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            <title xml:lang="en">Extended PDMS stiffness range for flexible systems</title>
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                <title xml:lang="en">Extended PDMS stiffness range for flexible systems</title>
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              <p>The use of polymers in the context of flexible systems such as flexible sensors leads to an incompatibility issue: On one hand, the flexibilty of the polymer must not be to the detriment of the fabrication process, e.g. excessive thermal expansion leading to process failure and on the other hand, certain applications will require high flexibility and also a specific mechanical stiffness, e.g. artificial skin, smart clothes, flexible screen. .. In other words, a compromise is necessary between rigidy for processing and controlled flexibility for applications. In this context it is crutial to be able to tune the mechanical properties of such polymers. Polydimethylsiloxane (PDMS) is a very versatile and useful soft polymeric material-Elastic modulus typically ≈1 MPa. This paper investigates the stiffness tunability of PDMS by varying the hardening agent to PDMS base ratio over 19:1 to 2:1, and using two extreme curing processes, i.e. 120 minutes at 100 o C and 2 days at 165 o C. It was observed that the stiffness of PDMS can be accuratly controlled from 800 kPa to 10 MPa with a rupture limit higher than 20 %. To our knowlegde this is the highest reported elastic modulus in PDMS by combining mixing ratio and curing temperature. The impact of such a stiffness variation on potential functional properties such as the rupture limit, Poisson's ratio and material's wetting contact angle is also analysed. We observe that the wetting contact angle depends on the bulk mechanical properties of the PDMS. The observations will be of use to all technological communities who are engaged in using PDMS-type polymers for their specific applications.</p>
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