Document Type
Article
Publication Date
11-15-2021
Publication Title
Journal of Polymer Science
Abstract
Polymer coatings are frequently used to modify surface properties of inorganic substrates. However, the disparity in physical properties between polymer film and substrate often leads to residual stress development, which can be deleterious to the overall performance of coated materials. This work reports the molecular design of polymer films that dissipate stress upon irradiation with ultraviolet (UV) light. These polymers are synthesized by post-polymerization modification of the reactive polymer, poly(2-vinyl-4,4-dimethyl azlactone), to introduce dynamic crosslinks capable of light-initiated addition transfer fragmentation chemistry. Using a custom-built optical cantilever, contrasting film stress responses are observed between films containing dynamic bonds and analogous control films after UV light irradiation, which indicate successful stress relaxation. Further experiments demonstrate the complete relaxation of residual stress in dynamic films after an extended exposure, thereby generating a “stress-free” film. Films fabricated using this approach can be easily tailored to incorporate additional moieties to introduce desired surface properties for future application in a wide array of coatings.
Keywords
azlactone, dynamic covalent bond, polymer coating, residual stress, stress relaxation
Volume
59
Issue
22
First Page
2719
Last Page
2729
DOI
10.1002/pol.20210464
ISSN
26424150
Rights
© 2021 Wiley Periodicals LLC
Recommended Citation
Mineo, Autumn M.; Buck, Maren E.; and Katsumata, Reika, "Molecular Design of Polymer Coatings Capable of Photo-Triggered Stress Relaxation via Dynamic Covalent Bond Exchange" (2021). Chemistry: Faculty Publications, Smith College, Northampton, MA.
https://scholarworks.smith.edu/chm_facpubs/22
Comments
Archived as published. Open access article.