TY - JOUR
T1 - High-Resolution Patterned Biobased Thin Films via Self-Assembled Carbohydrate Block Copolymers and Nanocellulose
AU - Gestranius, Marie
AU - Otsuka, Issei
AU - Halila, Sami
AU - Hermida-Merino, Daniel
AU - Solano, Eduardo
AU - Borsali, Redouane
AU - Tammelin, Tekla
N1 - Publisher Copyright:
© 2020 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2020/4
Y1 - 2020/4
N2 - The exploitation of the effortless self-assembly behavior of biomass-based bricks can be seen as a promising route toward the innovative architectures. Here, a straightforward approach is presented where carbohydrate-based diblock copolymer, polystyrene-block-maltoheptaose (PS-b-MH), is organized either on a rigid ultrathin film or on a flexible self-standing film of wood-derived cellulose nanofibrils (CNFs). During solvent annealing PS-b-MH deposited on relatively rough CNF film undergoes spontaneous rearrangement into high-resolution patterns with a diblock domain spacing of 10–15 nm. The ideal conditions the self-assembly require weak interactions between block copolymer and the substrate to increase the chain mobility and enable rearrangements. This is exactly how the system behaves. Adsorption studies of PS-b-MH on CNF surfaces reveal weak interactions, and the formed PS-b-MH layer is soft and mobile. Even the appearance of more challenging vertical orientation formed on smooth CNF substrates is tentatively evidenced by grazing-incidence small-angle X-ray scattering and atomic force microscope indicating favorable surface interactions between CNF and PS-b-MH.
AB - The exploitation of the effortless self-assembly behavior of biomass-based bricks can be seen as a promising route toward the innovative architectures. Here, a straightforward approach is presented where carbohydrate-based diblock copolymer, polystyrene-block-maltoheptaose (PS-b-MH), is organized either on a rigid ultrathin film or on a flexible self-standing film of wood-derived cellulose nanofibrils (CNFs). During solvent annealing PS-b-MH deposited on relatively rough CNF film undergoes spontaneous rearrangement into high-resolution patterns with a diblock domain spacing of 10–15 nm. The ideal conditions the self-assembly require weak interactions between block copolymer and the substrate to increase the chain mobility and enable rearrangements. This is exactly how the system behaves. Adsorption studies of PS-b-MH on CNF surfaces reveal weak interactions, and the formed PS-b-MH layer is soft and mobile. Even the appearance of more challenging vertical orientation formed on smooth CNF substrates is tentatively evidenced by grazing-incidence small-angle X-ray scattering and atomic force microscope indicating favorable surface interactions between CNF and PS-b-MH.
KW - carbohydrate-based block copolymers
KW - cellulose nanofibrils
KW - green materials
KW - self-assembly
KW - thin films
UR - http://www.scopus.com/inward/record.url?scp=85079699180&partnerID=8YFLogxK
U2 - 10.1002/admi.201901737
DO - 10.1002/admi.201901737
M3 - Article
AN - SCOPUS:85079699180
SN - 2196-7350
VL - 7
JO - Advanced Materials Interfaces
JF - Advanced Materials Interfaces
IS - 7
M1 - 1901737
ER -