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Dilational lateral stress in drying latex films
Alexander M König1, Elodie Bourgeat-Lami, Véronique Mellon
1Institute of Physical Chemistry, Clausthal University of Technology, Arnold-Sommerfeld-Str. 4, D-38678 Clausthal-Zellerfeld, Germany.
Langmuir : the ACS Journal of Surfaces and Colloids
|February 12, 2010
Summary
Drying latex films develop tensile stress. A novel instrument revealed dilational stress during drying, linked to lateral liquid flow and particle network elasticity, potentially causing buckling.
Area of Science:
- Materials Science
- Fluid Dynamics
- Surface Science
Background:
- Drying latex films induce tensile stress due to volume reduction.
- Coatings can only shrink vertically, leading to substrate stress.
- Dilational stress development during drying was previously unobserved.
Purpose of the Study:
- Investigate the development of dilational stress in drying latex films.
- Understand the relationship between lateral liquid flow and stress distribution.
- Explore the mechanism leading to buckling in drying films.
Main Methods:
- Utilized an instrument to map stress distribution in drying latex films.
- Monitored in-plane stress by spreading latex dispersion on a flexible membrane.
- Observed film behavior, including membrane bending and lateral flow patterns.
Main Results:
- Dilational stress was observed in films exhibiting a strong coffee stain effect (significant lateral flow).
- Lateral flow results in particle consolidation at the film edge.
- Elastic recovery of the particle network after flow cessation causes lateral expansion and potential buckling.
Conclusions:
- Dilational stress is linked to lateral liquid flow during latex film drying.
- The interplay between lateral flow and elastic recovery of the particle network drives structure formation.
- This drying-induced structure formation mechanism is likely widespread due to common lateral flow phenomena.
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