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Evolving stresses in latex films as a function of temperature
Huai Nyin Yow1, Itxaso Beristain, Monika Goikoetxea
1Department of Chemical Engineering and Biotechnology, BP Institute, University of Cambridge, Madingley Road, Cambridge CB3 0EZ, UK.
Langmuir : the ACS Journal of Surfaces and Colloids
|April 15, 2010
Summary
This study monitored latex film stress during drying using substrate deflection. Polymer rheology significantly impacts film formation, and the Stoney model is unreliable for high stresses.
Area of Science:
- Materials Science
- Polymer Science
- Surface Science
Background:
- Latex film formation is crucial for coatings and adhesives.
- Understanding film stress evolution during drying is essential for material performance.
- Polymer rheology influences the drying and mechanical properties of latex films.
Purpose of the Study:
- To investigate the evolution of film stress during latex drying.
- To examine the effect of polymer rheology on film formation at different temperatures.
- To evaluate the accuracy of the Stoney and Euler-Bernoulli models in predicting film stress.
Main Methods:
- Drying latex films on a flexible substrate.
- Monitoring substrate deflection over time to calculate film stress.
- Conducting experiments at temperatures below and above the minimum film-formation temperature.
- Analyzing the influence of temperature-dependent polymer rheology.
Main Results:
- An averaged film stress-evolution profile was obtained.
- Polymer rheology was found to significantly affect film formation.
- The linearized Stoney model proved inadequate for predicting higher film stresses.
- Comparison with the Euler-Bernoulli model provided insights into stress prediction limitations.
Conclusions:
- Film stress development during drying is complex and influenced by polymer rheology.
- The Stoney model requires careful consideration of stress magnitudes for accurate predictions.
- Further refinement of models is needed for precise stress analysis in latex films.
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