Thermoplastic silicone elastomers based on Gemini ionic crosslinks

2020 ◽  
Vol 11 (46) ◽  
pp. 7382-7392
Author(s):  
Sijia Zheng ◽  
Yang Chen ◽  
Michael A. Brook
Keyword(s):  
Silicone Elastomers ◽  
Ionic Crosslinks

Gemini ionic crosslinks produced by neutralization of dicarboxylic and diamino silicones lead in a facile manner to thermoplastic silicone elastomers.

Autonomous self-healing polyisoprene elastomers with high modulus and good toughness based on the synergy of dynamic ionic crosslinks and highly disordered crystals

2020 ◽  
Vol 11 (41) ◽  
pp. 6549-6558
Author(s):  
Yohei Miwa ◽  
Mayu Yamada ◽  
Yu Shinke ◽  
Shoichi Kutsumizu
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Self Healing ◽  
High Modulus ◽  
Disordered Crystals ◽  
Ionic Crosslinks

We designed a novel polyisoprene elastomer with high mechanical properties and autonomous self-healing capability at room temperature facilitated by the coexistence of dynamic ionic crosslinks and crystalline components that slowly reassembled.

Magnetically Active Silicone Elastomers: Twenty Years of Development

INEOS OPEN ◽  
2020 ◽  
Vol 2 (6) ◽  
pp. 178-184 ◽  
Author(s):  
E. Yu. Kramarenko ◽  
◽  
G. V. Stepanov ◽  
A. R. Khokhlov ◽  
◽  
...  
Keyword(s):  
Silicone Elastomers

Constitutive Model of Radiation Aging Effects in Filled Silicone Elastomers under Strain

2021 ◽  
Vol 125 (35) ◽  
pp. 10047-10057
Author(s):  
A. Maiti ◽  
W. Small ◽  
M. P. Kroonblawd ◽  
J. P. Lewicki ◽  
N. Goldman ◽  
...  
Keyword(s):  
Constitutive Model ◽  
Aging Effects ◽  
Silicone Elastomers

scholarly journals Enhancement of Acid Stability of Silicone Elastomers by Using Inert Fillers

2020 ◽  
Vol 27 (6) ◽  
pp. 2188-2194
Author(s):  
Fabian Lehretz ◽  
Jorg Krebler ◽  
Michael Nase ◽  
Mirko Rennert ◽  
Jan Schulte-Fischedick ◽  
...  
Keyword(s):  
Acid Stability ◽  
Silicone Elastomers

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

Ionic Crosslinking of Carboxylated SBR

1983 ◽  
Vol 56 (5) ◽  
pp. 942-958 ◽  
Author(s):  
Kyosaku Sato
Keyword(s):  
Zinc Oxide ◽  
Carbon Black ◽  
Elevated Temperatures ◽  
Ion Clusters ◽  
Ionic Crosslinking ◽  
Reinforcing Fillers ◽  
Ionic Bonds ◽  
Tan Δ ◽  
And Shifts ◽  
Ionic Crosslinks

Abstract 1. Ionic bonding of carboxylated SBR with zinc oxide is detectable by means of measurements of the temperature dependence of tan δ. There is an α peak in the region of 60°C at 3.5 Hz. The position and shape of the α peak are strongly dependent on the state of cure of the vulcanizates. Without permanent crosslinking, the α peak is a plateau; as the crosslink density increases, the α peak becomes sharper and shifts to lower temperatures. The presence of carbon black causes the α peak to shift to higher temperatures, regardless of the presence of permanent crosslinks. 2. Ionic bonds in carboxylated SBR reacted with zinc oxide are in the form of ion clusters which function as crosslinks at room temperature. The ionic crosslinks provide carboxylated SBR with high tensile strength in the absence of reinforcing fillers. The presence of carbon black causes the 300% modulus to increase. The ionic crosslinks are labile, and the strength is lost at moderately elevated temperatures. A mixed cure system consisting of both sulfur and zinc oxide provides higher heat resistance than either of the single cure systems.

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