最新刊期
卷 54 ， 期 3 ， 2023
- 摘要：Ion-dipole interactions are supramolecular interactions in which oppositely charged dipoles and ions act as the substrate. The ion-dipole interaction has many properties, such as non-directional, non-saturation, self-healing and dynamic properties, which can give polymers excellent electrical and mechanical properties at the same time. These properties have given polymeric materials containing these interactions great potential for applications in flexible electronics and battery energy storage, and have attracted scientists to explore and develop these materials. The aim of this paper is to summarize the features and advantages of ionic-dipole interactions, while indicating the shortcomings in the field and attracting more scientists to the relevant research. We started from the types of materials containing ion-dipole interactions, introduces the possible acting substrates that can be used to build the materials, and explores how the different materials behave in terms of mechanical and electrical properties. It also combines our group's work on polymeric materials based on ionic dipole interactions, and concludes with a description of suitable application scenarios for such materials. For example, we discovered and exploited the ion-dipole interactions between fluorine-containing groups and imidazole cations to construct a self-healing ionic conductor. Applications include artificial muscles, artificial skin, ionic electroluminescence, and touch panels for wearable devices and human-machine interaction interfaces. Although there are currently a wide range of application scenarios for polymeric materials based on ion-dipole interactions, the development of related materials needs to be supported by fundamental science. For example, the regulation of electrical conductivity and mechanical properties can only be attempted by extensive experiments and not by more rational design.关键词：Noncovalent interaction;Supramolecular chemistry;Ion-dipole interaction
- 616
- |
- 200
- |
- 0
发布时间：2023-11-27 - 摘要：Polymer vesicles have an important application prospect in biomedical and other fields due to their unique lumen-membrane-corona structure. In this feature article, we highlighted recent advance in polymer vesicles for biomedical applications, including new mechanism and methods for self-assembly, and new biomedical applications. The former includes two principles of acid-induced adsorption and affinity-enhanced attraction for preparing vesicles with ultrahigh biomacromolecular loading efficiency, "micelle to vesicle transition" strategy for preparing asymmetric vesicles, fusion-induced particle assembly to build hierarchical vesicles, and ring-opening polymerization of N-carboxyanhydride-induced self-assembly to fabricate vesicles on a large scale; the latter includes vesicles for blood glucose control, vesicles to treat diabetic ulcers, antibacterial vesicles, anticancer vesicles, bone-targeting vesicles to treat osteoporosis and renoprotective angiographic vesicles. Finally, the future development of polymer vesicles and their potential biomedical applications are forecasted.关键词：Polymer vesicles;Macromolecular self-assembly;Biomedical materials;Fusion-induced particle assembly
- 339
- |
- 98
- |
- 0
发布时间：2023-11-27
Feature Article
- 摘要：Herein, based on the epoxide slow-release from cyclic carbonate and in situ capture strategy, we developed a novel telomerization reaction of PA/cyclic carbonates (ethylene carbonate, EC; propylene carbonate, PC) catalyzed by organic onium salt PPNTFA (bis(triphenylphosphine)iminium ammonium trifluoroacetate), enabling the fast, efficient and precise preparation of PA-based polyester polyol. The conversion of PA and the yield of targeted polymer were more than 99% after maintaining for 30 min at 180 ℃. Through changing the types and dosage of chain transfer agent, the key parameters such as microstructure, topology and molecular weight of the targeted polymer (Mn,SEC = 1300‒17700 g/mol) can be controllably adjusted. Moreover, the backbone structure of polyester polyol can be customized on demand by applying various cyclic carbonates.关键词：PA-based polyester polyol;Organocatalysis;Cyclic carbonate;Epoxide slow-release and in situ capture;Telomerization
- 361
- |
- 85
- |
- 0
发布时间：2023-11-27 - 摘要：During last decades, spherical DNA nanoparticles have been demonstrated as a powerful tool for delivering nucleic acids, small molecular drugs and protein, etc. While the importance of the sizes of such nanoparticles has been recognized in cell uptake efficiency, the investigation in detailed mechanism is still limited owing to the lack of tools to prepare size controllable nanoparticles. Herein, we have developed a strategy to construct spherical DNA nanoparticles (AuNP-Gx) with precise and controllable sizes, through the assembly of DNA modified gold nanoparticles and rigid DNA dendrimers (Y1 and Y2) in a layer-by-layer manner. The rigid DNA dendrimers were firstly assembled through three different single strands DNA . Each dendrimer structure (Y1 and Y2) was designed with the