Peel adhesion

In rubber base adhesives, fillers may affect properties such as cohesion, cold flow, rheology and peel adhesion. Most fillers increase cohesion and reduce cold flow. In some formulations, even a small addition of filler dramatically reduces peel strength either because of interactions with the tackifier or because filler particles at the surface reduce the area of contact between the adhesive and the substrate. 

Solvent-borne polychloroprene adhesives are unsuitable for bonding low-energy substrates, such as PVC. However, water-borne polychloroprene adhesives display good peel adhesion to vinyl substrates. Addition of an accelerator such as zinc oxide is essential for improved hot bond strength. 

Jha A., Bhowmick A.K., Eujitsuka R., and Inoue T. Interfacial interaction and peel adhesion between polyamide and acrylate rubber in thermoplastic elastomeric blends, J. Adhes. Sci. Technol., 13(6), 649, 1999. 

FIGURE 23.17 Styrene-butadiene copolymer (SBR) peel adhesion test piece after first appl3nng a gas decompression (GD) procedure and then peel testing. 

BS 903 Part A4858 is identical to ISO 4647 and Part A 5659 identical to ISO 5603. It is significant that the equivalent ASTM standards are not produced under the auspices of the committee for rubber but in a subcommittee of the textiles committee specifically covering tyre cord and fabrics. The H-test is in D477660 and the method for steel cord in D222961. There is also a method for strap peel adhesion test of reinforcing cords or fabric in D439362. 

ASTM D4393, 2004. Standard test method for strap peel adhesion of reinforcing cords or fabrics to rubber compounds. 

Effect of the coupling agent mercaptoester concentration on the peel adhesion and corrosion protection of epoxy/EME/steel test panels [7]... 

Acrylic latex sealants. Basic acrylic latex sealant formulations were compounded in a sigma blade mixer, as shown in Table 3. The water-borne silanes were then incorporated into a base. Standard wet and dry peel adhesion determinations from various substrates were performed periodically in accordance with ASTM C794-8. 

Corrosion performance was evaluated by the scab corrosion test. The coated panels were scribed and subjected to 25 cycles as follows 15 min immersion in 5% NaCl solution, 75 min air-dry at room temperature, followed by 22.5 h exposure to 85% relative humidity (RH) and 60°C environment. The tested samples were examined visually for failure such as corrosion, him lifting, peeling, adhesion loss, or blistering. The distance between the scribe line and the unaffected coating was measured as the corrosion creepage. 

Fig. 13. Results of 180° peel adhesion tests for epoxy cured with polyamic acid systems (cir-cles=cure for 1 h at 125 °C, 2 h at 250 °C, squares=cme for 1 h at 250 °C, triangles=low molecular weight PA A, cure for 1 h at 125 °C, 2 h at 250 °C)...

It was observed that the polymer layers used for the SANS experiment could not be separated after contact had been maintained for several hours, the interface between the two sheets having been eliminated by the inter-diffusion. Such an increase in peel adhesion with contact time have in fact been directly measured for these blends [1,5]. Notwithstanding the broad glass transitions, the inter-diffusion revealed by both the SANS and adhesion experiments provides direct evidence of the thermodynamic miscibility of the blend. 

Figure 8.53. Effect of fumed silica surface area on peel adhesion of silicone sealant. [Data from Cochrane H, Lin C-S, Rubber World, 1985.]...

Figure 7.28 Peel adhesion test loading jig with attached deadweight (Heimann, 1999).

Figure 7.32 Peel adhesion strength of plasma-sprayed hydroxyapatite coating on a Ti6AI4V foil without (circles) and with a titania bond coat (crosses). The size of the symbols reflect the statistical error of the measurements. Extension of the regression...

Sexsmith, M. and Troczynski, T. (1994) Peel adhesion test for thermal spray coatings. /. Therm. Spray Technol, 3 (4), 404—414. 

T-Peel (adhesion bond) Spark Qualitative seribe Corrosion of the substrate Visual, color, cracking, blistering, etc. Mechanical properties retention... 

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