High-adhesion PDMS/Ag conductive composites for flexible hybrid integration

Tang, Miao; Jiang, Zhuo; Wang, Zekai; Qin, Yajie; Jiang, Yizhou; Wu, Limin; Li, Zhuo

doi:10.1016/j.cej.2022.138730

Cited by 15 publications

(5 citation statements)

References 52 publications

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“…[254] Yet, their low surface energy and limited reactive functional groups lead to weak bonding with other devices, adversely impacting the functionality of stretchable devices. [255] PDMS also serves as the fundament in microfluidics, [256][257][258][259][260][261][262][263][264] where microchannels can form a chip bonded to solid or flexible substrates, such as polyethylene terephthalate, [265] polyimide, [266] PMMA, [267] polyvinyl chloride, [268] and polycarbonate, [269] via high strength, quality bonding. In addition, PDMS can act as a substrate for enclosing PDMS microchannels, [270] with surface activation achieved via oxygen plasma [271] and corona treatment processes.…”

Section: Modification Approach Wca (°) S L I D E Angle (°) Featured A...mentioning

confidence: 99%

Functional PDMS Elastomers: Bulk Composites, Surface Engineering, and Precision Fabrication

Li,

Zhang,

et al. 2023

Advanced Science

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Polydimethylsiloxane (PDMS)—the simplest and most common silicone compound—exemplifies the central characteristics of its class and has attracted tremendous research attention. The development of PDMS‐based materials is a vivid reflection of the modern industry. In recent years, PDMS has stood out as the material of choice for various emerging technologies. The rapid improvement in bulk modification strategies and multifunctional surfaces has enabled a whole new generation of PDMS‐based materials and devices, facilitating, and even transforming enormous applications, including flexible electronics, superwetting surfaces, soft actuators, wearable and implantable sensors, biomedicals, and autonomous robotics. This paper reviews the latest advances in the field of PDMS‐based functional materials, with a focus on the added functionality and their use as programmable materials for smart devices. Recent breakthroughs regarding instant crosslinking and additive manufacturing are featured, and exciting opportunities for future research are highlighted. This review provides a quick entrance to this rapidly evolving field and will help guide the rational design of next‐generation soft materials and devices.

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Section: Modification Approach Wca (°) S L I D E Angle (°) Featured A...mentioning

confidence: 99%

Functional PDMS Elastomers: Bulk Composites, Surface Engineering, and Precision Fabrication

Li,

Zhang,

et al. 2023

Advanced Science

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“…On the other hand, another strategy is to make flexible CVFs from “elastomers” to “viscoelastomers.” Silicone-based PSAs − are suitable for fabricating flexible display CVFs from “elastomers” due to their low T g , low elastic modulus, thermal stability, and excellent optically clear performance. Soft elastomers based on silicone polymers have been applied in many flexible applications, such as wearable electronic devices, , artificial muscles, soft robotics, sensors, etc. In general, most silicone PSAs are essentially dispersion of silanol functional polymers (vinyl functional silicone polymers are usually cured via the hydrosilylation reaction), silanol functional cross-linkers, and functional/nonfunctional MQ siloxane resin in a hydrocarbon solvent, most commonly in toluene or xylene.…”

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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“…To improve the adhesion performance of PDMS elastomers, additives such as adhesion promoters (e.g., silane molecules) are added to the formulation. 14,15 These silane molecules typically have head groups and end groups that may react with other materials. Typically, the head groups of a silane molecule consist of three methoxy, ethoxy, or chloride groups.…”

Section: Introductionmentioning

confidence: 99%

Molecular behavior of silicone adhesive at buried polymer interface studied by molecular dynamics simulation and sum frequency generation vibrational spectroscopy

Wu,

Lin,

Santos

et al. 2024

Soft Matter

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High-adhesion PDMS/Ag conductive composites for flexible hybrid integration

Cited by 15 publications

References 52 publications

Functional PDMS Elastomers: Bulk Composites, Surface Engineering, and Precision Fabrication

Functional PDMS Elastomers: Bulk Composites, Surface Engineering, and Precision Fabrication

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

Molecular behavior of silicone adhesive at buried polymer interface studied by molecular dynamics simulation and sum frequency generation vibrational spectroscopy

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