(Press-News.org) The rapid advancements in flexible electronic technology have led to the emergence of innovative devices such as foldable displays, wearables, e-skin, and medical devices. These breakthroughs have created a growing demand for flexible adhesives that can quickly recover their shape while effectively connecting various components in these devices. However, conventional pressure-sensitive adhesives (PSAs) often face challenges in achieving a balance between recovery capabilities and adhesive strength. In an extraordinary study conducted at UNIST, researchers have successfully synthesized new types of urethane-based crosslinkers that address this critical challenge.
Led by Professor Dong Woog Lee from the School of Energy and Chemical Engineering at UNIST, the research team developed novel crosslinkers utilizing m-xylylene diisocyanate (XDI) or 1,3-bis(isocyanatomethyl)cyclohexane (H6XDI) as hard segments along with poly(ethylene glycol) (PEG) groups serving as soft segments. By incorporating these newly synthesized materials into pressure-sensitive adhesives, they achieved significantly improved recoverability compared to traditional methods.
The PSA formulated with H6XDI-PEG diacrylate (HPD) demonstrated exceptional recovery properties while maintaining high adhesion strength (~25.5 N 25 mm−1). Through extensive folding tests totaling 100k folds and multi-directional stretching tests spanning 10k cycles, the PSA crosslinked with HPD exhibited remarkable stability under repeated deformation—showcasing its potential for applications requiring both flexibility and recoverability.
Furthermore, even after subjecting the adhesive to strains up to 20%, it displayed high optical transmittance (>90%), making it suitable for fields such as foldable displays that demand not only flexibility but also optical clarity.
“This breakthrough in adhesive technology offers promising possibilities for electronic products that require both high flexibility and rapid recovery characteristics,” said Professor Lee. “Our research addresses the long-standing challenge of balancing adhesion strength and resilience, opening up new avenues for the development of flexible electronic devices.”
Hyunok Park, a researcher involved in the study, emphasized the significance of this research by stating, “The introduction of this new crosslinking structure has led to an adhesive with exceptional adhesion and recovery properties. We believe it will drive future advancements in adhesive research while contributing to further developments in flexible electronics.”
The study findings have been published ahead of their official publication in the online version of Advanced Functional Materials on July 12, 2023. This work was supported through the 2023 Research Fund at UNIST and received additional support from organizations including the National Research Foundation (NRF) of Korea, Defense Acquisition Program Administration and Ministry of Trade.
Journal Reference
Hyunok Park, Daegyun Lim, Geonwoo Lee, et al., “Tailoring Pressure Sensitive Adhesives with H6XDI-PEG Diacrylate for Strong Adhesive Strength and Rapid Strain Recovery,” Adv. Funct. Mater., (2023).
END
Researchers unveil new flexible adhesive with exceptional recovery and adhesion properties for electronic devices
The study findings have been published ahead of their official publication in the online version of Adv. Funct. Mater. on July 12, 2023
2023-09-19
[Attachments] See images for this press release:
ELSE PRESS RELEASES FROM THIS DATE:
Grant awarded to University of Louisville law professor will fund climate adaptation project
2023-09-19
The Resilience Justice Project (RJ Project) at the University of Louisville’s Brandeis School of Law has been awarded a one-year multi-institutional grant through a national competitive process to evaluate how climate adaptation planning can be more equitable for low-income communities in eight U.S. coastal areas.
The RJ Project will use the $75,000 award from the National Sea Grant Law Center through NOAA’s National Coastal Resilience Fund to examine coastal urban adaptation in the eight cities: Boston, Cleveland, Miami, New Orleans, San Diego, Savannah, Seattle and Tampa. Principal ...
Technological progress and climate change
2023-09-19
Technological progress can reduce the energy required to achieve the same ends, reducing the use of fossil fuels and the greenhouse gases associated with burning fossil fuels. But technological progress can also make production, consumption, and travel cheaper, stimulating demand and consequently increasing greenhouse gas emissions. Sai Liang and colleagues sought to explore this conundrum by building an environmentally extended general equilibrium model with heterogeneous agent and input-output network covering 141 nations and 65 sectors, ...
Yogurt may be the next go-to garlic breath remedy
2023-09-19
COLUMBUS, Ohio – It turns out yogurt may have a previously unknown benefit: eliminating garlic odors.
A new study conducted in a lab – with follow-up human breath tests being planned – showed that whole milk plain yogurt prevented almost all of the volatile compounds responsible for garlic’s pungent scent from escaping into the air.
Researchers tested the garlic deodorizing capacity of yogurt and its individual components of water, fat and protein to see how each stood up to the stink. Both fat and protein were effective at trapping garlic odors, leading the scientists to suggest high-protein ...
Laser-based ice-core sampling for studying climate change
2023-09-19
Researchers led by Yuko Motizuki from the Astro-Glaciology Laboratory at the RIKEN Nishina Center in Japan have developed a new laser-based sampling system for studying the composition of ice cores taken from glaciers. The new system has a 3-mm depth-resolution—about 3 times smaller than what is currently available—meaning that it can detect temperature variations that occurred over much smaller periods of time in the past. The new laser melting sampler, or LMS, is expected to help reconstruct continuous annual temperature changes that occurred thousands to hundreds of thousands of years ago, which will ...
Gene required for root hair growth, nitrate foraging found in grasses
2023-09-19
PULLMAN, Wash. -- Scientists have found a plant gene that drives the growth of root hairs, the tiny structures that help plants find water and nutrients in the soil.
