Control of phase-separated morphology in mixed monolayers of amphiphilic comb polymers containing diamino-s-triazine and non-amphiphilic s-triazine derivatives with fluorocarbons

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2022-05, Vol.641, p.128485, Article 128485
• Main Authors: Maruyama, Haruka, Shioda, Yoshiki, Maeda, Momo, Fujimori, Atsuhiro
• Format: Article
• Language: English
• Subjects: Comb copolymer; Fluorocarbon; Langmuir-Blodgett film; Mixed monolayer; Phase separation; s-Triazine ring
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2022.128485

In this study, s-triazine rings (or their derivatives) were introduced into a two-dimensional phase-separated mixed monolayer of hydrocarbon-fluorocarbon chains. The diamino-triazine ring facilitated the absorption of deoxyribonucleic acid (DNA) molecules in the mixed monolayer. The diamino s-triazine ring-containing copolymers into which a hydrogenated hydrophobic chain was introduced were able to form mixed-phase-separated monolayers when combined with an s-triazine ring-containing fluorocarbon-based molecule with low molecular weight having no hydrophilic group. Hydrocarbon-based copolymers that formed side-chain crystals in the single-component monolayer influenced the steric hindrance of the diamino s-triazine ring and tended to be amorphous in the mixed film. However, the regularity along the c-axis direction was guaranteed, and introducing long-chain alkylated amphiphilic molecules enhanced the crystallinity and promoted the formation of circular domains. Comparatively, the fluorocarbon, which was amorphous in the single-component monolayer, promoted two-dimensional crystallization by enhancing the π-π interaction between the s-triazine rings in the phase-separated monolayer. [Display omitted] •A mixed monolayer of comb-copolymer and fluorocarbon-based molecule was prepared.•An s-triazine ring was introduced into both comb-copolymer and fluorinated molecule.•Hydrogenated comb-copolymer has diamino-s-triazine indicating DNA-absorbing ability.•Mixed monolayers in this study showed a phase-separated patterning.•DNA molecule was adsorbed on the phase-separated monolayers.