PDMS elastic properties: influence of fabrication protocol and test method
arxiv(2024)
摘要
Silicone rubbers have been integral to the rapid development of microfluidic
devices and flexible electronics in recent decades. Polydimethylsiloxane,
commonly abbreviated as PDMS and produced using the brand name Dow SYLGARD 184,
is a ubiquitous such rubber that is renowned for its ease of manufacturing and
biocompatibility. SYLGARD 184 is a soft polymer frequently used in the field of
mechanics, microfluidics, and electronics given the straightforward ability to
manipulate its material properties via tuning base to curing agent mix ratios
and curing schedules. However, this tuning process largely occurs on a case by
case basis via trial and error, without a comprehensive understanding of how
composition, temperature, or mechanical test method my alter the measured
elasticity. Here we compare the reported elastic response of PDMS SYLGARD 184
obtained using a range of mechanical testing methods and compositions to
investigate the variability. We also include previously unreported experimental
results obtained in our lab using Volume Controlled Cavitation Expansion
(VCCE). Both testing method and cure schedule (time and temperature of curing)
are found to strongly influence the measured elastic response resulting in
shear moduli that range over 3 orders of magnitude for chemical compositions
that are reported to be the same. While tension testing is a common test method
in mechanical analysis, the wide ranging moduli for stiff PDMS and complete
inability to measure softer PDMS compositions reveal the limits of this
standard method. As researchers in the field of mechanics strive to quantify
the properties of increasingly complex biological and composite materials,
converging on a standardized measurement of PDMS is necessary, and is a
necessary first step for the community.
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