Adhesion modified peel test

Adhesion of Plasma-Sprayed Hydroxyapatite Coatings 7.5.2.1 Modified Peel Test According to ASTM D3167-10... 

Tanknoto, Y Saeki, H. Kimoto, S. Nishiwaki, T. Nishiyama,N. Evaluation of adhesive properties of three resilient denture liners by the modified peel test method. Acta. Biomater., 2009, 5(2), 764-769. 

Adhesives - determination of firee monomer content in adhesives based on synthetic polymers Stmctural adhesives - T-peel test for fiexible-to-flexible bonded assemblies (ISO 11339 1993 modified)... 

The test methods presently used to evaluate the adhesion of pressure-sensitive adhesives to release liners are modified adhesion tests, such as the 180° or 90° peel test, with the liner adhered to a test panel, or a T-peel test, where the sample is freely suspended while the tape is peeled at a controlled rate from the release liner. The values obtained by the latter method are alfected considerably by the stiffness of the liner, which alters the angle of peel. 

Additional data should be obtained with a cationic, and anionic styryl-functional silanes on a filler in a rubber that shows true adhesion (cohesive failure) in peel tests on glass to determine the ultimate effect of adhesion on reinforcement. Data of Tables 1 and 2 suggest that the iso-thiuronium chloride, and the vinylbenzyl functional silanes should be considered generally along with amine and mercaptan-functional silanes in modifying mineral fillers for rubbers. 

Most adhesive tapes are composed of a flexible backing (paper, plastic, cloth, metal foil, etc.) to which a pressure-sensitive adhesive has been applied to one side (both sides for double-sided tapes). Pressure-sensitive adhesives typically consist of a rubbery material with a modifying tactifier that may be applied to the tape by a solvent system, hot melt, or by other means. One would expect such materials to be sensitive to the mode of stress (tensile versus shear) in the region where debonding occurs. Furthermore, since tacky rubbers of the type used in pressure-sensitive adhesive are viscoelastic, one would anticipate material properties to be time- and rate-dependent. Are these expectations consistent with the observations from your simple peel test ... 

Table 14.3 contains data that compares the results of plasma treatment and sodium etching for four fluo-ropolymers. Peel strengths of untreated and treated samples were measured by bonding them into T-peel specimen using the flexibilized epoxy adhesive Scotch-Weld 3553 (available from 3M Corp.). The laminates were cured for several hours at 70°C and peel tested at 12.5 cm/min pull rate. Polytetrafluoroethylene does not accept plasma treatment as well as PEA and FEP, as indicated by its relatively low peel strength. Sodium etching is the only effective method of modifying the surface of PTFE. 

The lap-shear and 180° peel test performance of very soft acrylic adhesives modified with nanoclay or silica nanoparticles were improved by the addition of nanoparticles (Patel et al. 2006). The addition of 6 wt% of nanoclay or 50 wt% of silica increased the peel force by about 40%. 

Note that studies made with the original unmodified polyphenylene oxide etched in the above solution for 3 min at 65 °C have revealed that chromic acid solution becomes ineffective after its first use. The evaluation was made with AF-30 nitrile-phenolic adhesive and modified T-peel tests. If it is desired to avoid this possible problem, vacuum blasting, followed by an acetone wipe, can be used. ... 

As stated earlier, adhesion is a major concern in electronic applications involving thin polyimide films either coated on hard substrates or laminated with metal ribbons. In these cases, neither lap-shear nor die-shear techniques allow the determination of the adhesion strength this can be done by using either the 90° peel test or the island blister test whose principles are sketched in Figs 12.26 and 12.27. The 90° peel test provides reliable data for the measurement of practical adhesion, especially useful for comparing the effect of surface treatments on the interfacial adhesion. The standard peel test procedure has been modified to determine the adhesive strength of thin polyimide films coated onto 10-cm silicon wafers. The equipment illustrated in Fig. 12.26 maintains a 90° peel effort during the test conducted at room temperature with a constant rate of crosshead displacement of 2 mm min . ... 

An example of this improvement in toughness can be demonstrated by the addition of Vamac B-124, an ethylene/methyl acrylate copolymer from DuPont, to ethyl cyanoacrylate [24-26]. Three model instant adhesive formulations, a control without any polymeric additive (A), a formulation with poly(methyl methacrylate) (PMMA) (B), and a formulation with Vamac B-124 (C), are shown in Table 4. The formulation with PMMA, a thermoplastic which is added to modify viscosity, was included to determine if the addition of any polymer, not only rubbers, could improve the toughness properties of an alkyl cyanoacrylate instant adhesive. To demonstrate an improvement in toughness, the three formulations were tested for impact strength, 180° peel strength, and lapshear adhesive strength on steel specimens, before and after thermal exposure at 121°C. 

Membranes were sputtered with platinum and examined using FESEM-Hitachi 4800 scanning electron microscopy (SEM). A CSI-135 permeability gas cell was used to measure the gas transmission rate (GTR) of air through the umnodified and modified membranes. To measure the adhesion between the layers of the membrane assembly, a 180 peel-off test was carried out using Instron-5582. 

Clarke (7), as early as 1971, studied the behavior of a nitrile rubber modified, epoxy paste adhesive using the climbing drum peel strength test. Peeling resistance was... 

While the numerical values of a tensile adhesion test according to ASTM C633-01 (2001) and a peel adhesion test according to a modified ASTM D3167-03a (2004) designation (Sexsmith and Troczynski,... 

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