Ambient air-operated thermo-switchable adhesion of <i>N</i>-isopropylacrylamide-incorporated pressure sensitive adhesives

Hwang, Jeonguk; Lim, Daegyun; Lee, Geonwoo; Kim, Young Eun; Park, Jintae; Baek, Myung Jin; Kim, Hak-Sun; Park, Keum Hwan; Ku, Kang Hee; Lee, Dong Woog

doi:10.1039/d3mh00419h

Cited by 9 publications

(3 citation statements)

References 56 publications

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“…Nevertheless, it is important to highlight that despite this slight decrease, the peel strength remains sufficient for the effective utilization of the OCA in foldable applications. To assess the high- and low-temperature reliability of the UV-blocking OCA film, we examined the viscoelastic behaviours of the OCA film across various temperatures 74 . The storage modulus ( G ʹ), loss modulus ( G ʺ), and damping factor (tan δ ) were measured by a rheometer through a dynamic temperature sweep ranging from −50 °C to 90 °C (Supplementary Table 12 ).…”

Section: Resultsmentioning

confidence: 99%

Ultraviolet light blocking optically clear adhesives for foldable displays via highly efficient visible-light curing

Kwon,

Lee,

Kim

et al. 2024

Nat Commun

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In developing an organic light-emitting diode (OLED) panel for a foldable smartphone (specifically, a color filter on encapsulation) aimed at reducing power consumption, the use of a new optically clear adhesive (OCA) that blocks UV light was crucial. However, the incorporation of a UV-blocking agent within the OCA presented a challenge, as it restricted the traditional UV-curing methods commonly used in the manufacturing process. Although a visible-light curing technique for producing UV-blocking OCA was proposed, its slow curing speed posed a barrier to commercialization. Our study introduces a highly efficient photo-initiating system (PIS) for the rapid production of UV-blocking OCAs utilizing visible light. We have carefully selected the photocatalyst (PC) to minimize electron and energy transfer to UV-blocking agents and have chosen co-initiators that allow for faster electron transfer and more rapid PC regeneration compared to previously established amine-based co-initiators. This advancement enabled a tenfold increase in the production speed of UV-blocking OCAs, while maintaining their essential protective, transparent, and flexible properties. When applied to OLED devices, this OCA demonstrated UV protection, suggesting its potential for broader application in the safeguarding of various smart devices.

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Section: Resultsmentioning

confidence: 99%

Ultraviolet light blocking optically clear adhesives for foldable displays via highly efficient visible-light curing

Kwon,

Lee,

Kim

et al. 2024

Nat Commun

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“…Pressure sensitive adhesives (PSAs) can rapidly adhere to surfaces at room temperature with the application of a low pressure. − This feature distinguishes PSAs from other types of adhesives, such as liquid glues that solidify after a chemical reaction or hot-melt adhesives that become tacky when melted and then harden upon cooling to room temperature . Owing to their ease of use and ability to rapidly adhere to a wide range of substrates, PSAs are commonly used in various applications, including tapes, labels, stickers, and medical dressings. − The global market for PSAs exceeded USD 8.3 billion in 2022 and is projected to achieve a compound annual growth rate of 6% over the next decade, which is attributed to the increasing utilization of tapes and labels in automotive and transportation applications. , For example, PSAs are extensively used in various automobile parts, such as the exterior and interior trim, bonnet, and body.…”

Section: Introductionmentioning

confidence: 99%

Styrenic Block Copolymer-Based Pressure Sensitive Adhesives without Volatile Compounds Using Organic Eutectic Liquid

Choi,

Wooh,

Kim

2023

ACS Appl. Polym. Mater.

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Pressure sensitive adhesives (PSAs) based on styrenic block copolymers are commonly used in daily life and industry applications owing to their ability to rapidly adhere to surfaces with the application of low pressure at room temperature. Because of rising environmental issues, the demand for ecofriendly PSAs has considerably increased. In this regard, a nonvolatile organic eutectic liquid (EL) was developed as a substitute for the volatile organic diluent and tackifier, which are conventional components of PSAs. The poly(styrene-bbutadiene-b-styrene) (SBS) block copolymer was used as a model base polymer. The substitution of the diluent and tackifier by the EL considerably simplifies the PSA preparation process by eliminating the need for solution casting and solvent recovery steps. Additionally, it ensures the safety of manufacturers and users as the use of volatile and toxic components is avoided. Owing to the chemical structure similarity, the EL preferentially plasticized the polystyrene block, effectively increasing tackiness and enhancing damping properties at room temperature even at relatively low EL loadings (≤30 wt %). By simply incorporating EL into the SBS matrix, lap shear strength could be enhanced by 524% at most. Moreover, the use of the EL renders the SBS-based PSA particularly suitable for applications under rapid-shear conditions.

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“…Smart adhesive surfaces with switchable adhesion have gained significant research attention owing to their high potential for use in various applications, including sensors, , soft grippers, and robots. , These surfaces exhibit strong adhesion and can be selectively detached in response to specific external stimuli such as UV light, magnetic field, electric field, or thermal stimuli, , inducing changes in contact area, mechanical properties, or near-interface properties. For example, gecko-inspired adhesion microstructures have been developed by using photoresponsive liquid crystals .…”

Section: Introductionmentioning

confidence: 99%

Triple-Bioinspired Shape Memory Microcavities with Strong and Switchable Adhesion

Li,

Liu,

Wang

et al. 2023

ACS Nano

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Ambient air-operated thermo-switchable adhesion of N-isopropylacrylamide-incorporated pressure sensitive adhesives

Abstract: Owing to the rise in global population and living standards, waste treatment has inevitably become a critical issue for a sustainable environment. In particular, for an effective recycling process, it...

Cited by 9 publications

References 56 publications

Ultraviolet light blocking optically clear adhesives for foldable displays via highly efficient visible-light curing

Ultraviolet light blocking optically clear adhesives for foldable displays via highly efficient visible-light curing

Styrenic Block Copolymer-Based Pressure Sensitive Adhesives without Volatile Compounds Using Organic Eutectic Liquid

Triple-Bioinspired Shape Memory Microcavities with Strong and Switchable Adhesion

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