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Crosslinking Effect on Polydimethylsiloxane Elastic ...

Crosslinking Effect on Polydimethylsiloxane Elastic Modulus Measuredby Custom-Built compression InstrumentZhixin Wang, Alex A. Volinsky, Nathan D. GallantDepartment of Mechanical Engineering, University of South Florida, Tampa, Florida 33620 Correspondence to: A. A. Volinsky (E-mail: macroscopic compression test utilizing a simple custom-built instrument was employed to measure polydimethylsilox-ane (PDMS) Elastic modulus. PDMS samples with varying Crosslinking density were prepared with the elastomer base to the curingagent ratio ranging from 5 : 1 to 33 : 1. The PDMS network Elastic modulus varied linearly with the amount of crosslinker, rangingfrom MPa to MPa for the samples tested. PDMS Elastic modulus in MPa can be expressed as 20 MPa/PDMS base to curingagent ratio.)

Compression Instrument A custom-built compression test apparatus is shown schemati-cally in Figure 1. The stage is made from a thick polished gran-ite slab to provide a stable working platform and minimize vibration. The vertical post and the clamp are made from stain-less steel. The Mitutoyo digital depth gauge (Model 547-258,

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