Tailoring of silicone elastomer’s properties and its use in smart materials (keynote lecture)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F21%3A63546338" target="_blank" >RIV/70883521:28610/21:63546338 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Tailoring of silicone elastomer’s properties and its use in smart materials (keynote lecture)

Original language description

Polydimethylsiloxane (PDMS) elastomer is due to its low cost, optical transparency and simple fabrication frequently used as a substrate for manufacturing lab-on-a-chip and microfluidic devices. Moreover, its low shrinkage rates and ability to replicate microscale features makes the PDMS a suitable candidate for soft litography processes. On the other hand, this silicone elastomer possesses also several disadvantages such as poor chemical stability reflecting in swelling by organic solvents or the distortion of flow diverting structures under pressure or external force. To prevail the pros of PDMS over its cons, tailoring the structure is a promising route to extend PDMS’s application potential. The high elasticity and low hardness of PDMS are other materials benefits offered by PDMS which can be further tailored by the extension of the elastomer cross-links with non-bonded silisone-based material in a bulk. Thus, various amount of silicone oil was added to the uncurred PDMS represented by frequently used Sylgard 184 in this study. The effect of the silicone oil on the mechanical properties of the Sylgard 184 cured at different temperatures were evaluated via tensile testing, compressive testing and Shore A evaluation. As was statistically proved, the amount of silicone oil portion has significant effect on all the tested properties and its effect on hardness was further evaluated in application of Sylgard 184 as an elastomeric matrix in magnetorheological elastomers (MREs). Magnetorheological elastomers are basically multi-phase composite materials whose rheological properties can be varied by application of an external magnetic field. Generally, MREs consist of an elastomeric matrix containing micron-sized ferromagnetic particles dispersed within. The elastic character of the matrix enables only limited movement of dispersed magnetic particles which differs MREs from so-called MR suspensions. The magnetic particles can be incorporated into the elastic body either randomly, i.e. isotropic MREs, or in ordered structures, i.e. anisotropic MREs. The locked chain structures within the elastomer system correspond to a low dipolar energy state which is disordered during the shearing of the whole system. However, the energy state monotonically increases with increasing external magnetic field application resulting in a field-dependent shear modulus. Thus, the coupling of magnetic field allows development of tuneable elastic modulus with the giant deformational effect depending on the type of elastomeric matrix, which opens opportunities of MREs in various powerful actuators such as artificial muscles or sensors. Furthermore, the photoactuation performance of such systems was investigated for the first time in this study.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

<a href="/en/project/EF16_028%2F0006243" target="_blank" >EF16_028/0006243: The Development of Capacity for Research and Development of TBU in Zlín</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů