Strain energy release rates of a pressure sensitive adhesive measured by the shaft-loaded blister test

O'Brien, Emmett P.; Ward, T. C.; Guo, Siming; Dillard, David A.

doi:10.1080/00218460309560

Cited by 26 publications

(15 citation statements)

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“…Previous work suggested that the load-based equation is the preferred expression to calculate G due to the reduced effects of plastic deformation at the contact area and the insensitivity to changes in mechanical properties of the film [16,24] due to plasticization by fluid absorption. [23] However, in the presence of the slip-stick failure as observed for these samples, the displacement-based is the most appropriate expression to calculate G. Specimens were tested using loading and unloading cycles, which were repeated multiple times, to determine the crack length as a function of load and displacement (blister height).…”

Section: Methodsmentioning

confidence: 99%

“…NR has been used to quantify the moisture content at the polymer/substrate interface for a series of substrate surfaces. The shaft-loaded blister test (SLBT) has been utilized to measure adhesion [16][17][18][19][20][21][22][23][24] and mechanical properties of the adhered thin films. [16,20,[25][26][27][28][29][30] Using neutron reflectivity and SLBT adhesion measurements, we investigate how surface chemistry influences the water content near the interface and the adhesive fracture energy after attaining an apparent equilibrium in either the dry (0 % relative humidity (rh.)…”

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confidence: 99%

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Correlating Interfacial Moisture Content and Adhesive Fracture Energy of Polymer Coatings on Different Surfaces

2006

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Sn-Ag-Cu alloy. The Sn-Ag-Cu-Ge alloy solder ball had higher ball shear strength than the Sn-Ag-Cu alloy after an aging test at 150°C. The Sn-Ag-Cu-Ge alloy solder has better characteristics for both thermal oxidation and thermal reliability test. Therefore, it can be concluded that the Sn-Ag-Cu-Ge alloy is a good candidate to solve the oxidation problem, which is the most critical problem of the Pb-free solder. ExperimentalTwo solder ball compositions (in wt%) chosen in this study were : Sn3.0Ag0.5Cu and Sn3.0Ag0.5Cu0.05Ge, and had a diameter of 0.450 mm. The substrate used was CSP with 144 pad openings and each pad was 0.38 mm in diameter. The pads had an electroplated Ni/Au surface finish over Cu trace, with about 0.5 and 5.0 lm in thickness respectively. The solder balls from each composition were bonded to the CSP substrate using a water soluble flux under a reflow oven. The reflow condition is that preheating was done for 2 min at 150°C, the peak temperature was 235°C, and the dwell time was 60 sec.The solder balls after one were then analyzed or subjected to either multiple reflow up to 5 times or aging at 150°C for a duration up to 500 hs. XPS was utilized to check the oxide layer thickness and examine the surface chemical composition. We assumed that the oxide thickness can be defined by oxygen concentration under three atomic percent. The mechanical joint strength of the bonded balls was evaluated with Dage shear tester using a shear speed of 200 lm/s at a shear height of 10 lm.It is well known that ambient moisture and other environmental influences are detrimental to the adhesion of polymeric materials to metal surfaces. The primary reason why adhesion loss occurs is believed to be due to moisture accumulation at the polymer/metal interface. This is why adhesion loss does not generally correlate with the bulk moisture content of the polymer. In this work, we present measurements of the interfacial moisture content and adhesion for a series of polymer coatings having different surface chemistries. Measurements were made after reaching an apparent equilibrium in either a dry (0 % relative humidity) or wet (100 % relative humidity) environment. The loss of adhesion is found to correlate directly with interfacial water content. Surface treatments that resulted in a more hydrophilic surface lead to an increase in the interfacial water content and a decrease in interfacial fracture energy.Ambient moisture is well known to adversely affect the durability and performance of adhesive joints and coatings. [1] The interplay between the mechanical stress and chemical changes in the adhesive joint due to moisture adsorption is generally believed to be the root cause of failure of the adhesive application. Failure typically occurs at the polymer/metal interface, indicating that the primary mechanism for failure is not degradation of the bulk polymer. Instead, the structure of the coating near the interface is the determining factor in COMMUNICATIONS 114

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Section: Methodsmentioning

confidence: 99%

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confidence: 99%

Correlating Interfacial Moisture Content and Adhesive Fracture Energy of Polymer Coatings on Different Surfaces

2006

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“…Currently various measuring techniques aimed at testing adhesion of polymer-metal interfaces are available [3,4]. However, not many experimental studies are reported in literature in which the effect of deformation on the adhesion of the interface is considered.…”

Section: E-mail Address: Afedorov@rugnl (Av Fedorov)mentioning

confidence: 99%

Degradation and recovery of adhesion properties of deformed metal–polymer interfaces studied by laser induced delamination

Федоров¹,

Tijum²,

Vellinga³

et al. 2007

Progress in Organic Coatings

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Degradation and recovery of adhesion properties of deformed metal-polymer interfaces studied by laser induced delamination Fedorov, A. V.; van Tijum, R.; Vellinga, W. -P.; De Hosson, J. Th. M. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. AbstractAdhesion properties of polymer coatings on metals are of great interest in various industrial applications, including packaging of food and drinks. Particular interest is focused on polymer-metal interfaces that are subjected to significant deformations during manufacturing process. In this work steel samples laminated with polyethylene terephthalate (PET) were subjected to uniaxial tensile deformations followed by annealing treatments. The measurements have demonstrated degradation of adhesion of the metal-polymer interface as the strain introduced by the deformation increased. Moreover, it was observed that within the geometry used in the experiments tensile deformations of the metal substrate introduced in-plane compressive stresses in the bulk of the coating. After applying a thermal treatment restoration of the adhesion has been achieved.Laser induced delamination technique was used to monitor the adhesion properties. In this technique a coating is subjected to a series of infrared laser pulses with a stepwise increase of intensity. Upon increasing the laser pulse intensity, the pressure which is formed inside the blisters reaches a critical value, resulting in further delamination of the coating. To process the experimental data an elastic model was developed. From the analysis of the experimental data the critical stresses required for the delamination and the practical work of adhesion are derived. The model accounts for the compressive in-plane stress present in the coating of the deformed samples.

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“…The expressions used to calculate G T values are usually derived using linear elastic fracture mechanics (LEFM), where it is assumed that the adherend and adhesive are loaded within the elastic range, except locally at the crack tip where plastic deformation occurs [9,10]. In practice, some adhesive systems behave elastically, whereas others behave in-elastically or elastic-plastically, thus leading to yielding.…”

Section: Introductionmentioning

confidence: 99%

Effects of initial blister radius and shaft diameter on energy release rate of metal–polymer composite coating

Islam

Tong

2015

International Journal of Adhesion and Adhesives

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Strain energy release rates of a pressure sensitive adhesive measured by the shaft-loaded blister test

Cited by 26 publications

References 32 publications

Correlating Interfacial Moisture Content and Adhesive Fracture Energy of Polymer Coatings on Different Surfaces

Correlating Interfacial Moisture Content and Adhesive Fracture Energy of Polymer Coatings on Different Surfaces

Degradation and recovery of adhesion properties of deformed metal–polymer interfaces studied by laser induced delamination

Effects of initial blister radius and shaft diameter on energy release rate of metal–polymer composite coating

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