Supramolecular polymer adhesives: advanced materials inspired by nature

Heinzmann, Christian; Weder, Christoph; Espinosa, Lucas Montero de

doi:10.1039/c5cs00477b

Cited by 379 publications

(359 citation statements)

References 70 publications

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“…[75] In the highly bonded state G c is high, and in the minimally (ideally zero) bonded state G c becomes quite small. Typically, the goal is to create or destroy chemical bonds with an external trigger, many of which are available to the modern chemist (see below).…”

Section: Near-interface (G C )mentioning

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: Near-interface (G C )mentioning

confidence: 99%

Switchable Adhesives for Multifunctional Interfaces

Croll

Hosseini

Bartlett

2019

Adv Materials Technologies

132

107

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“…Hybridization is, likewise, generalizable to the high-specificity, high-affinity detection of any nucleic acid sequence. These observations have motivated decades of research aimed at harnessing the power of biological recognition in such technologies as sensors (reviewed in ref 1), “smart” responsive adhesives (reviewed in ref 2) and materials (reviewed in ref 3), synthetic biology (reviewed in ref 4), and molecular computing (reviewed in ref 5). …”

Section: Introductionmentioning

confidence: 99%

Using Nature’s “Tricks” To Rationally Tune the Binding Properties of Biomolecular Receptors

Ricci

Vallée‐Bélisle

Simon³

et al. 2016

Acc. Chem. Res.

140

131

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CONSPECTUS The biosensor community has long focused on achieving the lowest possible detection limits, with specificity (the ability to differentiate between closely similar target molecules) and sensitivity (the ability to differentiate between closely similar target concentrations) largely being relegated to secondary considerations and solved by the inclusion of cumbersome washing and dilution steps or via careful control experimental conditions. Nature, in contrast, cannot afford the luxury of washing and dilution steps, nor can she arbitrarily change the conditions (temperature, pH, ionic strength) under which binding occurs in the homeostatically maintained environment within the cell. This forces evolution to focus at least as much effort on achieving optimal sensitivity and specificity as on achieving low detection limits, leading to the “invention” of a number of mechanisms, such as allostery and cooperativity, by which the useful dynamic range of receptors can be tuned, extended, narrowed, or otherwise optimized by design, rather than by sample manipulation. As the use of biomolecular receptors in artificial technologies matures (i.e., moves away from multistep, laboratory-bound processes and toward, for example, systems supporting continuous in vivo measurement) and these technologies begin to mimic the reagentless single-step convenience of naturally occurring chemoperception systems, the ability to artificially design receptors of enhanced sensitivity and specificity will likely also grow in importance. Thus motivated, we have begun to explore the adaptation of nature’s solutions to these problems to the biomolecular receptors often employed in artificial biotechnologies. Using the population-shift mechanism, for example, we have generated nested sets of receptors and allosteric inhibitors that greatly expanded the normally limited (less than 100-fold) useful dynamic range of unmodified molecular and aptamer beacons, enabling the single-step (e.g., dilution-free) measurement of target concentrations across up to 6 orders of magnitude. Using this same approach to rationally introduce sequestration or cooperativity into these receptors, we have likewise narrowed their dynamic range to as little as 1.5-fold, vastly improving the sensitivity with which they respond to small changes in the concentration of their target ligands. Given the ease with which we have been able to introduce these mechanisms into a wide range of DNA-based receptors and the rapidity with which the field of biomolecular design is maturing, we are optimistic that the use of these and similar naturally occurring regulatory mechanisms will provide viable solutions to a range of increasingly important analytical problems.

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“…Polymers which can be degraded on command, i.e., upon exposure to a pre-defined external stimulus, are of great interest in the context of recycling, 1 debonding-on-demand adhesives, 2 small molecules release, 3 biomedical applications, 1 sensors, 4 and many other applications. 5,6 To achieve degradability, a variety of concepts have been investigated, including the introduction of chemically labile groups (such as esters or acetals), 7 the design of self-immolative polymers (which undergo depolymerization upon cleavage of stimuli-responsive end-groups), 8 the stimulidriven disassembly of supramolecular polymers, 2 the (dis)assembly of nanoparticles based on polymers exhibiting a lower critical solution temperature (LCST), 9 and the introduction of stimuli-responsive moieties that can be preferentially cleaved upon exposure to a specific stimulus or a combination thereof.…”

Section: Introductionmentioning

confidence: 99%

Azo-Containing Polymers with Degradation On-Demand Feature

2016

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ABSTRACT. Molecules comprising aliphatic azo moieties are widely used as radical polymerization initiators, but only few studies have explored their usefulness as stimuliresponsive motifs in macromolecular constructs. The controlled degradation of azo-containing polymers has indeed remained largely unexplored. Here we present the syntheses of linear azocontaining polyamides and polyurethanes and report on their thermally and optically induced responses in solution and the solid state. We show that the stimuli-induced degradation behavior depends strongly on the nature of the polymer backbone, the state of matter, and in solution, on the nature of the solvent. The stimuli-responsive solid-state properties of the azo-containing materials may be particularly useful. In the case of the polyurethanes studied here, temperatureor light-induced cleavage of the azo motifs led to a controllable decrease of the molecular weight, which in turn caused a reduction of the elongation at break, modulus and strength. The controlled degradation of the polymer in well-defined areas can be readily achieved via photopatterning, and this approach was shown to be useful to produce solid structures with graded mechanical properties.2

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Supramolecular polymer adhesives: advanced materials inspired by nature

Cited by 379 publications

References 70 publications

Switchable Adhesives for Multifunctional Interfaces

Switchable Adhesives for Multifunctional Interfaces

Using Nature’s “Tricks” To Rationally Tune the Binding Properties of Biomolecular Receptors

Azo-Containing Polymers with Degradation On-Demand Feature

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