Controlling self-assembling co-polymer coatings of hydrophilic polysaccharide substrates via co-polymer block length ratio

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2023-06-15
Major/Subject
Mcode
Degree programme
Language
en
Pages
11
809-819
Series
Journal of Colloid and Interface Science, Volume 640
Abstract
Hypothesis: The degree of polymerization of amphiphilic di-block co-polymers, which can be varied with ease in computer simulations, provides a means to control self-assembling di-block co-polymer coatings on hydrophilic substrates. Simulations: We examine self-assembly of linear amphiphilic di-block co-polymers on hydrophilic surface via dissipative particle dynamics simulations. The system models a glucose based polysaccharide surface on which random co-polymers of styrene and n-butyl acrylate, as the hydrophobic block, and starch, as the hydrophilic block, forms a film. Such setups are common in e.g. hygiene, pharmaceutical, and paper product applications.  Findings: Variation of the block length ratio (35 monomers in total) reveals that all examined compositions readily coat the substrate. However, strongly asymmetric block co-polymers with short hydrophobic segments are best in wetting the surface, whereas approximately symmetric composition leads to most stable films with highest internal order and well-defined internal stratification. At intermediate asymmetries, isolated hydrophobic domains form. We map the sensitivity and stability of the assembly response for a large variety of interaction parameters. The reported response persists for a wide polymer mixing interactions range, providing general means to tune surface coating films and their internal structure, including compartmentalization.
Description
Funding Information: This work was supported by Business Finland Co-Innovation Grant No. 3767/31/2019 (M.S.) and the Academy of Finland through its Centres of Excellence Programme (2022–2029, LIBER) under project No. 346111 (M.S.). We are grateful for the support by FinnCERES Materials Bioeconomy Ecosystem. The authors acknowledge discussions with Anneli Lepo, Kemira Oyj, Finland. Computational resources by CSC IT Centre for Finland and RAMI – RawMatters Finland Infrastructure are also gratefully acknowledged. Publisher Copyright: © 2023 The Author(s)
Keywords
Amphiphilic self-assembly, Assembly morphology, Block copolymer, Hydrophilic surface, Polymer coating, Polymer film, Surface functionalization
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Citation
Scacchi , A , Hasheminejad , K , Javan Nikkhah , S & Sammalkorpi , M 2023 , ' Controlling self-assembling co-polymer coatings of hydrophilic polysaccharide substrates via co-polymer block length ratio ' , Journal of Colloid and Interface Science , vol. 640 , pp. 809-819 . https://doi.org/10.1016/j.jcis.2023.02.117