Strain Field Self-Diagnostic Poly(dimethylsiloxane) Elastomers

Früh, Andreas E.; Artoni, Federico; Brighenti, Roberto; Dalcanale, Enrico

doi:10.1021/acs.chemmater.7b02438

Cited by 30 publications

(14 citation statements)

References 44 publications

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“…While hydrophobic host–guest interactions are rather weak compared to H‐bonding or metal–ligand complexation, they offer an interesting opportunity for underwater adhesion or surgical glues. A variety of host–guest systems based on crown ethers, cyclophanes, pillar[ n ]arenes, calix[ n ]arenes, and resorcin[ n ]arenes were reported, and in many cases control over polarity (and therefore solubility) and selectivity of the cavitands was achieved by functionalization of the macrocycles, giving rise to supramolecular polymers with applications in both solution and bulk . In the context of hydrogels the vast majority of studies involves supramolecular host–guest inclusion complexes based on cyclodextrins (CDs) or cucurbit[ n ]uril (CB[ n ], N = 5–8, 10) hosts.…”

Section: On‐demand Debonding Based On Reversible Bondsmentioning

confidence: 99%

(De)bonding on Demand with Optically Switchable Adhesives

Hohl

Weder

2019

Advanced Optical Materials

100

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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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Section: On‐demand Debonding Based On Reversible Bondsmentioning

confidence: 99%

(De)bonding on Demand with Optically Switchable Adhesives

Hohl

Weder

2019

Advanced Optical Materials

100

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“…Among the various existing compounds, spiropyran-based polymers are of particular interest since their photochromism capabilityi.e., the change in the emitted light wavelength (among the mechanochromic mechanophores it is worth mentioning also diarylbibenzofuranone [DABBF], tetraarylsuccinonitrile [TASN], diarylbibenzothiophenonyl [DABBT])-enables associating the color of the emitted light to the mechanical energy transferred to the material (Klajn, 2014;Li et al, 2017). Thanks to the quantitative measurement of the amount of mechanophore activation, stress, or strain self-sensing polymers can be obtained (Früh et al, 2017). Among the wide range of applications allowed by the mechanochemistry, mechanophores have been used also for inducing self-healing capabilities in polymers (Diesendruck and Moore, 2013).…”

Section: Conformational Changing Moleculesmentioning

confidence: 99%

Smart Polymers for Advanced Applications: A Mechanical Perspective Review

2020

Self Cite

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Responsive materials, as well as active structural systems, are today widely used to develop unprecedented smart devices, sensors, or actuators; their functionalities come from the ability to respond to environmental stimuli with a detectable reaction. Depending on the responsive material under study, the triggering stimuli can have a different nature, ranging from physical (temperature, light, electric or magnetic field, mechanical stress, etc.), chemical (pH, ligands, etc.), or biological (enzymes, etc.) type. Such a responsiveness can be obtained by properly designing the meso-or macroscopic arrangement of the constitutive elements, as occurs in metamaterials, or can be obtained by using responsive materials per se, whose responsiveness comes from the chemistry underlying their microstructure. In fact, when the responsiveness at the molecular level is properly organized, the nanoscale response can be collectively detected at the macroscale, leading to a responsive material. In the present article, we review the enormous world of responsive polymers, by outlining the main features, characteristics, and responsive mechanisms of smart polymers and by providing a mechanical modeling perspective, both at the molecular as well as at the continuum scale level. We aim at providing a comprehensive overview of the main features and modeling aspects of the most diffused smart polymers. The quantitative mechanical description of active materials plays a key role in their development and use, enabling the design of advanced devices as well as to engineer the materials' microstructure according to the desired functionality.

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“…Self-diagnostic poly(dimethylsiloxane) (PDMS) elastomers are produced by the addition of so-called mechanophore units, which generate a chemical response towards mechanical loads, as discussed by, e.g., Brighenti and Artoni [ 1 ]. The specific PDMS elastomer containing a supramolecular detection probe was presented and developed by Früh et al [ 2 ]. In this case, the elastomer reacts with strain-dependent levels of fluorescence when illuminated with UV light, thus enabling an in situ quantification of the material’s strain and, potentially, damage state.…”

Section: Introductionmentioning

confidence: 99%

Gradient-Enhanced Modelling of Damage for Rate-Dependent Material Behaviour—A Parameter Identification Framework

2020

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The simulation of complex engineering components and structures under loads requires the formulation and adequate calibration of appropriate material models. This work introduces an optimisation-based scheme for the calibration of viscoelastic material models that are coupled to gradient-enhanced damage in a finite strain setting. The parameter identification scheme is applied to a self-diagnostic poly(dimethylsiloxane) (PDMS) elastomer, where so-called mechanophore units are incorporated within the polymeric microstructure. The present contribution, however, focuses on the purely mechanical response of the material, combining experiments with homogeneous and inhomogeneous states of deformation. In effect, the results provided lay the groundwork for a future extension of the proposed parameter identification framework, where additional field-data provided by the self-diagnostic capabilities can be incorporated into the optimisation scheme.

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Strain Field Self-Diagnostic Poly(dimethylsiloxane) Elastomers

Cited by 30 publications

References 44 publications

(De)bonding on Demand with Optically Switchable Adhesives

(De)bonding on Demand with Optically Switchable Adhesives

Smart Polymers for Advanced Applications: A Mechanical Perspective Review

Gradient-Enhanced Modelling of Damage for Rate-Dependent Material Behaviour—A Parameter Identification Framework

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