Switching “on” and “off” the adhesion in stimuli-responsive elastomers

Kaiser, Simon; Radl, Simone; Manhart, Jakob; Ayalur-Karunakaran, Santhosh; Grießer, Thomas; Möser, Andreas; Ganser, Christian; Teichert, Christian; Kern, Wolfgang; Schlögl, Sandra

doi:10.1039/c8sm00284c

Cited by 40 publications

(32 citation statements)

References 42 publications

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“…One wall is then moved parallel to the other until failure occurs. 20 [132] 50 [182] 21 [112] 51 [56] 22 [125] 52 [60] 23 [128] 53 [66] 24 [131] 54 [184] 25 [144] 55 [198] 26 [101] 56 [74] 27 [80] 57 [87] 28 [142] 58 [67] 29 [143] 59 [86] 30 [136] 60 [98] [230] Of course, variations from our assumptions require more complex analysis.…”

Section: A4 Shearmentioning

confidence: 99%

Switchable Adhesives for Multifunctional Interfaces

Croll

Hosseini

Bartlett

2019

Adv Materials Technologies

132

107

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The reliable bonding or attachment of materials is critical in many industries, is a common necessity of daily life, and is key to functionality in numerous biological settings. [1][2][3][4][5][6][7][8][9][10][11] Adhesives Joining two materials with an adhesive is an extremely common activity, but is most often irreversible. However, emerging and current applications ranging from consumer and medical products to soft robotics and wearable bio-monitoring devices demand strong adhesives which can be easily removed on-demand and subsequently reused. This requires new paradigms in adhesive science and engineering, resulting in the emergence of new classes of multifunctional switchable adhesives. Here summarized is the current state of the art in switchable adhesive systems, focusing on how devices fit into the basic science of adhesion while providing performance metrics for comparison across current approaches. Using fracture mechanics as a guide, systems are classified as functioning under one of three basic mechanisms: near-interface, contact area, or mechanical. These mechanisms must be initiated or "triggered" by a specific input, which can include mechanical, electromagnetic, fluidic, or thermal stimuli. Triggers and adhesion switching performance are compared through the use of a "switching ratio," the interfacial energy release rate, and an estimate of mechanism timing. Finally, it is discussed that how the fundamental mechanisms relate to challenges and opportunities for switchable interfaces in future applications and adhesive systems.

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Section: A4 Shearmentioning

confidence: 99%

Switchable Adhesives for Multifunctional Interfaces

Croll

Hosseini

Bartlett

2019

Adv Materials Technologies

132

107

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“…Unfortunately, the reverse reaction was not investigated. Kaiser et al derivatized a hydrogenated carboxylated nitrile butadiene rubber with anthracene groups that allowed photodimerization and thus network formation . Dimers were cleaved either through UV exposure (λ = 254 nm, 1.2 mW cm −2 ) or dissociation upon heating to 70 °C.…”

Section: On‐demand Debonding Based On Reversible Bondsmentioning

confidence: 99%

(De)bonding on Demand with Optically Switchable Adhesives

Hohl

Weder

2019

Advanced Optical Materials

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nature of polymer-based adhesives prevent their easy removal and stifle or complicate debonding, rebonding, (end-of-life) recycling, and repair. In this context, the development of debonding-on-demand (DoD) adhesive technologies is attracting rapidly growing interest. Indeed, DoD techniques have already entered commercial exploitation in applications such as easily removable wound dressings, [2,3] temporal fixation in semiconductor manufacturing, [4][5][6] and the repair, replacement, or recycling of components. [7][8][9] While many debonding technologies employ heat to reduce the adhesive strength by imparting physical property changes of the adhesive, [10][11][12][13][14] light-induced debonding technologies represent an emerging field and have been much less explored. Photoirradiation is an attractive alternative to thermal debonding as it allows an efficient, contactless, remote stimulation that can be temporally and spatially controlled. [15][16][17][18] Moreover, factors such as the irradiation wavelength, intensity, and time can easily be tuned and it is often possible to focus the energy entry to the adhesive and minimize or avoid exposure of (sensitive) substrates. Of course, the approach requires that at least one of the substrates to be bonded is sufficiently transparent.The design of a light-debondable adhesive system is strongly related to the adhesive type and the requirements imparted by the application(s) for which the adhesive is designed. For instance, pressure-sensitive adhesives (PSAs), such as used in adhesive tapes, need to efficiently adhere under ambient conditions with only a brief application of pressure, they should withstand the (comparably small) loads experienced while bonded, and they must also be easily removable, ideally without leaving any residues on the substrate. [19,20] PSAs are therefore normally based on lightly physically or chemically cross-linked rubbery polymers such as natural rubber, styrene butadiene block copolymers, and acrylics. These materials provide a balance between adhesive and cohesive performance, i.e., adequate stiffness and strength to resist deformation and cohesive failure, and appropriate elasticity in order to establish adequate contact with the substrate. [1] On the other hand, structural adhesives must be able to effectively transmit large loads across the bonded joint and the high strength and high rigidity required for this function are usually achieved by the formation of glassy networks. Examples of such materials include cross-linked epoxy resins, which may possess shear strengths of >35 MPa, cyanoacrylates (superglues), acrylics, and polyurethanes. [19] Adhesives that enable bonding and especially debonding on demand (DoD) have attracted rapidly growing interest in the last decade, as these capabilities greatly improve the functionality of adhesives, particularly in connection with temporal fixation, repair, and recycling. Indeed, DoD techniques have already entered commercial exploitation in applications such as easily removable wound dressin...

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“…unmanned systems), [40][41][42][43] while other defense applications need only a single, rapid transformation to occur. 44 Perhaps equally important is the time scale of the response. As illustrated in Fig.…”

Section: Potential Mechanisms For Making Mechanically Responsive Glassesmentioning

confidence: 99%

Stimuli‐responsive mechanical properties in polymer glasses: challenges and opportunities for defense applications

Dennis

Savage

Mrozek

et al. 2020

Polymer International

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The potential utility that responsive glasses provide in the areas of aeronautics, protection and unmanned systems is reviewed in this article. The article focuses on two broad classes of stimuli, photo and thermal, to better illustrate the challenges and convey some of the potential in developing these materials for the often extreme operational environments of defense applications. Three response mechanisms are outlined to provide a range of mechanical behaviors on demand: (i) shape-changing functionalities which locally yield or soften the material to stimulate chain mobility; (ii) bond forming (or breaking) chemistries which increase (or decrease) the stiffness of the material; and (iii) energy absorbing groups which convert the incoming stimuli into a spatially controlled heating and result in a designed softening of the material. Overall, continuing to develop responsive polymer glasses that respond rapidly and efficiently under low energy inputs will be critical for future defense applications.

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Switching “on” and “off” the adhesion in stimuli-responsive elastomers

Cited by 40 publications

References 42 publications

Switchable Adhesives for Multifunctional Interfaces

Switchable Adhesives for Multifunctional Interfaces

(De)bonding on Demand with Optically Switchable Adhesives

Stimuli‐responsive mechanical properties in polymer glasses: challenges and opportunities for defense applications

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