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WATCHING PAINT DRY WITH PASSIVE MICRORHEOLOGY

Varghese, Selwin M
http://rave.ohiolink.edu/etdc/view?acc_num=csu1515166655147116

Abstract Details

2017, Master of Science in Chemical Engineering, Cleveland State University, Washkewicz College of Engineering.
Coatings are complex fluids that are present in every aspect of our lives, and are primarily used to protect and decorate materials, such as automobiles, houses, and industrial structures. The U.S automotive coating industry is expected to have revenues of $3.5 billion by 2025, according to a report by Global Market Insights1. The drying step in the coating application process is crucial to creating a well performing product. For paints used in automobiles, drying involves a “flash” stage after which the product is cured. During flash, solvent evaporation occurs in paints exposed to the atmosphere. Paint remains fluidic for a portion of the flash step and semi-solid for the remaining portion, thereby allowing defects to form and solidify during flash. The rheological properties, and how these properties relate to flows during drying, are crucial to controlling defect formation during flash and ultimate performance of the coating. This work studies the transient rheological behavior of a drying thin film of paint during flash. We used passive microrheology to probe both steady (non-drying) and unsteady (drying) conditions and determined how parameters such as film thickness affect the properties of the film. We found that microrheology can be conducted in both clear and cloudy coatings, using fluorescent micro particles. An algorithm was developed to account for convection while drying. Drying behavior could be observed from the decrease in logarithmic slopes of the mean squared displacement (MSD), which indicated an increase in viscosity over the course of the drying period. Using a confocal microscope, non-drying and drying measurements were conducted in 3D. And finally it was discovered that drying could be observed as a function of film thickness for 100 and 150µm wet films.
Christopher Wirth, Ph.D. (Committee Chair)
Nolan Holland, Ph.D. (Committee Member)
Andrew Resnick, Ph.D. (Committee Member)
Chemical Engineering
Microrheology

Recommended Citations

Citations

  • Varghese, S. M. (2017). WATCHING PAINT DRY WITH PASSIVE MICRORHEOLOGY [Master's thesis, Cleveland State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=csu1515166655147116

    APA Style (7th edition)

  • Varghese, Selwin. WATCHING PAINT DRY WITH PASSIVE MICRORHEOLOGY . 2017. Cleveland State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=csu1515166655147116.

    MLA Style (8th edition)

  • Varghese, Selwin. "WATCHING PAINT DRY WITH PASSIVE MICRORHEOLOGY ." Master's thesis, Cleveland State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=csu1515166655147116

    Chicago Manual of Style (17th edition)

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This open access ETD is published by Cleveland State University and OhioLINK.