Fabrication and characterization of carbon-based nanocomposite membranes for packaging application

Hyaline cartilage can be defined as a “biological bearing material” with an engineering approach. Movement causes friction between joints while lubricants provide separation between the two surfaces, reducing or preventing frictional wear. This study describes an injectable hybrid hydrogel consisting of a hyaluronic acid matrix filled with hexagonal boron nitride (hBN) particles that can mimic the rheological properties of joint fluid. hBN is a good lubricant and a strong candidate for biomedical applications with its unique tribological properties. The hypothesis established is that the lubricating property of hBN may alleviate the symptoms of osteoarthritis (OA) and improve the person's life quality. A new formulation and strategy for articular injections are proposed. The focus of the present work is the presentation of the rheological profile of hyaluronic acid‐boron nitride (HA‐hBN) hybrid hydrogels. Structural and physical characterizations have shown that BN‐HA hybrid hydrogels can be produced in injectable form, their compatibility with HA strongly depends on surface modification of BN, and they are promising candidates for the treatment of OA by evaluating the frequency range of walking and running.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of hybrid hydrogel to facilitate knee joint movement with an engineering approach

Göncü

2022

“…34 The sample was dried at 60 C for 24 h after immersion for 7 days and then weighted (w 7d ) again. 39 The above operation was repeated one more time and weighted again (w 14d ). The XSPU after water immersion test was referred to as XSPU-WT (XSPU after water immersion test).…”

Section: Stability and Degradation Testmentioning

confidence: 99%

Stability and degradation of four agricultural wastes liquefied polyols based polyurethane foams

Zhang

Hori

Takemura

2022

Bio-based polyurethane foam has attracted growing attention worldwide due to its advantages of environmental friendliness and wide range of raw materials. However, the stability and degradation ability of the newly prepared foams need to be further explored for their practical application. Four agricultural wastes (XS: oilseed rape straw/OS, rice straw/RS, wheat straw/WS, and corn stover/CS) liquefied polyols were used to replace petroleum polyol for preparing polyurethane foams (XSPU). These bio-based foams were investigated by Thermogravimetric analysis (TGA), Fourier transformed infrared spectroscopy (FTIR), two dimensional correlate infrared spectroscopy (2D-COS IR), water immersion test, soil burying test, and compression test to confirm their stability and degradation properties for applications. XSPU foams displayed excellent thermal stability with heating till to 240 C, appeared to change less than 0.3% in dry weight and contain more hydrogen bonds after immersing in water at 20 C for 14 days. The degradability of XSPU foams was significantly higher than that of petroleum polyol-based PU foam as their soft segments were easier to be decomposed, where the weight loss of XSPU was up to 46.7% after burying in the soil at 23 C and 50% relative humidity for 250 days. The compression recovery ability of these bio-based foams could reach approximately 98.2% after 1 $ 3 times of compression test. Generally, XSPU foams displayed excellent thermal stability, stability in water, degradability in soil, and elastic ability, which showed potential application in fields of insulation, degradable plastic, and elastomer.

“…Nanotechnology shows great potential in the preparation of high-performance polymer materials. [25][26][27] The mechanical properties of polymer composites can be enhanced by appropriate incorporation of nanofillers, such as starch, chitosan, cellulose nanocrystalline, CNTs and SiO 2 and so on. 28,29 Among them, starch as a degradable polymer has attracted much attention due to its lesser cost, high availability and biodegradability.…”

Section: Introductionmentioning

confidence: 99%

“…Nanotechnology shows great potential in the preparation of high‐performance polymer materials 25–27 . The mechanical properties of polymer composites can be enhanced by appropriate incorporation of nanofillers, such as starch, chitosan, cellulose nanocrystalline, CNTs and SiO 2 and so on 28,29 .…”

Section: Introductionmentioning

confidence: 99%

Improving the toughness and flame retardancy of poly (lactic acid) with phosphorus‐containing core‐shell particles

Dong

Wang

et al. 2022

Despite polylactide (PLA) representing one of the most promising biodegradable materials, its applications lag far behind owing to the disadvantages of inherent brittleness and flammability, which is challengeable to simultaneously overcome.In this work, a phosphorus-containing core-shell starch nanoparticle (FR-CSS) was synthesized via soap-free emulsion polymerization for concurrent improvement of toughness and flame retardancy of PLA. The results revealed that with the incorporation of 10 wt% FR-CSS, the elongation at break of PLA/10FR-CSS was prominently improved to 308% while the tensile strength was about 40.0 MPa. Particularly, the toughness of PLA/FR-CSS was as high as 108.2 MJ/m 3 , which was 48 times higher than that of neat PLA. Besides, the PLA/10FR-CSS exhibited improved flame retardancy with a UL-94 V-2 rating and a LOI value of 24.5%. These results established an integrated design strategy of incorporating phosphorus-containing core-shell nanoparticles to prepare PLA composites combined excellent toughness with enhanced flame retardancy, therefore broadening the application gallery of PLAs.