Fine Tuning the Adhesive Properties of a Soft Nanostructured Adhesive with Rheological Measurements

Deplace, Fanny; Carelli, C.; Mariot, Sandrine; Retsos, Haris; Chateauminois, A.; Ouzineb, Keltoum; Creton, Costantino

doi:10.1080/00218460902727381

Cited by 142 publications

(247 citation statements)

References 2 publications

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“…At the other extreme, when f v prevails, the probe tack curve is as that shown by curve 2 in Figure 42. 16 This type of adhesive joint failure is characteristic of fluid PSAs, 141,142 which demonstrate comparatively low cohesion strength, indicated by a lower peak of debonding stress, r, coupled with a relatively high value of elongation, e. In this case, the adhesive joint breaks by cohesive fracture in the bulk of the adhesive layer, and the debonding process is governed by viscous flow. This type of debonding is also called ''cohesive debonding,'' where some residues of adhesive are left on the probe at the end of the test.…”

Section: Linear Elastic and Adhesive Properties: Validity Of Dahlquismentioning

confidence: 99%

“…16 The curve shows a peak of debonding stress followed by a more or less pronounced plateau, and then a gradual or sharp decrease of detaching force to zero. Detachment in that case occurs at the interface between the probe and the adhesive layer, 142 with no macroscopic residue left on the probe. When material strain hardening in fibrils is observed just before the final detachment, the probe tack stress-strain curve may demonstrate a slight increase in the stress or a second peak.…”

Section: Linear Elastic and Adhesive Properties: Validity Of Dahlquismentioning

confidence: 99%

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Molecular and nanoscale factors governing pressure‐sensitive adhesion strength of viscoelastic polymers

Feldstein

Siegel

2012

J Polym Sci B Polym Phys

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Pressure‐sensitive adhesives (PSAs) are finding increasing applications in various areas of industry and medicine. PSAs are a special class of viscoelastic polymers that form strong adhesive joints with substrates of varying chemical nature under application of light external bonding pressures (1–10 Pa) over short periods of time (1–5 s). To be a PSA, a polymer should possess both high fluidity under applied bonding pressure, to form good adhesive contact, and high cohesive strength and elasticity, which are necessary for resistance to debonding stresses and for dissipation of mechanical energy at the stage of adhesive bond failure under detaching force. For rational design of novel PSAs, molecular insight into mechanisms of their adhesive behavior is necessary. As shown in this review, strength of PSA adhesive joints is controlled by a combination of diffusion, viscoelastic, and relaxation mechanisms. At the molecular level, strong adhesion is the result of a narrow balance between two generally conflicting properties: high cohesive strength and large free volume. These conflicting properties are difficult to combine in a single polymer material. Individually, high cohesive interaction energy and large free volume are necessary but insufficient prerequisites for PSA strength. Evident correlations are observed between the adhesive bond strengths of different PSAs, and their relaxation behaviors are described by longer relaxation times. Innovative PSAs with tailored properties can be produced by physical mixing of nonadhesive long‐ and short‐chain linear parent polymers, with groups at the two ends of the short chains complementary to the functional groups in the recurring units of the long chains. Although chemical composition and molecular structure of such innovative adhesives are unrelated to those of conventional PSAs, their mechanical properties and adhesive behaviors obey the same general laws, such as the Dahlquist's criterion of tack. © 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2012

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Section: Linear Elastic and Adhesive Properties: Validity Of Dahlquismentioning

confidence: 99%

Section: Linear Elastic and Adhesive Properties: Validity Of Dahlquismentioning

confidence: 99%

Molecular and nanoscale factors governing pressure‐sensitive adhesion strength of viscoelastic polymers

Feldstein

Siegel

2012

J Polym Sci B Polym Phys

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“…However, the equations of Nase et al 28 and the criteria of Deplace et al 22 apply for the failure of an elastic material. As the nanocomposites are visco-plastic, as is apparent in their yielding (Figure 3a), we propose to substitute the yield stress,  y , for E' in the criteria for fibrillation.…”

Section: Ir Heating Of Nanocomposite Adhesives To Switch Off Adhesionmentioning

confidence: 99%

“…5 Figure S1 shows that with the addition of the nanoparticles in our system, E' increased, and the ratio of the loss tangent (tan) over E', which usually correlates with the tack adhesion energy, [22][23][24] fell only slightly, as some of the viscous dissipation was lost. Above the optimal nanoparticle concentration, the nanocomposite was far too solid-like for a tacky PSA; E' rose far above the acceptable limit of 0.3 MPa (referred to as the Dahlquist criterion).…”

mentioning

confidence: 91%

Large-Area Patterning of the Tackiness of a Nanocomposite Adhesive by Sintering of Nanoparticles under IR Radiation

Gurney

Dupin

Siband³

et al. 2013

ACS Appl. Mater. Interfaces

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We present a simple technique to switch off the tack adhesion in selected areas of a colloidal nanocomposite adhesive. It is made from a blend of soft colloidal polymer particles and hard copolymer nanoparticles. In regions that are exposed to IR radiation through a mask, the nanoparticles sinter together to form a percolating skeleton, which hardens and stiffens the adhesive. The tack adhesion is lost locally. Masks can be made from silicone-coated disks, such as coins. Adhesive island regions are defined with the surrounding regions being a non-tacky coating. When optimizing the nanocomposite's adhesive properties, the addition of the hard nanoparticles raises the elastic modulus of the adhesive significantly, but adhesion is not lost because the yield point remains relatively low. During probe-tack testing, the soft polymer

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“…As the probe is retracted, the adhesive film is drawn into fibrils. The adhesive must be sufficiently soft so the fibrils do not detach at small strain, yet still require some energy to deform [3]. PSAs are typically made from high molecular weight polymers that are lightly crosslinked to form viscoelastic solids.…”

Section: Introductionmentioning

confidence: 99%

Tack energy and switchable adhesion of liquid crystal elastomers

Corbett

Adams

2013

Soft Matter

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The mechanical properties of liquid crystal elastomers (LCEs) make them suitable candidates for pressure-sensitive adhesives (PSAs). Using the nematic dumbbell constitutive model, and the block model of PSAs, we study their tack energy and the debonding process as could be measured experimentally in the probe-tack test. To investigate their performance as switchable PSAs we compare the tack energy for the director aligned parallel, and perpendicular to the substrate normal, and for the isotropic state. We find that the tack energy is larger in the parallel alignment than the isotropic case by over a factor of two. The tack energy for the perpendicular alignment can be 50% less than the isotropic case. We propose a mechanism for reversibly switchable adhesion based on the reversibility of the isotropic to nematic transition. Finally we consider the influence of several material parameters that could be used to tune the stress-strain response.

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Fine Tuning the Adhesive Properties of a Soft Nanostructured Adhesive with Rheological Measurements

Cited by 142 publications

References 2 publications

Molecular and nanoscale factors governing pressure‐sensitive adhesion strength of viscoelastic polymers

Molecular and nanoscale factors governing pressure‐sensitive adhesion strength of viscoelastic polymers

Large-Area Patterning of the Tackiness of a Nanocomposite Adhesive by Sintering of Nanoparticles under IR Radiation

Tack energy and switchable adhesion of liquid crystal elastomers

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