Energy Dissipation During Rupture of Adhesive Bonds

Baljon, Arlette R. C.; Robbins, Mark O.

doi:10.1126/science.271.5248.482

Cited by 136 publications

(109 citation statements)

References 19 publications

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“…Within the time scales of our measurements, the adhesive strength increased roughly linearly both with the contact time t c , and unloading rate dL/dt. Qualitatively, the observed aging and rate-dependent effects are similar to those previously observed for nonequilibrium (hysteretic) adhesion processes of, for example, surfactant and polymer surfaces (7,8,10,12,22). However, the unloading curves for these systems were still JKR-like, i.e., curved, rather than the straight, almost horizontal path until the failure point.…”

Section: Resultssupporting

confidence: 83%

“…These theories have been found to hold well for molecularly smooth and nonhysteretic surfaces both at macroscopic and microscopic length scales. However, the adhesion mechanics of viscoelastic materials and sticky fluids are not so well understood (5)(6)(7)(8)(9). The adhesion or fracture energy of viscoelastic, such as some polymer, materials can be four orders of magnitude greater than the thermodynamic value, which has been attributed to such energy-dissipating processes as molecular interdiffusion or entanglements across the contact junction and macroscopic viscous/plastic deformations (10)(11)(12).…”

mentioning

confidence: 99%

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Adhesion and detachment mechanisms of sugar surfaces from the solid (glassy) to liquid (viscous) states

Zhao

Zeng

Tian

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

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The viscosity of some sugars varies continuously by Ϸ10 orders of magnitude over a temperature range of 50°C. Sugars are therefore ideal model materials for studying the failure mechanism of materials as they change from the solid to the liquid state. We have used a surface forces apparatus coupled to interference and optical microscopy imaging to study the way two sugar surfaces adhere and detach from adhesive contact. The sugar-coated layers on mica displayed significant loading-unloading hysteresis, and the adhesive strength and failure mechanism during a ''loading-unloading cycle'' depended on the loading rate, contact time, and unloading rate. The failure of two glassy sugar surfaces was manifested by the nucleation of many sharp microcracks at the external boundary that rapidly propagate along the original contact interface. At the other extreme, when the material is a liquid, ''failure'' occurs through the nucleation and inward growth of large rounded ripples, characteristic of a Saffman-Taylor fingering instability. In the transition from glassy to viscous failure, sharp crack tips and smooth rounded fingers coexist during the crack propagation. In addition, whereas the detachment geometry of two glassy surfaces was characterized by a peeling-like mechanism along a plane, the fingers associated with the ''snapping'' of a liquid neck extended in all directions. These findings provide insights into the adhesion and failure mechanisms of materials at the micro/nanoscales and are also relevant to the action of interparticle forces between sugar particles, such as those used in inhalation drug delivery.adhesive failure ͉ fingering instability ͉ crack propagation ͉ contact dynamics E veryday experiences tell that solids fracture and liquids flow.However, for many materials there is no clear boundary between the solid and liquid states (1). Also, a material can behave like either a solid or a liquid depending on the time scale of the observation. A typical material that does this is pitch, which, if hit rapidly with a hammer, shatters like a brittle solid, but can flow like a liquid over periods of years (2). Here, we report on a study of the adhesion and detachment mechanisms of a common sugar, glucose, as it transits from the solid (glassy) to the liquid (viscous) state.The classic Hertz and Johnson-Kendall-Roberts (JKR) theories (3, 4) describe the adhesion and contact mechanics of solids. These theories have been found to hold well for molecularly smooth and nonhysteretic surfaces both at macroscopic and microscopic length scales. However, the adhesion mechanics of viscoelastic materials and sticky fluids are not so well understood (5-9). The adhesion or fracture energy of viscoelastic, such as some polymer, materials can be four orders of magnitude greater than the thermodynamic value, which has been attributed to such energy-dissipating processes as molecular interdiffusion or entanglements across the contact junction and macroscopic viscous/plastic deformations (10-12). In addition, detaching viscoelasti...

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Section: Resultssupporting

confidence: 83%

mentioning

confidence: 99%

Adhesion and detachment mechanisms of sugar surfaces from the solid (glassy) to liquid (viscous) states

Zhao

Zeng

Tian

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

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“…I adhesives is possible [10]. Simple coarse-grained bead-spring models successfully treat bulk polymer melts and networks [11,12].…”

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confidence: 99%

Interfacial Fracture between Highly Cross-Linked Polymer Networks and a Solid Surface: Effect of Interfacial Bond Density

2001

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+-e~m -For highlycrosslinked,polymer networksbonded to a solid surface,the effect G9of interracialbond density as well as system size on interracialfracture is studied molecular dynamics simulations. The correspondence between the stress-straincurve and the sequence of molecular deformations is obtained. . "The failure strain for a fully bonded surface is equal to the strain necesmry to maketaut the averageminimalpath throughthe networkhorn the bottom solid surface to the top surface. At bond coveragesless than full, nanometer..scale cavities form at the surface yielding an inhomogeneousstrain profile.The failurestrainand stressare linearlyproportional to the numberof bonds at the interface unIessthe number of bonds is so few that van der Waals interactionsdominate. The failureis alwaysinterracialdue to fewerbonds at the interfacethan in the bulk.

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“…22"c M Progress in atomic aspects of fracture has recently occurred through simulations for bulk, crystals [1,2]. Less work exists foramorphous materials like polymers [3]. Since the typical adhesive material is a polymer network, the interracial fracture of polymer adhesives bonded to a solid surface is a fundamental and practical problem [4].…”

Section: E-04mentioning

confidence: 99%

Molecular-To-Continuum Fracture Analysis of Thermosetting Polymer/Solid Interfaces

Kent¹,

Reedy²,

Stevens³

2000

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Energy Dissipation During Rupture of Adhesive Bonds

Cited by 136 publications

References 19 publications

Adhesion and detachment mechanisms of sugar surfaces from the solid (glassy) to liquid (viscous) states

Adhesion and detachment mechanisms of sugar surfaces from the solid (glassy) to liquid (viscous) states

Interfacial Fracture between Highly Cross-Linked Polymer Networks and a Solid Surface: Effect of Interfacial Bond Density

Molecular-To-Continuum Fracture Analysis of Thermosetting Polymer/Solid Interfaces

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