机械性能

Abstract(#br)A novel polydimethylsiloxane/liquid crystal cross-linked membrane (PDMS/LC) was prepared by using PDMS containing vinyl groups and LCs containing unsaturated linkages as matrix materials. Mechanical properties, liquid crystalline performance and blood compatibility of the PDMS/LC cross-linked membrane containing different LC contents and LC groups were investigated, respectively. The results showed that mechanical properties of the membrane increased more significantly than those of pure PDMS membranes.

Abstract(#br)Procedure to establish full contact between the sample and the 1\u003cce:hsp sp=\"0.25\"/\u003emm diameter cylindrical flat punch tip to measure polydimethylsiloxane (PDMS) mechanical properties using the Hysitron TriboIndenter is described. This procedure differs from the standard automated indentation because each indent has to be performed manually after establishing full contact with the sample surface. Incomplete contact happens because of the sample tilt with respect to the flat punch surface and results in incorrect elastic modulus values.

Abstract(#br)The mechanical strength and interfacial behavior have been of great significance for composite membranes. In this work, an in-situ nano-indentation/scratch technique was employed to probe mechanical properties and interfacial adhesion of ceramic-supported polydimethylsiloxane (PDMS) composite membranes. The nanostructures of active, transition and support layers were systematically correlated with measured mechanical and adhesive properties, as well as interfacial morphologies and separation performance.

Abstract(#br)This work introduces the design of a smart soft composite (SSC) hinge actuator capable of a pure bending motion concentrated on specific sections of the actuator. This actuator makes use of a shape memory alloy (SMA) wire in a polydimethylsiloxane (PDMS) matrix embedded with segmented rigid components. The bending deformation was accomplished by actuating the SMA wire embedded along the length of the matrix eccentrically from neutral surface.

Abstract(#br)Periodontal disease if left untreated can result in creation of defects within the alveolar ridge. Barrier membranes are frequently used with or without bone replacement graft materials for achieving periodontal guided tissue regeneration (GTR). Surface properties of barrier membranes play a vital role in their functionality and clinical success. In this study polyetherurethane (PEU) membranes were synthesized by using 4,4′-methylene-diphenyl diisocyanate (MDI), polytetramethylene oxide (PTMO) and 1,4-butane diol (BDO) as a chain extender via solution polymerization.

Abstract(#br)Polydimethylsiloxane (PDMS) is one of the widely-used silicone-based organic polymers. It can serve as a substrate to grow cells, mainly because of its controllable range of mechanical properties. Varying the degree of crosslinking in the polymer network allows tuning its mechanical properties in a range similar to living tissues. To study the PDMS stiffness effect on the growth and behavior of cells, it is of significant importance to explore the mechanical properties of a series of PDMS samples cured to different crosslink densities.

Abstract(#br)An absolutely novel membrane of Poly (vinylchloride- co -vinylacetate) (PVCA) copolymer and polydimethylsiloxane (PDMS) with five different ratios were fabricated and used for further characterizations. Dense membranes of 50 μm were synthesized with ratios of PDMS and PVCA 99:1, 98:2, 97:3, 96:4 and 95:5 respectively. The separation performance is characterized by permeation studies of pure gases CO 2 , N 2 and CH 4 at two different temperatures i.e. 25 °C and 75 °C and pressure of 10 psi.

Polydimethylsiloxane (PDMS) is widely utilized in material science, chemical engineering, and environmental science due to its excellent properties. By utilizing fillers, so-called composite materials can be obtained with enhanced mechanical, wettability, or thermal conductivity performance. Here, we present a simple, cost-effective approach to vary either the mechanical properties (Young’s modulus) or surface wettability of bulk PDMS and PDMS sponges simply by adding nanodiamond filler with different surface terminations, either oxidized (oND) or hydrogenated (reduced, rND) nanodiamond.

We present a study of radiolucent composite materials for use in medicine, providing suitable mechanical properties and high resistance against sterilization decomposition. The composites are composed of carbon (C), aramid or glass (R-glass) fabrics embedded in polydimethylsiloxane (PDMS), polyetheretherketone (PEEK) or polyphenylene sulfide (PPS) matrix. The effect of multiple steam sterilization processes on degrading the mechanical properties, structural integrity and hydrolytic decomposition of the composites was verified. The radiolucency of the composites was also investigated.

The goal of this study was to create polydimethylsiloxane (PDMS) and microcrystalline cellulose (MCC) composites with high mechanical properties and antimicrobial activity. Vinyl-terminated PDMS was mixed with bifunctional filler, which combines MCC stiffness and antimicrobial properties of silver nanoparticles. To provide antimicrobial properties the silver nanoparticles in situ were synthesized by chemical reducing method in MCC aqueous suspension. Silver nanoparticles (AgNPs) concentration deposited on MCC particles surface was varied.