Modulus and adhesion of Sylgard 184, Solaris, and Ecoflex 00‐30 silicone elastomers with varied mixing ratios

Abstract

Two-part, commercial silicone elastomers are used in a variety of fundamental soft materials research and industrial applications due to their wide availability, ease of use, low cost, and mechanical tunability. This work seeks to create a library of moduli for three common elastomer systems with varied mixing ratios: Sylgard 184, Solaris, and Ecoflex 00-30, as well as provide a comparison of their adhesive properties. Shear storage moduli are quantified using parallel plate oscillatory shear rheology. The work of debonding is measured with spherical probe adhesion testing, and the static, advancing, and receding contact angles are measured via goniometer. Sylgard 184 can have shear moduli ranging from $0.5 kPa-620 kPa, Solaris from $0.6 kPa-175 kPa, and EF from $1.3 kPa-35 kPa measured at a frequency of 0.01 rad/s. In general, increasing mixing ratios creates softer samples. Additionally, softer samples are universally more adhesive, regardless of the material system. When comparing the different material systems, Sylgard 184 is generally the most adhesive, followed closely by Solaris, and then by Ecoflex 00-30. Our study offers a baseline dataset of modulus values and comparative adhesion to help researchers determine an appropriate commercial silicone for their application.

Roughness tolerant pressure sensitive adhesives made of sticky crumpled sheets

“…Here we see the opposite trend with bulk (unstructured rectangular prisms) PDMS because the pull-off force in this geometry incorporates both G c and E which both change with crosslinking in PDMS. 23,40,44 Crumples have much lower adhesion forces than bulk samples, similar to what is seen with typical PSAs.…”

Pressure-Sensitive Supramolecular Adhesives Based on Lipoic Acid and Biofriendly Dynamic Cyclodextrin and Polyrotaxane Cross-Linkers

“…We employed 6.35 mm spherical probes of glass or PTFE to evaluate the adhesion of our formulations on a dynamic mechanical analyzer, inspired by recent reports employing spherical probes. ,, The probe-tack tests are divided into three stages (Figure ): load, dwell, and retract. First, the probe is brought into contact with the surface while being lowered slowly until a nonzero force (∼0.01 N) is registered.…”

“…The work of debonding for all of the adhesive formulations were measured using a dynamic mechanical analyzer (Anton Paar MCR-702) with a custom-built compression plate that serves as a probe indenter. The indenter fabrication and testing was similar to protocols reported in the literature. , The probe was constructed by bonding either a glass or PTFE (6.35 mm diameter) sphere securely on a flathead screw with high weld strength epoxy glue (J-B ClearWeld) and allowed to cure for at least 1 h. Upon ensuring sufficient adhesion between the sphere and screw, the screw side of the assembly was affixed to an 8 mm rheometer parallel plate (Anton Paar) with the epoxy glue. The red color of the ruby-doped glass sphere was leveraged to enhance contrast with the background in the photographs for accurate determination of contact area.…”

Erosion-resistant materials demonstrate low interfacial toughness with ice and superior durability

“…Using eqn (2), this silicone's interfacial toughness with ice could be estimated as minimally 16.4 J m À2 , using the thickness (1.2 mm) and elastic modulus (1.84 MPa) of the silicone layer. 48 However, it is unlikely that LEFM holds for the silicone/ice interface, as such hard/soft interfaces are known to cavitate and dissipate strain energy through the propagation of cavitation bubbles. 16 As shown in Fig.…”