Pressure sensitive adhesive (PSA) consists mainly of tacky polymeric materials that adhere to a solid substrate upon applying a contact pressure and is one of the promising candidates for various future applications. To accelerate the application of PSA, especially to a tiny piece of material, the structure and physical properties at various size scales must be well understood. To that end, we examined local rheological properties of a random copolymer composed of n-butyl acrylate and 2-hydroxyethyl acrylate, poly(BA-r-HEA), which was a representative for polyacrylic PSAs by a particle tracking technique with nanometer-scaled particles of quantum dots (QD) as a probe. The observation for individual QDs at different locations was found to be heterogeneous as the time scale was shorter than the terminal relaxation of poly(BA-r-HEA) chains. Being aware of the appearance and disappearance of the heterogeneity will lead to the optimization of the usage process and the molecular design of PSA with improved performance.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Organic Chemistry
- Polymers and Plastics
- Materials Chemistry