UV curing/cross-linking of acrylic polymer thin film (< 1 micron) may generate mechanical stress within the coating. Is there any experimental or theoretical method that can detect and describe these stresses?
Hi Yang
Deposit the film on a slither of glass, which will bend after deposition. Use the bend to assess the stress as in, for example, the following reference.
TIME EVOLUTION OF THE RESIDUAL-STRESS OF PLASMA-POLYMERIZED ACETYLENE FILMS IN VARIOUS AMBIENTS
Author(s): SHIOSAWA, T (SHIOSAWA, T); DEMORAES, MAB (DEMORAES, MAB); SCARMINIO, J (SCARMINIO, J) Source: JOURNAL OF APPLIED PHYSICS Volume: 70 Issue: 9 Pages: 4883-4889 DOI: 10.1063/1.349031 Published: NOV 1 1991
Best wishes, Steven Durrant
Residual stresses in thin polymer films cause rupture and dominate early stages of dewetting. Please read the attachment J. Appl. Phys 70 (1991) 4883-4889
There a method describe in my paper that is a Raman modes studies on diferent Films thickness.
Adding to Irene's answer, measure substrate curvature before and after deposition of thin film, stress in the film can be calculated from the curvature data using Stoney equation. Curvature measurement can be performed using surface profiler.
I hope this could help.
Nanoindentation and nanoscratch tests are best techniques to measure the residual stresses.
For more details, go through below links.
http://onlinelibrary.wiley.com/doi/10.1002/app.43532/full
http://www.sciencedirect.com/science/article/pii/S0032386116301227
- Badges
- Science topic
- Similar topics
- Chemistry
- Nanotechnology
- Nanostructures
- Thin Films