology
JF - Composites Science and Technology
ER -