Gel point investigation of liquid silicone rubber using rheological approaches

Weißer, Dennis F.; Shakeel, Ahmad; Mayer, Dennis; Schmid, Johannes; Heienbrock, Simon J.; Deckert, Matthias H.; Rapp, Bastian E.

doi:10.1016/j.polymer.2023.126286

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…The fast gelation has further been proved quantitatively using a rheometer, in which the storage modulus ( G ′) of (PEI/PDDA)/(PAA/PSS)/ACS self-gelling powders intersects with the loss modulus ( G ″) at 3 s upon adding phosphate-buffered saline (PBS) buffer (Figure G). A higher storage modulus ( G ′) than the loss modulus ( G ″) indicates the successful transformation from powders to hydrogels. , The gelation time of other similar hydrogel powders has been reported to be around 2 s , The prolonged gelation time of our self-gelling powders is due to the incorporation of ACS, whose hydrophobicity would affect the interaction between its polymeric chains and the surrounding liquid.…”

Section: Resultsmentioning

confidence: 78%

“…A higher storage modulus (G′) than the loss modulus (G″) indicates the successful transformation from powders to hydrogels. 5,34 The gelation time of other similar hydrogel powders has been reported to be around 2 s 5,36 The prolonged gelation time of our self-gelling powders is due to the incorporation of ACS, whose hydrophobicity would affect the interaction between its polymeric chains and the surrounding liquid. Then, we conduct time scan and frequency scan experiments to assess the stability of the hydrogel.…”

Section: ■ Results and Discussionmentioning

confidence: 82%

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Robust and Wet Adhesive Self-Gelling Powders for Rapid Hemostasis and Efficient Wound Healing

Zhao,

Sun,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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Healing traumatic wounds is arduous, leaving miscellaneous demands for ideal wound dressings, such as rapid hemostasis, superior wet tissue adhesion, strong mechanical properties, and excellent antibacterial activity. Herein, we report a self-gelling, wet adhesive, stretchable (polyethylenimine/poly-(dimethylammonium chloride)/(poly(acrylic acid)/poly(sodium styrenesulfonate)/alkylated chitosan)) ((PEI/PDDA)/(PAA/ PSS)/ACS) powder as a new option. The self-gel utilizes noncovalent interactions among in situ formed PDDA/PSS nanoparticles and PEI/PAA polymetric matrices to earn sensational mechanical properties and tensile strength while incorporating ACS to obtain fast hemostasis and therapeutic capacities. The powder can form a hydrogel patch in situ within 3 s upon liquid absorption, capable of resisting pressure higher than twice the blood pressure. Deposition of the self-gelling powders on various wounds, such as rat liver and femoral artery wounds, can stop bleeding in 10 s and lessen the amount of bleeding 6-fold plus in corresponding models. Furthermore, the self-gelling powders can significantly advance the chronic wound healing process by displaying a high wound healing rate and a low inflammatory response and promoting the formation of new blood vessels and tissue regeneration. The satisfactory mechanical properties, strong wet adhesion, sufficient antibacterial properties, ease of usage, adaptability to complex wounds, rapid hemostasis, and superior therapeutic capacities of (PEI/PDDA)/(PAA/PSS)/ACS self-gelling powders render them as a profound wound dressing biomaterial.

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Section: Resultsmentioning

confidence: 78%

Section: ■ Results and Discussionmentioning

confidence: 82%

Robust and Wet Adhesive Self-Gelling Powders for Rapid Hemostasis and Efficient Wound Healing

Zhao,

Sun,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…The EI is used to describe the elastic properties of the sample. The storage or elastic modulus are equivalent terms for G ′ [40]. The formula for the EI shows that there is a positive correlation between EI and the elastic modulus G ′ plateau at the platform.…”

Section: Effect Of a Crosslinking Agent On The Microrheological Prope...mentioning

confidence: 99%

The Effects of a Crosslinking Agent on the Microrheological Properties and Cellular Structure of Silicone Rubber Foam Prepared via a Green Process

He,

Li,

Liu

et al. 2024

Materials

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Chemical foaming technology is widely used in the preparation of silicone rubber foam and is attributable to its one-step molding capability and eco-friendly production processes. The microrheological properties of silicone rubber play a pivotal role during the foaming process. In this study, Rheolaser Lab (Formulaction, Toulouse, France) was used to conduct in situ examinations for the influence of a crosslinking agent on the microrheological properties of silicone rubber foam for the first time. This study monitors the entire reaction process of silicone rubber foam from liquid to solid, as well as the matching of crosslinking and foaming reactions. Various parameters, including solid–liquid balance, elasticity index, and macroscopic viscosity index, are measured to analyze the microrheological properties of silicone rubber foam. The results show that the silicone rubber foam exhibits good microrheological properties, thereby demonstrating excellent performance at a crosslinking agent content of 2%. Through adjusting the experimental conditions, a sustainable and efficient approach was proposed for better cellular structure control in the industrial preparation of silicone rubber foam.

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Adhesion‐controlled anisotropic rotational molding of multilayered ultrasoft silicone films

Kaufmann,

Schlicht,

Rösel

et al. 2024

Polymer Engineering & Sci

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Rotational molding allows the manufacturing of geometrically complex, hollow parts while maintaining low tool costs. While the rotational molding of thermoplastics is subject to inherent limitations regarding the wall thickness and processing of ultrasoft materials, the present paper introduces the adhesion‐controlled, highly dynamic rotational molding of room‐temperature curing resins, enabling the fabrication of thin, multilayered films and anisotropic, ultrasoft silicone components at rotational speeds up to 2000 min−1. The studies comprise the influence of the applied rotational speeds and the different molds. Based on scanning electron micrographs, the process is shown to allow for locally tailored part thicknesses, enabling the manufacturing of multilayered films with singular layers obtaining thicknesses below 10 μm. Relying on the control of emerging centripetal forces, the rotational speed depicts a quasi‐linear influence on resulting layer thicknesses, allowing for controlling the film thickness with excellent interlayer bonding. Relying on the superposition of consecutive layers, the adhesion‐controlled process allows for tailoring emerging nonlinear, ultrasoft stress–strain behaviors across a broad range of desired moduli. Conducting compression tests, increased rotational speeds are shown to reduce the part stiffness, attributed to the increased relative influence of interlayer interfaces, allowing for reproducing mechanical characteristics similarly found in ultrasoft human soft tissue.Highlights Highly dynamic rotational molding of ultrasoft thin films. Targeted anisotropic structure formation. High geometric accuracy and reproducibility of thin silicone films. Targeted adaptability of nonlinear compressive mechanical properties. Applicability for ultrasoft laryngeal implants.

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Gel point investigation of liquid silicone rubber using rheological approaches

Cited by 4 publications

References 11 publications

Robust and Wet Adhesive Self-Gelling Powders for Rapid Hemostasis and Efficient Wound Healing

Robust and Wet Adhesive Self-Gelling Powders for Rapid Hemostasis and Efficient Wound Healing

The Effects of a Crosslinking Agent on the Microrheological Properties and Cellular Structure of Silicone Rubber Foam Prepared via a Green Process

Adhesion‐controlled anisotropic rotational molding of multilayered ultrasoft silicone films

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