Designing reliable silicone elastomers for high-temperature applications

Ogliani, Elisa; Yu, Liyun; Mazurek, Piotr; Skov, Anne Ladegaard

doi:10.1016/j.polymdegradstab.2018.10.012

Cited by 17 publications

(18 citation statements)

References 34 publications

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“…This is most likely caused by the presence of further unreacted groups due to nonstoichiometric crosslinking reaction conditions, as discussed above. The presence of unreacted vinyl has previously been shown to decrease thermal stability 1 . However, the residual weights of blends at 900°C resulted in intermediate values, as expected from the combination of formulations with relatively low and high filler contents.…”

Section: Resultsmentioning

confidence: 86%

“…Silicone elastomers are becoming increasingly important in modern technology as a result of their multiple applications in soft robotics. Silicone elastomers' exceptional versatility for soft robotics arises from their inherent softness, as well as their thermal, and chemical stability 1,2 . The similarity of their mechanical properties to those of human muscles facilitates biomimicry 3,4 .…”

Section: Introductionmentioning

confidence: 99%

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Importance of Mullins effect in commercial silicone elastomer formulations for soft robotics

Krpovic

Dam‐Johansen

Skov

2020

J of Applied Polymer Sci

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Silicone elastomers are used in a wide range of applications, including artificial muscles, biomedical devices, and soft robotics, for which chemical, thermal, and mechanical stability are important requirements that these elastomers must fulfill. However, to ensure that silicone elastomers' properties and performance remain constant under long‐term deployment, it is necessary to examine and account for the Mullins effect, which has the potential to significantly alter certain elastomer properties of interest. In this article, the mechanical properties of soft and hard commercial silicone elastomers and two blends of commercial silicone elastomers are investigated—specifically their softening behavior due to the Mullins effect. Ultimate stresses, ultimate strains, and Young's moduli are obtained from uniaxial tensile tests. Results show that the point of softening greatly depends on both the elastomer type and its strain history. Furthermore, a significant permanent set is observed in the softest commercial formulations.

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Section: Resultsmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Importance of Mullins effect in commercial silicone elastomer formulations for soft robotics

Krpovic

Dam‐Johansen

Skov

2020

J of Applied Polymer Sci

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“…The condensation reaction allows efficient curing in ambient environment, which represents a significant advantage over silicone elastomers prepared by addition, radical, or UV curing. Besides the mild curing conditions, condensation curing silicone elastomer applications also benefit from the superior properties common to silicone elastomers, such as high flexibility, low surface energy, high chemical resistance, and excellent thermal stability [ 1 , 8 , 9 ]. Nevertheless, one drawback of condensation curing silicone elastomers is poor control over the curing reaction [ 6 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Reliable Condensation Curing Silicone Elastomers with Tailorable Properties

Jurásková

Olsen²,

Dam‐Johansen

et al. 2020

Molecules

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The long-term stability of condensation curing silicone elastomers can be affected by many factors such as curing environment, cross-linker type and concentration, and catalyst concentration. Mechanically unstable silicone elastomers may lead to undesirable application failure or reduced lifetime. This study investigates the stability of different condensation curing silicone elastomer compositions. Elastomers are prepared via the reaction of telechelic silanol-terminated polydimethylsiloxane (HO-PDMS-OH) with trimethoxysilane-terminated polysiloxane ((MeO)3Si-PDMS-Si(OMe)3) and ethoxy-terminated octakis(dimethylsiloxy)-T8-silsesquioxane ((QMOEt)8), respectively. Two post-curing reactions are found to significantly affect both the stability of mechanical properties over time and final properties of the resulting elastomers: Namely, the condensation of dangling and/or unreacted polymer chains, and the reaction between cross-linker molecules. Findings from the stability study are then used to prepare reliable silicone elastomer coatings. Coating properties are tailored by varying the cross-linker molecular weight, type, and concentration. Finally, it is shown that, by proper choice of all three parameters, a coating with excellent scratch resistance and electrical breakdown strength can be produced even without an addition of fillers.

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“…In this respect, wood adhesives emerge as a very important class considering the huge amount consumed worldwide [2,3,4]. AS also find application in the electronics, automotive, and energy sectors [5]. Among the different AS those based on silicone stand out due to their superior features, such as elasticity, versatility, good adhesion, durability, and UV resistance [5,6,7].…”

Section: Introductionmentioning

confidence: 99%

Brief Overview on Bio-Based Adhesives and Sealants

et al. 2019

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Adhesives and sealants (AS) are materials with excellent properties, versatility, and simple curing mechanisms, being widely used in different areas ranging from the construction to the medical sectors. Due to the fast-growing demand for petroleum-based products and the consequent negative environmental impact, there is an increasing need to develop novel and more sustainable sources to obtain raw materials (monomers). This reality is particularly relevant for AS industries, which are generally dependent on non-sustainable fossil raw materials. In this respect, biopolymers, such as cellulose, starch, lignin, or proteins, emerge as important alternatives. Nevertheless, substantial improvements and developments are still required in order to simplify the synthetic routes, as well as to improve the biopolymer stability and performance of these new bio-based AS formulations. This environmentally friendly strategy will hopefully lead to the future partial or even total replacement of non-renewable petroleum-based feedstock. In this brief overview, the general features of typical AS are reviewed and critically discussed regarding their drawbacks and advantages. Moreover, the challenges faced by novel and more ecological alternatives, in particular lignocellulose-based solutions, are highlighted.

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Designing reliable silicone elastomers for high-temperature applications

Cited by 17 publications

References 34 publications

Importance of Mullins effect in commercial silicone elastomer formulations for soft robotics

Importance of Mullins effect in commercial silicone elastomer formulations for soft robotics

Reliable Condensation Curing Silicone Elastomers with Tailorable Properties

Brief Overview on Bio-Based Adhesives and Sealants

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