Characterization and analysis of aging properties of rice husk reinforced PLA/PBAT composites.

This research investigates how decontamination changes the properties of N95 mask strap assemblies and examines the ability of materials characterization techniques to detect these changes. The mechanical response of the mask strap assembly was found to be a reliable method to evaluate degradation of the mask strap material due to decontamination, both in the strap and at its attachment point.

Preparation of uric acid biosensor based on hollow fiber gradient membrane.

Bio-based chitosan composite membranes containing kraft or organosolv lignin submitted to successive extraction steps (ethyl acetate and ethanol) are immersed in a sulfuric acid solution. This process incorporates sulfate groups and disrupts crystallinity, which improves oxidative stability, increases water uptake, and enhances the biocomposite's proton conductivity and H₂/O₂ fuel cell performance, while maintaining low bulk electron conductivity.

A novel superhydrophobic/superoleophilic sponge material (rGO@PDMS/PU) with excellent photothermal conversion ability was prepared and used for in situ recovery of high-viscosity oil and organic solvents. Under the irradiation of 1 sunlight intensity, the rGO@PDMS/PU's surface temperature rises to 95.4°C within 10 s. The new oil-gathering device increases the crude oil recovery rate by nearly four times.

PVA was grafted to the copolymer of acrylonitrile (AN) and acrylic acid/sodium acrylate using N,N′-methylenebisacrylamide comonomer–crosslinker. Silver nanoparticles were synthesized in situ in the polymerization mixtures by reduction of AgNO₃ with ascorbic acid. These nanocomposites were characterized and used for the removal and photocatalytic degradation of p-nitrophenol (PNP) from water. The nanocomposite showed high adsorption and photocatalytic degradation of PNP from water.

This paper presents a way to prepare long-chain branched polypropylene and propylene–ethylene copolymer by one-step reactive processing involving the sequential incorporation of maleic anhydride and m-xylylenediamine into the reactive medium. The improvement of the melt strength of the polymers is accomplished without substantially altering their average molecular weights, tensile mechanical properties, and crystallinity.

A series of hexa-imidazole ion cluster norbornene anion exchange membranes (aPNB-CTPP-2MI-x) with different ion contents were prepared by using cyclotriphosphazene based hexa-imidazole compounds as a crosslinking agent. The unique structure of aPNB-CTPP-2MI-x membrane makes it have excellent ionic conductivity and alkali resistance stability.

Intrinsic and easy upcycling capability is introduced into polystyrene by incorporating α-methylstyrene structural units into the copolymer. Then, these copolymers can undergo depolymerization into styrene and α-methylstyrene without catalyst. In addition, the properties of the new copolymers prepared with the reclaimed monomers are comparable with those of the virgin copolymers.

The wollastonite (WT) shows a good mechanical reinforcement effect on PDMS.

The optimized PDMS/WT/ZB/ATH/GP system passes the UL-94 V-0 rating and exhibits an increased limiting oxygen index.

WT is effective in reducing the peak heat release rate and delaying ignition.

The flame retardant mechanism attributed to WT accelerates the eutectic reaction and facilitates the formation of a ceramic barrier at low temperatures.

Relationships between the molecular and phase structure, and performances of proton-exchange membranes based on PFSA and PVA partially acetalized by CBA were elucidated. The blend membrane with good comprehensive performance and reduced cost was obtained.

Kinetic curves of conversion rate α and time t during thermal degradation, as well as the thermal degradation products that may be produced by polyamide materials.

The relationship between entanglement density and tribological performance of UHMWPE: (a) the structural evolution of UHMWPE molecular chains under reciprocating friction, (b) COF of GUR 4130 at different temperatures, and (c) COF of UHMWPE with different molecular weights.

A Ag⁺-responsive, water-soluble supramolecular polymers was prepared through host–guest interaction between γ-CD and the bis(phenyl ethenyl)pyridine guest monomer M1. When AgPF₆ was added into the solution of the supramolecular polymer, AgBr and bis(phenyl ethenyl)pyridine monomer-PF₆ precipitated out of the solution, leaving only the host molecule γ-CD in the solution, resulting in the depolymerization of the polymer.

The effects of exothermic characteristics of polyacrylonitrile-based precursor fibers and pre-oxidation conditions on thermal stabilization were studied. Significant differences in stabilization behavior show that the cyclization index (Ic), oxidation index (Io), dehydrogenation index (Id), and aromatization index (AI) of precursor fiber B are far greater than A. Different radial heterogeneous structure was observed, which mainly contributed to the stabilization degree and reaction rates. To promote oxygen diffusion, the Ic, Io, and AI values at the initial stage should be controlled below 0.8%, 0.36%, and 32%, respectively. Combined with actual industrialization, in order to avoid skin-core structure and violent reaction, selecting appropriate temperature procedure is necessary according to exothermic characteristics and stabilization behavior of specific fibers.

In this study, a series of fluorinated acrylate polymers (FAP) were synthesized by solution polymerization using perfluorohexylethyl methacrylate with a short fluorocarbon chain (PFOL, R _f = 6) and octadecyl acrylate with a long hydrocarbon chain (SA, R = 18). The synthesized FAP not only have excellent properties, but also avoid bioaggregation toxicity, making them ideal mold release materials. We present the synthetic reaction mechanism of the process and provide insights into the evolution of mold release agents for use in fluoroelastomers.

The work describes a facile method to fabricate multifunctional active food packaging films by incorporating chitosan/graphene oxide/Ag composites into polyvinyl alcohol membranes for preserving green plums and acerola fruits. The PVA/CS/GO/Ag film demonstrates significantly improved mechanical properties, water resistance, UV-blocking effect, and antibacterial efficiency compared to the pristine PVA film. The presented film also effectively prolongs the freshness and shelf life of packed fruits.