Polymer thin film adhesion utilizing the transition from surface wrinkling to delamination

Son, Hyeyoung; Chau, Allison L.; Davis, Chelsea S.

doi:10.1039/c9sm01052a

Cited by 12 publications

(13 citation statements)

References 49 publications

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“…[44,45] The transitions between each of these modes is determined by the dimensions, mechanical properties, and interfacial properties of the substrate (in our case, the shrink film) and the sheet (which can be represented by the ultrathin device or the parylene sheet). Given the conditions of our system (large strain, good bonding, similar mechanical properties between shrink film and flexible sheet), only three of these modes-pure wrinkling, [46,47] wrinkling/ folding, [48,49] and mixed wrinkling/delamination [49,50] -apply (Figure 2B). These behaviors have been observed by many groups working with soft devices at the interface between flexible and stretchable materials.…”

Section: Resultsmentioning

confidence: 99%

Developing the Nondevelopable: Creating Curved‐Surface Electronics from Nonstretchable Devices

et al. 2021

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The incorporation of electronics onto curved surfaces promises to bring new levels of intelligence to the ergonomic, aesthetic, aerodynamic, and optical surfaces that are ever‐present in our lives. However, since many of these surfaces have 2D (i.e., nondevelopable) curvature, they cannot be formed from the deformation of a flat, nonstretchable sheet. This means that curved electronics cannot capitalize on the rapid technological advances taking place in the field of ultrathin electronics, since ultrathin devices, though ultraflexible, are not stretchable. In this work, a shrink‐based paradigm is presented to apply such thin‐film electronics to nondevelopable surfaces, expanding the capabilities of current nondevelopable electronics, and linking future developments in thin‐film technology to similar developments in curved devices. The wrinkling of parylene‐based devices and the effects of shrinkage on common electrical components are examined, culminating in shrinkable touch sensors and organic photovoltaics, laminated to various nondevelopable surfaces without loss of performance.

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Section: Resultsmentioning

confidence: 99%

Developing the Nondevelopable: Creating Curved‐Surface Electronics from Nonstretchable Devices

et al. 2021

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“…Thus, while we focused our study on delamination induced by uniaxial compression, we expect that the conceptual lesson drawn from our study, namely, the relevance of a bendability parameter to delamination phenomenology, applies also for other, more complicated systems, specifically the biaxial stresses associated with swelling or thermal expansion of polymer sheets on rigid [22][23][24] and deformable [31,32] substrates. Another notable example is the curvature-induced delamination of sheets from an adhesive substrate of a spherical shape, where compression is induced by geometrical incompatibility [15,17,18].…”

Section: Discussionmentioning

confidence: 99%

“…While a distinction between low-bendability and highbendability regimes, analogous to the one highlighted in our paper, may be relevant also for delamination from deformable substrates [5,[30][31][32], a thorough discussion of the various model systems is beyond the scope of our paper. Instead, let us consider only the specific case of a sheet floating on a liquid bath (where the GPE is governed by the liquid density ρ l rather than the mass of the sheet itself) under uniaxial compression [30,33,34].…”

Section: Delamination From a Liquid Bathmentioning

confidence: 92%

Rucks and folds: delamination from a flat rigid substrate under uniaxial compression

Davidovitch

Démery

2021

Eur. Phys. J. E

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We revisit the delamination of a solid adhesive sheet under uniaxial compression from a flat, rigid substrate. Using energetic considerations and scaling arguments we show that the phenomenology is governed by three dimensionless groups, which characterize the level of confinement imposed on the sheet, as well as its extensibility and bendability. Recognizing that delamination emerges through a subcritical bifurcation from a planar, uniformly compressed state, we predict that the dependence of the threshold confinement level on the extensibility and bendability of the sheet, as well as the delaminated shape at threshold, varies markedly between two asymptotic regimes of these parameters. For sheets whose bendability is sufficiently high the delaminated shape is a large-slope "fold", where the amplitude is proportional to the imposed confinement. In contrast, for lower values of the bendability parameter the delaminated shape is a small-slope "ruck", whose amplitude increases more moderately upon increasing confinement. Realizing that the instability of the fully laminated state requires a finite extensibility of the sheet, we introduce a simple model that allows us to construct a bifurcation diagram that governs the delamination process.

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“…Their tunable properties and easy moldability make them ideal candidates for stretchable and wearable electronics, 3,4 microfluidics, 4,5 biomaterials, 6–8 cosmetics, 1,9 and soft robotics 1,4,10–15 . Additionally, the ability to tune their mechanical and interfacial properties, combined with their commercial availability in simple, two‐part systems, make silicones useful for fundamental studies on soft materials, including but not limited to adhesion, 9,16–20 friction, 21–23 wetting, 24,25 cavitation, 26 wrinkling, 17,27–29 fracture, 22,26,30 and cell‐surface viability 8,14,31–33 . These elastomers mostly comprise polydimethylsiloxane (PDMS) and, in some cases, additional fillers such as nanoparticles 1,34,35 .…”

Section: Introductionmentioning

confidence: 99%

Modulus and adhesion of Sylgard 184, Solaris, and Ecoflex 00‐30 silicone elastomers with varied mixing ratios

Darby

Cai

Mason

et al. 2022

J of Applied Polymer Sci

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Two-part, commercial silicone elastomers are used in a variety of fundamental soft materials research and industrial applications due to their wide availability, ease of use, low cost, and mechanical tunability. This work seeks to create a library of moduli for three common elastomer systems with varied mixing ratios: Sylgard 184, Solaris, and Ecoflex 00-30, as well as provide a comparison of their adhesive properties. Shear storage moduli are quantified using parallel plate oscillatory shear rheology. The work of debonding is measured with spherical probe adhesion testing, and the static, advancing, and receding contact angles are measured via goniometer. Sylgard 184 can have shear moduli ranging from $0.5 kPa-620 kPa, Solaris from $0.6 kPa-175 kPa, and EF from $1.3 kPa-35 kPa measured at a frequency of 0.01 rad/s. In general, increasing mixing ratios creates softer samples. Additionally, softer samples are universally more adhesive, regardless of the material system. When comparing the different material systems, Sylgard 184 is generally the most adhesive, followed closely by Solaris, and then by Ecoflex 00-30. Our study offers a baseline dataset of modulus values and comparative adhesion to help researchers determine an appropriate commercial silicone for their application.

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Polymer thin film adhesion utilizing the transition from surface wrinkling to delamination

Abstract: A novel measurement technique is presented that utilizes the transition between surface buckling instabilities (wrinkles to delaminations) to simultaneously quantify the modulus of the film and adhesion of the film to the substrate.

Cited by 12 publications

References 49 publications

Developing the Nondevelopable: Creating Curved‐Surface Electronics from Nonstretchable Devices

Developing the Nondevelopable: Creating Curved‐Surface Electronics from Nonstretchable Devices

Rucks and folds: delamination from a flat rigid substrate under uniaxial compression

Modulus and adhesion of Sylgard 184, Solaris, and Ecoflex 00‐30 silicone elastomers with varied mixing ratios

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