Alarqam Zyaad Tareq

Materials utilized for impact protection must be capable of effective absorption and dissipation of external impact forces as well as being lightweight, flexible, and comfortable. One strategy to meet these stringent criteria is through the exploitation of adaptive dynamic networks. Herein, we report a series of chain-extended supramolecular polyurethane and poly(urethane–urea) elastomers, which utilize both hydrogen bonding interactions and disulfide units to impart structural stability, reprocessability, and reversible adaptability. The key design element of these phase-separated materials is the use of two distinct dynamic bonding mechanisms within the hard domains, which serve to efficiently reinforce the elastomeric assemblies. The optimum elastomer exhibited excellent self-recoverability (91% and 99%) after relaxing for 30 and 60 s, respectively, at 20% compression. During loading–unloading compression cycles, the elastic recovery ratios of this elastomer reached 77 ± 0.3% with dissipated energies of 235,000 J m^–3 at a deformation of 80%. This study highlights how the combination of noncovalent interactions and dynamic covalent bonding can be utilized to generate elastomers capable of rapid autonomous healing and property recovery while simultaneously providing exceptional energy dissipation, paving the way for the impact-resistant systems.

To address the current needs of the pharmaceutical industry, this study demonstrates how the design of LMWGs can be exploited to tune self-assembled nanostructured gel morphologies to enable the selective crystallisation of polymorphous APIs.

Photoresponsive polymeric hydrogel lattices have been generated using stereolithographic 3D printing to afford objects that can change shape when irradiated with UV-vis light that are capable of exhibiting payload release.

This paper reports the synthesis and study of crosslinked polyurethanes that possess sulfone ethyl urethane chain-extenders which provides base triggered self-immolative degradation properties – notably for use in debond-on-demand processes.

Organic dyes are mostly used in textile, paper, plastic, and other industries. These industries can be toxic and harmful to environment and human. Adsorption is the most efficient method to control wastewater that contains dyes. Cellulose-Chitosan beads was mainly used in the adsorption. To increase and enhance the organic dyes removal capacity of these beads, titanium dioxide nanowires (TiO _2Nw ) as used to achieve novel Cs-Cell-nanowires hybrid composites. Ultralong hydroxyapatite nanowires was prepared and used to enhance the mechanical and thermal properties of beads. On the other hand, the beads composition was prepared with spherical white shape. Internal structure of beads and other composition were studied by using Attenuated Total Reflectance (ATR) spectroscopy, scanning electron microscopy (SEM), lazer diffraction (LD), thermal analysis (TG, DSC, DTG, and DTA). The beads are tested with five different organic dyes which include Methyl blue (MB), Acid alizarin Black (AAB) as cationic dyes, and Methyl orang (MO), Methyl red (MR) and Eriochrome black T (EBT) as anionic dyes. The results indicate that the beads have the ability to remove MB, EBT,AAB but do not have the ability to remove MO and MR. So, the Cell-CS- HAP _Nw - TiO _2Nw beads can be considered as the promising adsorption for MB, EBT, and AAB from aqueous solutions.

Phase transfer catalysis P.T.C is one of the most widely used techniques in the preparation of a wide range of compounds not only in organic chemistry but also a broadly useful in several other areas of chemistry. There have been extensive studies that have been used to synthesize many compounds that are biologically important with highly efficient and the percentage of the product and purity are high with perfect time. In this study, a number of chalcones were prepared and reacted with phenoxy acetamide, 4-methyl phenoxy acetamide and phenyl mercapto acetamide for the preparation of 2–pyridones compounds under phase transfer catalysis conditions. The reaction mechanism and the structure of the resulting compounds were determined using physical analysis methods IR and ¹ H-NMR. ¹³ C-NMR was also measured for some compounds.