Tape peeling

Cholewinski etal.[73] prepared a robust superhydrophobic bilayer coating containing PDMS-functionalized silica particles on top and an epoxy bonding layer at the base. It was fabricated with a facile dip-coating process that embedded micro-scale PDMS-functionalized silica particles with nano-scale roughness into an epoxy layer spin-coated onto a substrate. The APCAs of the coatings remained stable after four tape tests but no CAH values were reported. 

Barthwal et al. [74] developed superomniphobic surfaces on aluminum with a three-step method including etching with an acidic solution, anodization with sulfuric acid, and fluorination. The dtuability of the siufaces was tested by performing ten tape peeling attempts. The APCA of water remained above 150° while the oil APCA remained above 150° until the 8 cycle and slightly degraded in the last two cycles. Again no CAH values were reported. 

F)nset of contact between PDMS lens and sample 

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Adhesion for PADS-based siloxane polyimides was obtained over a range of comonomer compositions. The spun-on "PADS coatings generally had to be annealed at 300°C to impart adhesion to silicon. In at least one series of copolymer compositions, the PADS content could be decreased to 10 mole % while maintaining adhesion to silicon as determined by the Tape Peel Test. 

Print adhesion on plastics (and foil) is normally checked using a self-adhesive tape peel test. A few inches of a suitable standard tape is firmly pressed onto the print area then pulled off, slowly at first, then more rapidly. An assessment of print adhesion can be made from the quantity (ideally none) removed. Adhesion can vary according to the type and colour of the ink, the degree of pretreatment, the surface involved and the printing process, etc. In order to test print under likely use conditions, product immersion tests may be necessary 60°C (140°F) is a frequently used condition, for 3 to 6 h. If product-pack may be used with soapy hands, a solution of soap can be employed. A print adhesion test, as above, can then be carried out, on the washed material, after it has been cooled to room temperature. 

M Magic Tape, peeled from a number of substrates. Pretreatment of the surface consisted simply of washing in acetone. 

Low angle tape peel Spin coat PMMA (3000 RPM. 1 min). Bake sample at 150 °C for 2 min. Repeat once. 

So far, investigations of the mechanical properties of the multilayers assembled by ESA have been limited to tape peel tests [40,90,93,160,197,204,216]. Failure occurring in the layer, at the interface with the substrate, or in the tape have been reported, depending on the system under investigation. Again, cross-linking may be useful to improve the mechanical properties of the multilayers [197]. 

Adhesion Micro-Indentation, Scotch-tape peeling test... 

Figure 12. Master curve for the force of a tape peeled at 90 ° from a glass surface (transposed to 23 C according to WFL principle [210])... 

A 0.40-mm thick PP sheet needed improved aqueous-based ink adhesion. PP sheets were treated in a plasma system similar to the one shown in Fig. 20.7. Such a machine can treat polymer sheets from 27-60 in. The surface energy of the sheets was enhanced substantially after atmospheric plasma treatment. Untreated, corona-treated, and APGD-treated PP sheets were printed with a water-based ink deposited by a flexographic printer and then subjected to a tape-peel test to determine the adhesion of the ink. During the peel test, the untreated samples exhibited total ink-adhesion failure, with all image ink removed with the tape. The corona treated film retained approximately... 

The above equation indicates complete combustion of the fuel gas methane. The volume of air required for complete theoretical combustion of gas (such as methane) is called the stoichiometric volume (100%). A flame containing an excess (>100% stoichiometry) of air is referred to as an oxidizing flame a flame that does not have sufficient air (<100% stoichiometry) to complete combustion is a reducing flame. Figure 5.14 shows the effect of using more or less air than the stoichiometric volume on tape peel strength of polyethylene or PP. A maximum value develops at about 115% stoichiometry or 15% excess air. 

The Tape Peel test, described by ASTM standard D2141, measures the amount of force required to peel a pressure sensitive tape from a polyolefin surface. The ability to obtain an acceptable bond between the polymer surface and the coating or adhesive depends on the level of treatment, i.e., the dyne level. The force required to peel a pressure sensitive tape is directly related to the degree of adhesion. 

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