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Rapid and facile self-assembly coatings play a crucial role in surface functionalization of materials. In this study, a safe, fast, and environmentally friendly method is proposed to form a metal-phenolic network (MPN) through the assembly of gallic acid (GA) and iron ions ([Fe.sup.3+]), which is used for the in situ polymerization coating of l,3,5,7-tetranitro-l,3,5-7-tetrazacyclooctane (HMX). The surface of the modified HMX crystals become visibly roughened. Thermoplastic polyurethane (TPU) was coated on the surface of modified HMX by water suspension method to form HMX@MPN@TPU double-layer core-shell energetic composite material. Compared with the raw material HMX, the [beta]-[delta] phase transition temperature of the double-layer core-shell structure composite increased by 12.36[degrees]C, the impact sensitivity and friction sensitivity decreased, and the compressive strength increased by 38%, which effectively improved its mechanical properties. Highlights * It has been demonstrated that metal-phenolic networks can self-assemble on the surface of crystals. * A water suspension method was employed to prepare energetic material powder into a polymer-bonded explosive (PBX). * The modified PBX showed significant improvements in various properties, indicating that metal-phenolic networks can serve as excellent modifying materials. KEYWORDS bilayer core-shell energetic composite, HMX, in situ polymerization method, metal-phenolic network, 1 | INTRODUCTION Energetic materials have the advantages of high energy density, high combustion speed, and high explosiveness, so they have attracted wide attention in the military field. (1-3) Among [...]

A new type of energetic composite with a double-coating structure was constructed by in-situ polymerization of dopamine and water suspension method. Using CL-20 with a particle size of 200–500 nm as the main explosive, the core–shell structured CL-20-p (CL-20@PDA) was prepared via self-polymerization of dopamine on the surface of the CL-20. After that, thermoplastic polyurethane (TPU, Estane5703) was used as the binder, the CL-20-p was coated by water suspension method, and finally CL-20-p/Estane5703 composite was prepared. The structure and properties of the samples were characterized by SEM, AFM, FTIR, XPS, Raman, XRD, DSC and mechanical sensitivity test. The test results show that the CL-20-p is successfully coated by Estane5703, and the coating degree is high. Compared with the CL-20, the crystal phase transition temperature of CL-20/Estane5703 is significantly increased, and the mechanical sensitivity is greatly reduced. The CL-20-p/Estane5703 is superior to CL-20-p and CL-20/Estane5703 in enhanced thermal stability and reduced mechanical sensitivity. [ABSTRACT FROM AUTHOR]

Background: To investigate the distribution pattern of V1+2d in the left superior pulmonary vein and its clinical significance. Methods: A retrospective analysis was conducted using three‐dimensional computed tomographic bronchography and angiography (3D‐CTBA) data from 500 lung cancer patients. Statistical analyses were performed to evaluate the incidence and drainage patterns of the three sub‐branches of V1+2d, namely V1+2d1, V1+2d2 and V1+2d3. Furthermore, clinical data from 10 patients' lesions involving V1+2d were reviewed to illustrate the impact of adjacency to V1+2d on the surgical approach. Results: The incidences of V1+2d1, V1+2d2 and V1+2d3 were 100%, 76.4% and 100% respectively. The relative interlobar distribution sizes of B3a and B1+2c and the left upper division (LUD) vein type influenced the incidence of V1+2d2 (p < 0.05; p < 0.001). V1+2d2 predominantly occurred in B3a = B1+2c and B1+2c > B3a patterns. V1+2d2 was entirely absent in the B3a > B1+2c pattern. V1+2d2 exhibited a higher incidence in both the central vein (CV) type and the noncentral vein (NCV) type when compared to the semi‐central vein (SCV) type (100% vs. 100% vs. 64.8%). The most prevalent venous drainage pattern was the three sub‐branches of V1+2d constituting a major trunk to drain (41.2%). All 10 cases with lesions involving V1+2d successfully underwent sublobar resection with no complications, and the surgical margin was ≥2 cm. Conclusions: The three sub‐branches of V1+2d exhibit a high incidence with diverse distribution patterns, yet a discernible pattern exists. For inter‐ or multi‐intersegmental nodules involving V1+2d, combined segmentectomy and subsegmentectomy or combined subsegmentectomy can ensure the safe margin. [ABSTRACT FROM AUTHOR]