Jump to main content
Jump to site search

Cracking in drying films of polymer solutions

Author affiliations


Thin films of polymer coatings have important industrial applications ranging from paints and coatings to pharmaceuticals. In many applications, the coatings are obtained by applying thin films of dilute polymer solutions, wherein the solvent evaporates to leave behind a thin polymer film. In some cases, the thin films may crack due to shrinkage stresses developed during drying. While a number of studies have focused on the stress development, the phenomenon of cracking in polymer films is not fully investigated. In the present work, thin films of a silicone polymer solution were cast on substrates of varying Young's moduli and investigated for cracking as a function of film thickness and substrate modulus. Micro-Raman spectroscopy measurements show that thin films dry uniformly while thick films form a skin at the top surface leading to slow drying rates. Transverse stresses were measured using the cantilever technique and related to the extent of cracking in the film. We investigated the influence of substrate rigidity on the cracking behavior and found that decreasing the stiffness of the substrate increases the extent of cracking.

Graphical abstract: Cracking in drying films of polymer solutions

Back to tab navigation

Article information

21 Nov 2019
24 Feb 2020
First published
24 Feb 2020

Soft Matter, 2020, Advance Article
Article type

Cracking in drying films of polymer solutions

B. S. Tomar, A. Shahin and M. S. Tirumkudulu, Soft Matter, 2020, Advance Article , DOI: 10.1039/C9SM02294E

Social activity

Search articles by author