Preparation of a Cage-Type Polyglycolic Acid/Collagen Nanofiber Blend with Improved Surface Wettability and Handling Properties for Potential Biomedical Applications

Flue gas desulfurization ash (FGD) is a byproduct of flue gas desulfurization facilities. Its comprehensive utilization has attracted increasing interest. In this work, FGD is used as the reinforcing filler to improve the mechanical properties of carboxylated styrene-butadiene rubber (XSBR). The effects of FGD on the curing characteristics, microtopography, and mechanical properties of the composites were studied. The results indicated that FGD can be uniformly dispersed in XSBR and effectively improve the mechanical properties of XSBR composites. The tensile strength of the XSBR/25FGD composite reaches 14.0 MPa, approximately 19.7% higher than that of pure XSBR. Even if the incorporation of FGD reaches 45 phr, the tensile strength is still higher than that of pure XSBR. The composites obtained a lower rate of thermal degradation than XSBR. The DMA properties of the composites may be improved by the appropriate amount of addition. This work provides a new method for making more effective use of FGD in the polymer field, which has significant economic and environmental benefits.

Section: Micromorphology Of Xsbr/fgd Compositesmentioning

confidence: 99%

Preparation and properties of carboxylated styrene‐butadiene rubber/flue gas desulfurization ash composites by in situ carboxylate reaction

Zhuang

Shi

Wang

et al. 2022

“…97 As a result, there are still hurdles in simplifying the synthesis approach, enhancing recycling and flame retardant efficiency, suggesting appropriate routes for various requirements, and increasing biodegradability and nontoxicity. 117,118 Moreover, the reversible dynamic covalent bonds in RFRs have a lower bond energy than traditional covalent bonds, which indicates that the thermal stability and chemical resistance of the materials will suffer significantly. 119 Sometimes, thermoset recycling processes are relatively difficult to achieve, such as light induction or long times of high temperature and pressure.…”

Section: Challenges and Opportunitiesmentioning

confidence: 99%

“…Additionally, assessing the ecological hazard and biodegradability of RFRs would be an intriguing new study area in the upcoming years. 117,118 Another option is to change the synthesizing process to improve recycling and fire resistance. One study possibility is the efficient synthesis of dynamic bonds and more aromatic structures with P-N-Si, P-Si-B, and P-N-B incorporating fire retardants that can perform in both condensed and gaseous phases while also being recyclable.…”

Section: Challenges and Opportunitiesmentioning

confidence: 99%

Review on intrinsically recyclable flame retardant thermosets enabled through covalent bonds

Rashid

Liu

Wei

2022

Developing thermosets with inherent recyclability and flame retardancy is a great importance from the views of fire safety, resource conservation and environmental protection. Owing to their superior mechanical properties, versatility, outstanding adhesion‐ability, durability, thermal, and solvent stability comparable to conventional thermosets while demonstrating end‐of‐life reuse, recyclable thermosetting materials have gained much interest as an attractive class of sustainable thermosets. The chemical structure of thermosets includes dynamic covalent networks that provide durability and reprocessability. However, these recyclable thermosets possess significant flammability, limiting their application in automobiles, railways, aircraft, buildings, and electronic items. Thus, it is urgent to include them with flame retardants. The goal of this review paper is to give a broad understanding of the study by highlighting and discussing recent advances as well as future prospects for inherently recyclable flame retardant thermosets (RFRs). Moreover, synthesis methods have been highlighted to improve the design of internally recyclable fire retardant thermosets. A distinct emphasis will be given on the inherent RFRs in terms of flame retardancy, recycling property, physical properties, and thermal stability. Finally, we will explore the importance and threats that intrinsically recyclable flame retardant thermosets face in the future.

“…21 El-Ghazali et al revealed that fiber diameter can affect cell infiltration behavior. 22 Normally, MEW scaffolds are designed with homogeneous porosity or microarchitecture, which is conducive to maintaining consistent cell performance and conducting monoculture studies. 18 However, internal architectures vary in different regions of biological tissues.…”

Section: Introductionmentioning

confidence: 99%

“…Zhang et al showed scaffolds with aligned fibers can regulate the differentiation of stem cells and even promote tendon repair 21 . El‐Ghazali et al revealed that fiber diameter can affect cell infiltration behavior 22 …”

Section: Introductionmentioning

confidence: 99%

Design, fabrication, and analysis of spatially heterogeneous scaffold by melt electrospinning writing of poly(ε‐Caprolactone)

Zhang

Cao

Zaeri

et al. 2022

Melt electrospinning writing (MEW) that processes molten polymers has emerged as a reliable method to fabricate high-fidelity fibrous tissue scaffolds for investigation of cell biological performance as a function of structural features. However, most of the current investigations have focused on the scaffolds with homogeneous features, which can yield homogeneous cell performance outcomes as expected. In contrast, spatially heterogeneous scaffolds with well-defined, nonuniform pore attributes can serve as biomimetic, multiplexed platforms for biological investigations. In this study, an analytically derived general heterogeneous toolpath design model is introduced. In addition to the traditional orthogonal fiber orientations, fiber placement along diagonal directions is introduced to generate semi-0-θ patterned or 0-θ patterned heterogeneous scaffolds. By specifying model parameters and hence tuning the relative location of the diagonal fibers to orthogonal fibers, the customized heterogeneous scaffolds produced can possess at most three different pore morphologies. The various distributions of different pore morphologies within one scaffold are subsequently mapped by an advanced mathematical matrix method for the first time. Moreover, the proportion of different pore morphologies of semi-0-θ patterned scaffolds can be obtained numerically. Finally, this proposed analytical design model is preliminarily validated by fabrication using a MEW printing process.