Optical Adhesives: Analysis, Achievements, and Trends in Development

Stroganov, V. F.; Серова, В Н

doi:10.1134/s1995421219040178

Cited by 3 publications

(4 citation statements)

References 19 publications

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“…Acrylic copolymers make up the majority of reported and marketed CVF materials due to their high adhesive strength, exceptional optical clarity, UV resistance, excellent aging property, etc. − Given their inherent soft structure and high adhesive strength, acrylic PSAs have been investigated for use in flexible display CVFs by adjusting their molecular weight and cross-linking density, , blending them with other elastomers, , inducing functional monomers, , filling nanoparticles, using UV patterning techniques, , building IPN structures, etc.…”

Section: Introductionmentioning

confidence: 99%

Clear Viscoelastic Film Based on Low-Hard-Segment Silicone Polyurea Elastomers for Flexible Display Applications

Qin,

Wang,

Xia

2024

ACS Appl. Polym. Mater.

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A clear viscoelastic film (CVF) plays a critical role in bonding different components in a display module. The recent flexible display application calls for a CVF with balanced viscoelasticity by integrating many combined material properties, such as high optical clarity, high adhesion, low glass transition temperature, low elastic modulus, and high recovery performance. In particular, a low glass transition temperature (T g ) is essential to achieve flexibility over a wide range of temperatures (i.e., −20 to 80 °C). Silicone polymers are an important class of elastomers with T g below −100 °C and are expected to exhibit unique properties as CVF candidates in flexible display applications. In this report, silicone polyurea (SPU) elastomers with low hard segments were fi r s t s y n t h e s i z e d u s i n g α , ω -b i s ( a m i n o p r o p y l ) p o l y -(dimethylsiloxanes) and different diisocyanates. Interestingly, these silicone polyurea elastomers exhibited good elasticity despite a small quantity of bidentate hydrogen bonds. SPU CVF was then prepared by blending tackifier that hydrolytic condensation products of monofunctional silane (M) and tetrafunctional silane (Q) (MQ resin) at different ratios to adjust the viscoelastic properties. Specifically, blending an equal weight of methyl MQ resin could simultaneously achieve an optimum balance of high clarity (transmittance above 94%, haze lower than 1%), low elastic modulus (30 kPa at room temperature), low working temperature limit (T g approximately −20 °C), decent peel adhesion (6.9 N/25 mm), good stress relaxation (71.43%), and high recovery (80%) at large strain (500 and 1000%). Moreover, the optimal sample could withstand 200 000 successive folding−unfolding tests without any cracking or delamination. The results revealed that the SPU-based viscoelastomers could function as CVFs for flexible display applications.

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Section: Introductionmentioning

confidence: 99%

Clear Viscoelastic Film Based on Low-Hard-Segment Silicone Polyurea Elastomers for Flexible Display Applications

Qin,

Wang,

Xia

2024

ACS Appl. Polym. Mater.

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“…Acrylic PSAs have been widely used in display, electronics, and automobile industries due to their good optical properties, high weathering resistance, robust adhesion, and facile modification. − Additionally, acrylic polymers can be conveniently prepared by radical polymerization, which is commonly practiced in industry . Acrylic CVF for flexible displays has been previously reported. ,− For example, Park et al .…”

Section: Introductionmentioning

confidence: 99%

Highly Stretchable, Soft, and Clear Viscoelastic Film with Good Recoverability for Flexible Display

Fang

Xia

2022

ACS Appl. Mater. Interfaces

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The advancement of flexible electronic devices has prompted new material development for the display application. For flexible display, a suitable clear viscoelastic film (CVF) is essential to bond different layers in a display stack in order to improve the visualization and durability during the repeated folding process. However, it is challenging to integrate different properties in the CVF by overcoming many contradictory requirements, such as low modulus/glass transition temperature (T g ) and high adhesion or high recoverability and good stress−relaxation. In this work, a CVF was prepared using an interpenetrating polymer network (IPN) with bimodal chain length distribution, and it exhibited several favorable properties. The bimodal elastomer was composed of short-chain polyurethane (PU) and long-chain polyacrylate. The long-chain polyacrylate network provided a large amount of entanglement that conferred stretchability, adhesion, and stress−relaxation, whereas the short PU chain network acted as an entropy spring and contributed mostly to the recoverability. The experimental data suggested the presence of a hydrogen-bonding interaction and interlocked polymer chains between the two networks. When the components of the IPN are adjusted, the CVF can simultaneously achieve good stress−relaxation, high strain recovery at large strain (1000%), high toughness, clarity, and adhesion. Moreover, the CVF displayed low glass transition temperature (−57 °C) and low storage modulus (20 to 30 kPa at room temperature). To the best of our knowledge, this is the first report using the IPN concept to prepare a CVF with well-balanced properties.

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“…[14][15][16] Incorporation to these mechanisms, the acrylic-based PSAs have excellent adhesion with polymer and glass surfaces, highest transparency, good water resistance, and excellent resistance to weatherability. [17][18][19] Despite having such ideal properties, acrylic-based adhesive lack in the selection of the crosslinkers and flame retardancy. A strong adhesive force with the substrate comes from the strong, cohesive force present within the polymeric chain and thus to induce that the crosslinking of the acrylic group is essential.…”

Section: Introductionmentioning

confidence: 99%

“…All of these properties required for optically clear PSAs can be acquired by various chemical mechanisms such as acrylics, epoxy, silicone, and other aliphatic polyethers 14‐16 . Incorporation to these mechanisms, the acrylic‐based PSAs have excellent adhesion with polymer and glass surfaces, highest transparency, good water resistance, and excellent resistance to weatherability 17‐19 . Despite having such ideal properties, acrylic‐based adhesive lack in the selection of the crosslinkers and flame retardancy.…”

Section: Introductionmentioning

confidence: 99%

Incorporation of flame retardancy in bio‐resourced mannitol based curing agent for clear pressure‐sensitive adhesive

Gadgeel

Mhaske

2020

Polymers for Advanced Techs

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Highlights • Research involves the preparation of phosphorus modified curing agents of biobased resources and understand in the application in the clear pressure-sensitive adhesive. • A bio-based curing agent has synergic behavior of flame retardancy. • The use of a bio-based curing agent imparts thermal stability in the adhesive. • The presence of phosphorus in the structure allows the formation of intumescent char.

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Optical Adhesives: Analysis, Achievements, and Trends in Development

Cited by 3 publications

References 19 publications

Clear Viscoelastic Film Based on Low-Hard-Segment Silicone Polyurea Elastomers for Flexible Display Applications

Clear Viscoelastic Film Based on Low-Hard-Segment Silicone Polyurea Elastomers for Flexible Display Applications

Highly Stretchable, Soft, and Clear Viscoelastic Film with Good Recoverability for Flexible Display

Incorporation of flame retardancy in bio‐resourced mannitol based curing agent for clear pressure‐sensitive adhesive

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