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In Situ Monitoring of Latex Film Formation by Small-Angle Neutron Scattering: Evolving Distributions of Hydrophilic Stabilizers in Drying Colloidal Films

Martín-Fabiani, Ignacio, Makepeace, David K., Richardson, Philip G., Lesage de la Haye, Jennifer, Venero, Diego Alba, Rogers, Sarah E., D’Agosto, Franck, Lansalot, Muriel and Keddie, Joseph L. (2019) In Situ Monitoring of Latex Film Formation by Small-Angle Neutron Scattering: Evolving Distributions of Hydrophilic Stabilizers in Drying Colloidal Films Langmuir, 35 (10). pp 3822-3831.

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Abstract

The distribution of hydrophilic species, such as surfactants, in latex films is of critical importance for the performance of adhesives, coatings, and inks, among others. However, the evolution of this distribution during the film formation process and in the resulting dried films remains insufficiently elucidated. Here, we present in situ (wet) and ex situ (dry) small-angle neutron scattering (SANS) experiments that follow the film formation of two types of latex particles, which differ in their stabilizer: either a covalently bonded poly(methacrylic acid) (PMAA) segment or a physically adsorbed surfactant (sodium dodecyl sulfate, SDS). By fitting the experimental SANS data and combining with gravimetry experiments, we have ascertained the hydrophilic species distribution within the drying film and followed its evolution by correlating the size and shape of stabilizer clusters with the drying time. The evolution of the SDS distribution over drying time is being driven by a reduction in the interfacial free energy. However, the PMAA-based stabilizer macromolecules are restricted by their covalent bonding to core polymer chains and hence form high-surface area disclike phases at the common boundary between particles and PMAA micelles. Contrary to an idealized view of film formation, PMAA does not remain in the walls of a continuous honeycomb structure. The results presented here shed new light on the nanoscale distribution of hydrophilic species in drying and ageing latex films. We provide valuable insights into the influence of the stabilizer mobility on the final structure of latex films.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Martín-Fabiani, Ignacio
Makepeace, David K.d.makepeace@surrey.ac.uk
Richardson, Philip G.
Lesage de la Haye, Jennifer
Venero, Diego Alba
Rogers, Sarah E.
D’Agosto, Franck
Lansalot, Muriel
Keddie, Joseph L.J.Keddie@surrey.ac.uk
Date : March 2019
Funders : European Union Seventh Framework Programme
DOI : 10.1021/acs.langmuir.8b04251
Grant Title : BARRIER-PLUS project
Copyright Disclaimer : Copyright © 2019 American Chemical Society
Depositing User : Clive Harris
Date Deposited : 04 Mar 2019 11:27
Last Modified : 20 Feb 2020 02:08
URI: http://epubs.surrey.ac.uk/id/eprint/850625

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