Identified by a team led by Washington State University researcher Karen Sanguinet, the gene, dubbed “BUZZ,” causes faster-growing, denser webs of roots and may also determine how plants find and use nitrates, a prime source of nitrogen essential to plant growth. Nitrates are also used in fertilizers that can pollute the environment as runoff, and this genetic discovery could ultimately help plant scientists find ways to grow crops more sustainably.
“Nitrate ...
Job strain combined with high efforts and low reward doubled men’s heart disease risk
2023-09-19
Research Highlights:
Men exposed to stressful working conditions who also felt that they put forth high effort but received low reward had twice the risk of heart disease compared to men who were free of those psychosocial stressors.
The impact of job strain and effort-reward imbalance combined was similar to the magnitude of the impact of obesity on the risk of coronary heart disease, in the study of nearly 6,500 white-collar workers in Canada.
Results on how work stress affects women’s heart health were inconclusive.
Embargoed ...
Breaking in the black box of pedagogical authority
2023-09-19
How does pedagogical authority operate in the classroom? A team from the University of Geneva (UNIGE) and the University of Teacher Education, State of Vaud (HEP Vaud) has produced one of the first in-depth field studies on this subject. By filming teachers in training over a period of several months, the researchers identified different ways of exercising teaching authority and assessed their effectiveness. They found that strategies based on double addressing - i.e. addressing several students or groups of students simultaneously, using two different communication channels - were particularly effective. These results ...
Witchcraft accusations an ‘occupational hazard’ for female workers in early modern England
2023-09-19
While both men and women have historically been accused of the malicious use of magic, only around 10–30% of suspected witches were men by the 16th and 17th centuries.*
This bias towards women is often attributed to misogyny as well as economic hard times. Now, a Cambridge historian has added another contributing factor to the mix.
Dr Philippa Carter argues that the types of employment open to women at the time came with a much higher risk of facing allegations of witchcraft, or maleficium.
In a study published in the journal Gender & History, Carter uses the casebooks of Richard ...
China global Merged Surface Temperature dataset (CMST) reveals 2023 on Track to Be Hottest Year Ever
2023-09-19
The climate crisis is reaching unprecedented levels of urgency as global temperatures soar to record-breaking heights, with July 2023 marking another alarming milestone. United Nations Secretary-General António Guterres declared it a "disaster for the whole planet," emphasizing that the era of "global warming" has given way to an era of "global boiling." This alarming assessment is supported by recent findings from Professor Qingxiang Li 's team at the School of Atmospheric ...
Moderate to vigorous physical activity early in the day influences weight management, health outcomes
2023-09-19
ROCKVILLE, Md.—Even though epidemiological evidence has been controversial regarding the optimal timing of physical activity for weight management, the hours of 7 a.m. to 9 a.m. appear to be the most favorable time of day to enhance the association between daily moderate to vigorous physical activity and obesity, according to a new analysis published in Obesity, The Obesity Society’s (TOS) flagship journal.
“Our study provided a novel tool to explore the diurnal pattern of physical activity and to investigate its impact on health outcomes,” said Tongyu Ma, PhD, assistant professor, Health Sciences Department, Franklin Pierce University, Rindge, ...
LAST 30 PRESS RELEASES:
Fentanyl detection through packaging
Prof. Eran Meshorer elected to EMBO for pioneering work in epigenetics
New 3D glacier visualizations provide insights into a hotter Earth
Creativity across disciplines
Consequences of low Antarctic sea ice
Hear here: How loudness and acoustic cues help us judge where a speaker is facing
A unique method of rare-earth recycling can strengthen the raw material independence of Europe and America
Epilepsy self-management program shows promise to control seizures, improve mood and quality of life
Fat may play an important role in brain metabolism
New study finds no lasting impact of pandemic pet ownership on human well-being
New insights on genetic damage of some chemotherapies could guide future treatments with less harmful side effects
Gut microbes could protect us from toxic ‘forever chemicals’
Novel modelling links sea ice loss to Antarctic ice shelf calving events
Scientists can tell how fast you're aging from a single brain scan
U.S. uterine cancer incidence and mortality rates expected to significantly increase by 2050
Public take the lead in discovery of new exploding star
What are they vaping? Study reveals alarming surge in adolescent vaping of THC, CBD, and synthetic cannabinoids
ECMWF - delivering forecasts over 10 times faster and cutting energy usage by 1000
Brazilian neuroscientist reveals how viral infections transform the brain through microscopic detective work
Turning social fragmentation into action through discovering relatedness
Cheese may really be giving you nightmares, scientists find
Study reveals most common medical emergencies in schools
Breathable yet protective: Next-gen medical textiles with micro/nano networks
Frequency-engineered MXene supercapacitors enable efficient pulse charging in TENG–SC hybrid systems
Developed an AI-based classification system for facial pigmented lesions
Achieving 20% efficiency in halogen-free organic solar cells via isomeric additive-mediated sequential processing
New book Terraglossia reclaims language, Country and culture
The most effective diabetes drugs don't reach enough patients yet
Breast cancer risk in younger women may be influenced by hormone therapy
Strategies for staying smoke-free after rehab
[Press-News.org] Researchers unveil new flexible adhesive with exceptional recovery and adhesion properties for electronic devicesThe study findings have been published ahead of their official publication in the online version of Adv. Funct. Mater. on July 12, 2023