Polyurethane acrylate improves the elongation recovery of pressure-sensitive adhesives
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Polyurethane acrylate improves the elongation recovery of pressure-sensitive adhesives – A new study shows how polyurethane acrylate (PUA) as a crosslinking agent significantly accelerates the stress recovery of pressure-sensitive adhesives (PSA). This opens up new possibilities for flexible electronics.
Pressure-sensitive adhesives (PSAs) are important in many industries, including electronics, automotive, healthcare and packaging, as they can adhere to surfaces without the use of heat, solvents or additional processing. However, a major drawback of these adhesives is their low stress recovery, which is problematic for flexible electronic applications. A new study investigates how polyurethane diacrylate (PUDA) as a crosslinking agent significantly improves the stress recovery of pressure-sensitive adhesives.
Faster strain recovery
The results show that PSAs with PUDA achieve full recovery significantly faster. While conventional pressure-sensitive adhesives crosslinked with 1,6-hexanediol diacrylate (HDDA) require a recovery time of around 61 seconds, the recovery time of PUDA-based adhesives is only around 2.5 seconds. Due to this fast recovery, PUDA-based pressure-sensitive adhesives are particularly suitable for applications under extreme load conditions, such as those found in flexible electronic devices.
Improved adhesion and long-term stability
In addition to rapid strain recovery, the PUDA PSA also demonstrated an excellent 180° peel force of approximately 22.0 N per 25 mm, which is significantly higher than that of a commercial PSA which is approximately 12.3 N per 25 mm. These properties were confirmed in extensive testing with 100 cycles of loading at 20%, with the PUDA-based PSAs maintaining their performance over multiple cycles.
Valuable insights
This study provides valuable insights into how to improve the stress recovery of pressure sensitive adhesives and lays the foundation for the further development of adhesive technologies needed for flexible and highly durable applications in the electronics industry in the future.
Event tip
On March 20, 2025, the online EC short course “Polyurethane Coatings” will address the high performance and versatility of polyurethane coatings widely used in the automotive, aerospace and construction industries. The course covers key raw materials, crosslinking methods and coating types, including solvent and water-based systems, blocked isocyanates and UV-curable polyurethanes. In addition, the course will discuss how bio-based and circular raw materials are shaping the industry’s movement towards sustainability. Discover how these innovations enable formulators to achieve optimal coating properties.
European Coatings Show 2025
The biennial ECS conference will take place from March 25-27, 2025 in Nuremberg, Germany. This event offers everything you need to stay at the forefront of your field. Experts from all over the world come together to present developments, participate in debates and exchange valuable information.
Siam Software is present
Siam Software for Safety Sheets will also be present at ECS 2025 (Hall 3, Stand 3-663). For almost twenty years, Siam has been developing advanced software that enables suppliers of hazardous chemicals to easily create safety data sheets (SDS or MSDS) and labels. Our innovative approach and the excellent support we provide help companies in the chemical industry to meet regulatory requirements.
Constantly evolving software
Thanks to partnerships with leading institutions in the chemical industry, Siam ensures that our software continuously grows with the changing legislation and requirements of chemical manufacturers. Online training keeps our customers informed of new legislation and updates to our software.
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With an international network of representatives, we support customers in more than 50 countries. The growing community of Chemeter users with more than 1,000 satisfied customers worldwide is a testament to our success and commitment to quality.
Meet us at the ECS 2025
Would you like to meet us at the European Coatings Show in Nuremberg (Hall 3, Stand 3-663) or would you like a free, no-obligation demonstration of our software? Send an e-mail to demo@european-coatings-show.eu and let us know which day and time suits you best. We look forward to meeting you!
Source: European Coatings
Also read: Discover coating industry innovations during European Coatings Show 2025
Also read: ECHA criticizes quality of safety data sheets
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