Issue 45, 2023

Hydrophobically modified complex coacervates for designing aqueous pressure-sensitive adhesives

Abstract

The rheology of complex coacervates can be elegantly tuned via the design and control of specific non-covalent hydrophobic interactions between the complexed polymer chains. The well-controlled balance between elasticity and energy dissipation makes complex coacervates perfect candidates for pressure-sensitive adhesives (PSAs). In this work, the polyanion poly(3-sulfopropyl methacrylate) (PSPMA) and the polycation quaternized poly(4-vinylpyridine) (QP4VP) were used to prepare complex coacervates in water. Progressive increase of hydrophobicity is introduced to the polyanion via partial deprotection of the protected precursor. Hence, the polymer chains in the complex coacervates can interact via both electrostatic (controlled by the amount of salt) and hydrophobic (controlled by the deprotection degree) interactions. It was observed that: (i) a rheological time-salt-hydrophobicity superposition principle is applicable, and can be used as a predictive tool for rheology, (ii) the slowdown of the stress relaxation dynamics, due to the increase of hydrophobic stickers (lower deprotection degree), can be captured by the sticky-Rouse model, and (iii) the systematic variation of hydrophobic stickers, amount of salt, and molecular weight of the polymers, enables the identification of optimizing parameters to design aqueous PSA systems. The presented results offer new pathways to control the rheology of complex coacervates and their applicability as PSAs.

Graphical abstract: Hydrophobically modified complex coacervates for designing aqueous pressure-sensitive adhesives

Supplementary files

Article information

Article type
Paper
Submitted
24 Aug 2023
Accepted
20 Okt 2023
First published
07 Nov 2023
This article is Open Access
Creative Commons BY-NC license

Soft Matter, 2023,19, 8832-8848

Hydrophobically modified complex coacervates for designing aqueous pressure-sensitive adhesives

L. van Westerveld, J. Es Sayed, M. de Graaf, A. H. Hofman, M. Kamperman and D. Parisi, Soft Matter, 2023, 19, 8832 DOI: 10.1039/D3SM01114C

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