ABSTRACT Wound ulceration induces inflammation, delays tissue repair, and may trigger systemic infections, thereby endangering bodily health. Hydrogel films are capable of accelerating wound healing processes. This study fabricated polyvinylpyrrolidone/polycaprolactone (PVP/PCL) nanofiber‐hydrogel membranes via juxtaposed electrospinning, overcoming the limitations of traditional electrospinning techniques. Hydrophilic PVP (15% w/v in ethanol with 0.03% DAS) and hydrophobic PCL (15% w/v in chloroform/ N , N ‐dimethylformamide (CF/DMF) 4:1) were employed, with PVP/PCL ratios precisely regulated. The optimal VC‐8/2 (PVP/PCL = 8:2) exhibited excellent performance, featuring a viscosity of 176.5 cp, a smooth, bead‐free morphology prior to swelling (diameter: 718.22 ± 142.96 nm), and a twisted structure post‐swelling (diameter: 268.71 ± 94.21 nm)—all enabled by optimized solvents and juxtaposed electrospinning that eliminated phase separation. Additionally, the VC‐8/2 demonstrated a tensile strength of 1.16 ± 0.10 MPa, an elongation at break of 94.35% ± 5.64%, and a 40% water absorption rate after 12 h. Attenuated total reflectance Fourier transform infrared spectroscopy (ATR‐FTIR) confirmed the successful cross‐linking of PVP, while CCK‐8 assays revealed high L929 cell viability (87.23%–91.44%), exceeding the 85% non‐cytotoxic threshold. These biocompatible membranes integrate the exudate absorption capacity of PVP and the mechanical support of PCL, rendering them highly promising for advanced wound dressing applications.

ABSTRACT Incorporating functional groups capable of interacting with gas molecules into the molecular structure is a pivotal strategy for enhancing the performance of polymer‐based gas separation membranes. In this study, two diamines featuring spiro‐bis‐indane moieties and distinct functional groups were separately polymerized with 4,4′‐(hexafluoroisopropylidene) diphthalic anhydride (6FDA) to synthesize two polyimide membranes. The effects of hydroxyl (OH) groups and phenylamino (NHPh) groups on gas separation performance were systematically investigated. Hydroxyl groups are known to enhance CO 2 solubility via hydrogen‐bond‐like interactions while disrupting chain packing to increase free volume, synergistically improving separation efficiency. This work further demonstrates that the basic phenylamino groups selectively adsorb CO 2 through Lewis acid–base interactions, boosting CO 2 solubility and amplifying solubility differences with nonpolar gases. Additionally, the rigid spiro‐bis‐indane structure collaborates with these functional groups to tailor the microporous network, thereby optimizing gas transport properties.

ABSTRACT Thiourea derivatives are powerful hydrogen‐bond donors that have revolutionized small‐molecule catalysis, but their integration into polymer frameworks remains comparatively underexplored. Thiourea‐based polymers offer unique advantages, including tunable architectures, enhanced stability, and recyclability, but challenges in synthesis, functional stability, and active‐site distribution hinder wider application. This mini‐review critically highlights advances from hydrogen‐bonding catalysis to emerging polymerization and post‐functionalization strategies, identifies key research gaps, and outlines opportunities for designing multifunctional catalytic polymers. By bridging molecular thiourea chemistry with macromolecular design, this review provides a timely perspective to guide sustainable catalysis and expand the role of thioureas in polymer science.

ABSTRACT Processing complex coacervates has become a topic of increasing consideration. Herein, the use of solution blow spinning (SBS) of complex coacervates into fiber mats as another processing method is discussed. Complexes of poly(styrene sulfonate) and poly(diallyldimethylammonium chloride) at 50/50 charge fraction in a KBr solution are spun with an in‐house‐built SBS apparatus at pressures of 25–45 psig, box wall to substrate distances of 5–20 cm, salt concentrations of 1.6–1.7 M KBr, polymer concentrations of 0.1–0.25 M, and run speeds of 0.2–3 mL/min. The results show that increased fiber density and decreased fiber diameter dispersion occur with decreasing distance to the substrate. An increase in fiber layering with decreasing run speed and improved fiber uniformity during the spinning of pre‐loaded samples is observed. Fiber diameter averages ranged from approximately 7–50 μm, with narrower diameter distributions and denser mat formation at shorter spray distances (5–10 cm). Optimal morphology occurred near 30 psig and 1.7 M KBr with a 5 cm spraying distance, where fibers were most uniform and densely packed. This research lays the groundwork for complex coacervate processing via solution blow spinning, highlighting several parameters that influence the resulting fiber morphology.

