scholarly journals Highly stretchable or extremely soft silicone elastomers? One reaction to make them all - from easily available materials!

2021 ◽  
Author(s):  
Pengpeng Hu ◽  
Jeppe Madsen ◽  
Anne Ladegaard Skov
Keyword(s):  
Mechanical Properties ◽  
Soft Tissues ◽  
Maximum Strain ◽  
Silicone Elastomers ◽  
Shear Moduli ◽  
Curing Reaction ◽  
Precursor Polymers ◽  
Highly Stretchable ◽  
Bottle Brush

Abstract An easy curing reaction to prepare silicone elastomers is reported, in which a platinum catalyzed reaction of telechelic/multi-hydrosilane (Si-H) functional polydimethylsiloxane (PDMS) in the presence of oxygen and water leads to slow crosslinking. This curing chemistry allows versatile tailoring of elastomer properties, which exceed their intrinsic limitations. Both highly stretchable silicone elastomers and extremely soft silicone elastomers are prepared by creating highly entangled elastomers and bottle-brush elastomers from commercial precursor polymers, respectively. The highly stretchable elastomers can be uniaxially stretched to a maximum strain of 2800% and their areas can be biaxially extended 180-fold. The extremely soft silicone elastomers exhibit shear moduli of 1.2-7.4 kPa, depending on composition, values that are comparable to hydrogels and human soft tissues. The reported curing chemistry can be used to prepare a range of silicone elastomers with carefully tailored mechanical properties.

scholarly journals Development of a 3D Printable and Highly Stretchable Ternary Organic-Inorganic Nanocomposite Hydrogel

2021 ◽  
Author(s):  
Chen Hu ◽  
Malik Haider ◽  
Lukas Hahn ◽  
Mengshi Yang ◽  
Robert Luxenhofer
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Nanocomposite Hydrogel ◽  
Highly Stretchable ◽  
Manufacturing Techniques ◽  
Advanced Applications

Hydrogels that can be processed with additive manufacturing techniques and concomitantly possess favorable mechanical properties are interesting for many advanced applications. However, the development of novel ink materials with high...

scholarly journals 3D Printing of High Viscosity Reinforced Silicone Elastomers

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2239
Author(s):  
Nicholas Rodriguez ◽  
Samantha Ruelas ◽  
Jean-Baptiste Forien ◽  
Nikola Dudukovic ◽  
Josh DeOtte ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
New Technologies ◽  
Three Dimensional ◽  
High Viscosity ◽  
Layer By Layer ◽  
Silicone Elastomers ◽  
Uv Curable ◽  
Octet Truss ◽  
Tunable Mechanical Properties

Recent advances in additive manufacturing, specifically direct ink writing (DIW) and ink-jetting, have enabled the production of elastomeric silicone parts with deterministic control over the structure, shape, and mechanical properties. These new technologies offer rapid prototyping advantages and find applications in various fields, including biomedical devices, prosthetics, metamaterials, and soft robotics. Stereolithography (SLA) is a complementary approach with the ability to print with finer features and potentially higher throughput. However, all high-performance silicone elastomers are composites of polysiloxane networks reinforced with particulate filler, and consequently, silicone resins tend to have high viscosities (gel- or paste-like), which complicates or completely inhibits the layer-by-layer recoating process central to most SLA technologies. Herein, the design and build of a digital light projection SLA printer suitable for handling high-viscosity resins is demonstrated. Further, a series of UV-curable silicone resins with thiol-ene crosslinking and reinforced by a combination of fumed silica and MQ resins are also described. The resulting silicone elastomers are shown to have tunable mechanical properties, with 100–350% elongation and ultimate tensile strength from 1 to 2.5 MPa. Three-dimensional printed features of 0.4 mm were achieved, and complexity is demonstrated by octet-truss lattices that display negative stiffness.

scholarly journals Effect of Isocyanate Absorption on the Mechanical Properties of Silicone Elastomers in Polyurethane Vacuum Casting

ACS Omega ◽  
2021 ◽  
Vol 6 (7) ◽  
pp. 4687-4695
Author(s):  
Martin Wortmann ◽  
Philipp Krieger ◽  
Natalie Frese ◽  
Elmar Moritzer ◽  
Bruno Hüsgen
Keyword(s):  
Mechanical Properties ◽  
Silicone Elastomers ◽  
Vacuum Casting

A Nanoindentation Method for Hydrated Compliant Materials

2011 ◽  
Author(s):  
Donna M. Ebenstein
Keyword(s):  
Mechanical Properties ◽  
Soft Tissues ◽  
Adhesion Forces ◽  
Surface Detection ◽  
Heterogeneous Samples ◽  
Mineralized Tissues ◽  
Fluid Interactions

Nanoindentation is becoming an increasingly popular tool in the biomaterials field due to its ability to measure local mechanical properties in small, irregularly-shaped or heterogeneous samples.1 Although this technique was readily adapted to the study of mineralized tissues, the application of nanoindentation to compliant, hydrated biomaterials such as soft tissues and hydrogels has led to many challenges.1 Three key concerns associated with nanoindentation of compliant, hydrated materials are inaccurate surface detection, errors due to adhesion forces, and fluid interactions with the tip.1–4

Inexpensive, semi-automated system for measuring mechanical properties of soft tissues

1999 ◽  
Vol 284 (4) ◽  
pp. 374-378 ◽  
Author(s):  
David E. Alexander ◽  
Kenneth L. Ratzlaff ◽  
Ricardo J. Roggero ◽  
Jennifer S.-Y. Hsieh
Keyword(s):  
Mechanical Properties ◽  
Soft Tissues ◽  
Automated System

The Convexity Properties of the Fung Model for Soft Tissues

2001 ◽  
Author(s):  
J. Patrick Wilber ◽  
Jay R. Walton
Keyword(s):  
Mechanical Properties ◽  
Nonlinear Elasticity ◽  
Continuum Mechanics ◽  
Soft Tissues ◽  
Basic Tool ◽  
Nonlinear Continuum Mechanics ◽  
Pathological Conditions ◽  
Convexity Properties ◽  
Nonlinear Continuum ◽  
Fung Model

Abstract During the last three decades, the theory of nonlinear elasticity has been used extensively to model biological soft tissues. The now widely accepted belief that an understanding of the mechanical properties of these tissues is critical in order to understand the advent, progression, and treatment of disease has driven this research. More recently, those interested in how soft tissues grow and remodel themselves in response to both normal and pathological conditions have used nonlinear continuum mechanics as a basic tool.

Effect of methacrylic acid and pendant vinyl groups on the mechanical properties of highly stretchable core–shell nanostructured films deposited from water

2021 ◽  
Author(s):  
James Turton ◽  
Stephen Worrall ◽  
Muhamad S. Musa ◽  
Amir H. Milani ◽  
Yichao Yao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Methacrylic Acid ◽  
Core Shell ◽  
Nanostructured Films ◽  
Highly Stretchable

The mechanical properties of these highly stretchable, water deposited elastomers can be tuned by varying MAA content and vinyl functionalisation.

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