Switching the Adhesive State of Catecholic Hydrogels using Phototitration

White, Evan M.; Seppala, Jonathan E.; Rushworth, Parker M.; Ritchie, Branson W.; Sharma, Suraj; Locklin, Jason

doi:10.1021/ma401594z

Cited by 55 publications

(53 citation statements)

References 41 publications

(64 reference statements)

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“…It has been pointed out that mono-complex could be formed between catechol and Fe 3+ ions at low pH value. [35][36][37] However, the monocomplexation could not lead to effective crosslinking. On the other hand, Fe 3+ ions could also promote catechol-catechol covalent linkages formation, which is a fast reaction at pH ≤ 3.…”

Section: Adhesive Properties Of the Synthetic Adhesive Polymermentioning

confidence: 99%

Humid Bonding with a Water‐Soluble Adhesive Inspired by Mussels and Sandcastle Worms

Jia

et al. 2014

Macro Chemistry & Physics

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Inspired by mussels and sandcastle worms, a water-soluble adhesive is prepared by grafting catechol and phosphoric acid functionalities to the polyoxetane backbone, which achieves improved adhesion in humid environment. The adhesive is characterized by 1 H and 31 P NMR spectroscopy and size-exclusive chromatography. The infl uence of the content ratio of catechol and different phosphoric acid groups and the Fe 3+ ions as the crosslinker on the outcome of the adhesive properties is investigated. When the molar ratio of Fe 3+ to catechol and PO 4 is 1/1 and 0.7/1, respectively, the best bonding strength of 0.35 MPa is achieved for the adhesive containing 5 mol% catechol and 26 mol% bis-phosphoric acid groups under humid conditions. It is found out that Fe 3+ interacts not only with the catechol, but also with the bis-phosphoric acid groups, which accounts for its performance in humid conditions.

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Section: Adhesive Properties Of the Synthetic Adhesive Polymermentioning

confidence: 99%

Humid Bonding with a Water‐Soluble Adhesive Inspired by Mussels and Sandcastle Worms

Jia

et al. 2014

Macro Chemistry & Physics

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“…The photocleavable o ‐nitrophenyl ethyl moieties were then employed for optical debonding. In another study, Locklin and co‐workers showed that in the presence of photoacid generators, light can be used to manipulate the pH, and therefore the adhesion properties of a pH‐dependent network . The system investigated comprised a hydrogel based on a polyacrylamide copolymer carrying catechol groups that undergoes a gel–sol transition upon UV irradiation (λ = 254 nm).…”

Section: Irreversible Switching Of the Adhesive Propertiesmentioning

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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“…The adhesion strengths of PA-0.3, PA-0.4, and PA-0.5 are quite similar, thus demonstrating that a maximum plateau may be reached in PA-0.3. This DOPA derivative has been incorporated into many synthetic adhesives [8e11, 14,15], and the amount of catechol contents in the polymer can influence the adhesion performance dramatically. Theoretically, more catechol groups can provide more interaction with the substrate, thus enhance the adhesion force.…”

Section: Application To Dismantlable Adhesivesmentioning

confidence: 99%

A facile approach to catechol containing UV dismantlable adhesives

Wang

et al. 2015

Polymer

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Switching the Adhesive State of Catecholic Hydrogels using Phototitration

Cited by 55 publications

References 41 publications

Humid Bonding with a Water‐Soluble Adhesive Inspired by Mussels and Sandcastle Worms

Humid Bonding with a Water‐Soluble Adhesive Inspired by Mussels and Sandcastle Worms

(De)bonding on Demand with Optically Switchable Adhesives

A facile approach to catechol containing UV dismantlable adhesives

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