Micromechanisms of Tack of Soft Adhesives Based on Styrenic Block Copolymers

Brown, Kelly; Hooker, Jacob C.; Creton, Costantino

doi:10.1002/1439-2054(20020301)287:3<163::aid-mame163>3.0.co;2-p

Cited by 108 publications

(100 citation statements)

References 23 publications

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“…An identical debonding mechanism was observed for all tack experiments with our model adhesives. Therefore, the measured values of force and displacement can be quantitatively compared between different films produced from different latexes [15,35,49]. The average values of the main quantitative parameters that can be extracted from the probe tack tests are illustrated in Figs.…”

Section: Resultsmentioning

confidence: 99%

“…9 and 10, respectively) showed very marked variation among the model PSAs assessed. In the debonding regime where failure occurs by progressive propagation of interfacial cracks as is the case here, the value of ε max is directly related to adhesion energy [35,52] and this is obvious by comparing Figs. 9 and 10.…”

Section: Resultsmentioning

confidence: 99%

“…Three quantitative parameters can be extracted from the curve: the peak stress σ max which is associated with the formation of cavities in the adhesive layer [15,35]; the maximum extension ε max ; and the total work performed to detach the adhesive layer from the surface, which can be obtained from the integral under the stress-strain curve and is defined as W adh .…”

Section: Probe Tack Experimentsmentioning

confidence: 99%

See 2 more Smart Citations

Assessing the effect of latex particle size and distribution on the rheological and adhesive properties of model waterborne acrylic pressure-sensitive adhesives films

Amaral

Roos²,

Asúa

et al. 2005

Journal of Colloid and Interface Science

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Probe Tack Experimentsmentioning

confidence: 99%

See 1 more Smart Citation

Assessing the effect of latex particle size and distribution on the rheological and adhesive properties of model waterborne acrylic pressure-sensitive adhesives films

Amaral

Roos²,

Asúa

et al. 2005

Journal of Colloid and Interface Science

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“…15,20,24,25 Hence, the large and dominant contribution of deformation of an adhesive material during the debonding process renders impossible prediction of adhesive strength based only on data regarding interfacial interactions. 26 The contribution of interfacial interactions to the total work of debonding of PSAs by a peel test is often around 1% but can be as low as 0.05% for a PSA with specific supramolecular structure, 24,27,28 while the major part of the total work of adhesive joint failure is due to the work of viscoelastic deformation of the adhesive material during failure of the bond. 15 In other words, the strength of an adhesive joint evaluated by the probe tack and peel tests characterizes the viscoelastic properties of the adhesive material, rather than the tack.…”

Section: Introduction: Theories Of Adhesionmentioning

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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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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“…[5][6][7][8][9] Following these advances, Lindner and Maevis 10 have studied the failure over time of acrylic PSA layers loaded to the subcritical stress level that does not cause immediate failure. Interestingly, they found that the failure under low load did not occur by a progressive creep of the adhesive but by the nucleation of cavities and their progressive growth.…”

Section: Introductionmentioning

confidence: 99%

Investigation of shear failure mechanisms of pressure‐sensitive adhesives

Sosson

Chateauminois

Creton

2005

J Polym Sci B Polym Phys

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We report new experiments investigating the failure mechanisms in shear, of thin layers of acrylic pressure-sensitive adhesives (PSA). We have developed a novel experimental device able to shear a soft adhesive layer confined between a rigid hemispherical lens and a rigid glass substrate. Using the resources of in situ contact visualization, the nonhomogeneous deformation of the layer and the shear failure processes were observed optically. Depending on the rheological properties of the adhesive, ratios of the contact radius over the layer thickness of 10-30 were achieved, mimicking well the contact conditions encountered in a thin adhesive layer within a joint. When the adhesive was weakly crosslinked, we observed a fluid-like behavior and could measure a reasonable value for the viscosity of the PSA, implying that flow can occur in the layer and failure will occur by creep. On the other hand, for a more crosslinked adhesive, closer to what is used in applications, a stick-slip peeling behavior was observed, which involves a coupling between peeling mechanisms at the leading edge of the contact and interfacial slippage. Such a process suggests a failure by fracture rather than by creep. Interestingly, the peeling mechanisms and the associated stress levels change significantly when the layer becomes as thin as 20 lm, implying a fracture process that is controlled by a critical energy release rate in shear G IIc rather than by a critical shear stress causing failure of the interfacial bonds.

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Micromechanisms of Tack of Soft Adhesives Based on Styrenic Block Copolymers

Cited by 108 publications

References 23 publications

Assessing the effect of latex particle size and distribution on the rheological and adhesive properties of model waterborne acrylic pressure-sensitive adhesives films

Assessing the effect of latex particle size and distribution on the rheological and adhesive properties of model waterborne acrylic pressure-sensitive adhesives films

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

Investigation of shear failure mechanisms of pressure‐sensitive adhesives

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