ABSTRACT 3D entrapment of polymers in nanocavities is crucial for a variety of synthetic and biomimetic materials, including hollow particles. We evaluate the effect of chain stiffness on the properties of polymers entrapped in cavities/capsules using molecular simulation. Two confinement‐induced phenomena are found to control the polymer distribution ρ ( r ) across the closed sphere. The near‐wall entropic depletion, characteristic of flexible polymers, manifests itself in monotonous profiles similar to those around a solid sphere in open systems. Contrarily, in moderately stiff polymers, the confining surface generates distinct density enrichment in profiles due to the development of toroidal conformations. The energetics of toroidal growth in a semidilute solution is quantified by simulation. The computed bending energy confirms a simpler generation of toroids in short polymers. The observed reduction of the persistence length in a cavity facilitates the growth of toroids. The thickness of the depletion layer determined by the novel universal method is in agreement with the data from the restricted conventional method. A close relationship is demonstrated between the concentration changes in the depletion thickness and the radius of gyration. The relevance of the computed confinement effects to bioanalytical or biomedical applications of capsules/hollow particles is discussed.

ABSTRACT Although degradability and stability are generally incompatible, polymers that degrade through nonnatural stimuli can exhibit high durability, even if they are highly degradable. 2‐Thioethyl ester can be degraded into carboxylic acid by the oxidation of sulfide to sulfone using nonnatural oxidant followed by the treatment with base. Polyesters containing the 2‐thioethyl ester structure are synthesized. After the sulfide group is quantitatively oxidized to sulfone by mCPBA, the sulfone polyester dissolves even in sodium carbonate solution via the base‐promoted β‐elimination. The one‐shot oxidative degradation of sulfide polyester is achieved by the treatment with hydrogen peroxide solution in the presence of sodium tungstate as a catalyst and sodium carbonate as a base. The oxidation of sulfide to sulfone occurs only at the surface of the polyester particles, and further oxidation takes place after the sulfone layer is removed via β‐elimination. Polyesters with the structure of 2‐thioethyl ester are stable during use, but can be converted to the monomer at the desired instant after use.

ABSTRACT Poly(butylene adipate terephthalate) (PBAT) and polylactic acid (PLA) exhibit inherent thermodynamic incompatibility. To enhance the compatibility between the two phases, three kinds of graft compatibilizers with different main‐chain structures, named as PBAT‐ g ‐VCHO, PLA‐ g ‐VCHO, and PBS‐ g ‐VCHO, are synthesized by grafting 4‐vinyl epoxycyclohexane (VCHO) onto PBAT, PLA, and PBS, respectively, which employs a melt grafting approach and uses diisopropylbenzene peroxide as the initiator. The findings confirmed the successful synthesis of the three compatibilizers, and the water contact angle results showed that each of the three compatibilizers effectively reduced the interfacial tension between the PBAT and PLA phases. Specifically, the three compatibilizers are applied into PBAT/PLA composites, and the influence of the compatibilizer grafting rate and dosage on the properties of composites is discussed. Comparative analyses demonstrated that optimal performance of the composites is achieved with grafting rates of 1.64% for PBAT‐ g ‐VCHO, 1.71% for PLA‐ g ‐VCHO, and 1.56% for PBS‐ g ‐VCHO, corresponding to addition contents of 10%, 7.5%, and 7.5%, respectively. Overall, the results indicated that the PBAT/PLA composite exhibits the best comprehensive performance with the addition of the compatibilizer PBS‐ g ‐VCHO with a grafting rate of 1.56% and a content of 7.5%.

ABSTRACT This work reports a bio‐based polybenzoxazine vitrimer that simultaneously achieves high glass transition temperature ( T g ), excellent reprocessability, and outstanding chemical resistance. The synthesis involves first esterifying phloretic acid with tyrosol to form bisphenol ester (BPE), which then undergoes Mannich condensation to yield the benzoxazine monomer, finally polymerized via ring‐opening to afford ester‐containing polybenzoxazine vitrimer (PEBZ). Because of the dynamic transesterification reactions (TERs), PEBZ has processable performance. The tensile strength retention rates of PEBZ after three times reprocessing were 90.4%, 72.1%, and 57.0%. PEBZ also has excellent thermal performance. The T g is as high as 217°C, and its thermal decomposition temperatures T d5 and T d10 are 338°C and 369°C, respectively, with a carbon yield of 40.3%. These thermal characteristics remain basically unchanged after three post‐treatment cycles. Due to the high crosslinking density and rigid framework of benzoxazine, PEBZ has excellent chemical resistance. This polybenzoxazine vitrimer achieves a unity of high performance and recyclability, providing a broader range of application scenarios for processable materials.