Mechanics of Soft PSAs (Pressure Sensitive Adhesives)

Abstract

Abstract:The adhesive performances of a PSA (Pressure Sensitive Adhesive) are attributed to their viscoelastic properties. In this paper we analyze the viscoelastic behavior of different PSAs having substantially similar adhesive performance. Linear and non linear analyses were performed using small amplitude oscillatory shear tests and tensile stress-strain tests, respectively. It is shown that linear viscoelastic tests are useful to qualitatively characterize the adhesive performances. However, deeper knowledge can be achieved by non linear viscoelastic tests. The true stress -true strain curves are modeled by using a theory accounting for the interpenetration of micro-network and the linear polymer. It is shown that the same substantial in-service properties can be achieved with adhesives showing different fingerprints in terms of viscoelastic spectra.

Reliability of sheet moulding composites (SMC) for the automotive industry

“…Concerning the fatigue behaviour, one of the most intricate tasks in designing with polymer composite is the definition of reliable allowable strength accounting for the large scatter in mechanical properties [12][13][14][15][16][17][18][19][20]. The complex scenario described so far requires a very expensive and lengthy test campaign [21][22][23][24][25][26][27][28][29][30][31][32][33][34]. In reality, this manuscript has the aim to provide a preliminary mechanical characterization of the material under study as the basis for the exploration of the thermo-mechanical issues.…”

Modelling of Residual Stresses in Dental Restorative Polymer Based Materials

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Mechanical Characterization of Sheet Moulding Composites for the Automotive Industry

“…The SMCs under study may be exposed in service to hostile conditions, e.g. service temperature, Tg near glass transition, cyclic loadings, or aggressive environments [15][16][17][18][19][20][21][22][23][24][25][26]. In particular the viscoelastic behaviour of the polymer matrix and its long-term behaviour can be altered by the vicinity of the glass transition temperature of the polymer itself [27][28][29][30][31][32][33][34][35][36][37].…”