sticky-end segments which can further hybridize with the other Y. Therefore, through stepwise incubation with the gold particle core, different particles could be easily prepared through such only two components. The dynamic light scattering (DLS), agarose gel electrophoresis and transmission electron microscopy (TEM) showed that DNA dendrimers have been assembled around gold nanoparticles layer-by-layer, which indicated the successful preparation of AuNP-Gx with precise and controllable sizes. The prepared AuNP-Gx nucleic acid nanoparticles were successfully used to reveal the size effect of nucleic acid nanoparticle on the uptake efficiency of MCF-7 cells. From the experimental results, it could be observed that AuNP-G1 and AuNP-G0 performed the highest internalization efficiency for MCF-7 cells, while the internalization efficiency of the nanoparticles decreased gradually with the increase of the size. A size-controllable phospholipid vesicle with drug encapsulation and delivery potential was also constructed by using AuNP-Gx of different sizes as the frames and using the Frame-Guided Assembly strategy. Besides, the phospholipid vesicles were easily ingested by MCF-7 cells and showed good biocompatibility. This strategy provides a new tool for the design and development of drug carriers with specific dimensions, and a new theoretical support for the construction of novel and efficient DNA nanoparticle drug-loading systems.关键词：controllable size;spherical DNA nanoparticles;DNA self-assembly;Frame-guided assembly
- 419
- |
- 92
- |
- 0
发布时间：2023-11-27 - 摘要：To overcome the difficulties of purification and decolorization of bis(2-hydroxyethyl) terephthalate (BHET) that is associated with the recycling of wasted polyester (PET) textiles, this work studies the unique phase transition behavior of crystalline BHET in hope to find new and efficient purification strategies of the glycolysis product monomer of PET. With sublimation in vacuum, pure and decolorized BHET can be obtained with yield of up to 86.4%, purity of up to 99.7% and whiteness (L* value) of up to 99.8, respectively. Re-polymerization of the obtained purified BHET afforded recycled PET, which possessed similar properties with respective to the PET derived from petroleum-based BHET, including molecular weight, the distribution of molecular weight and whiteness, respectively. The effectiveness of this recycling strategy of wasted polyester textile was also verified by evaluating a series of PET samples, including PET textile blends and the real wasted polyester textiles that were picked from waste bins. This purification strategy of BHET requires less purification steps, affords high purity of the product, obviates the uses of toxic chemicals, avoids the high propensity of BHET powders to polycondensation under the commonly purification conditions and will provide a new strategy for high-quality recycling of waste polyester textiles.关键词：Recycling of waste polyester textiles;Purification of bis(2-hydroxyethyl) terephthalate;Decolorization of waste polyester;Glycolysis
- 352
- |
- 108
- |
- 0
发布时间：2023-11-27 - 摘要：A seven-membered cyclic acetal ester monomer (H-AE) was synthesized from biomass-based 3,4-dihydropyran. Structurally, this monomer introduces an acetal unit into γ-butyrolactone, which promises to afford poly(γ-butyrolactone) under mild conditions by releasing formaldehyde molecules during ring-opening polymerization. The judicious choice of Lewis pair catalysts substantially inhibits the back-biting side reactions during the polymerization process and realizes the entropy driven polymerization. We carefully studied the effects of the acid/basicity and the steric hindrance of the catalyst on the composition of the synthesized polymers. By designing and optimizing the catalyst structure, regulation of the ratio of poly(γ-butyrolactone) and poly(acetal esters) units was realized. With the help of NMR and SEC characterization of the polymer and the polymerization process, we confirmed that the obtained polymer is a random copolymer of poly(γ-butyrolactone) and poly(acetal ester). Finally, based on the experimental data and characterization results, we speculate that the polymerization follows the Lewis-pair mediated anionic ring-opening polymerization mechanism. Lewis acid and Lewis base act together on the active anion chain end to afford appropriate affinity and supress the back-bite side reaction while ensuring the release of formaldehyde.关键词：Ring-opening polymerization;Lewis pair;Cyclic acetal ester;Poly(γ-butyrolactone)
- 498
- |
- 109
- |
- 0
发布时间：2023-11-27 -
Mussel Adhesive Protein Inspired Chitin Nanowiskers Enhanced Adhesive Hydrogels for Wet Adhesion 增强出版
摘要：Aiming at the challenges of low mechanical adhesion and weak wet adhesion potential faced by the traditional adhesive hydrogels, a new design strategy for adhesive hydrogel is reported in this study. Inspired by the mussel adhesive protein and the synergistic effect between cations and catechols in wet adhesion, PAHU-CS-CNF hydrogel is synthesized via one-pot method copolymerizing acrylic acid (AA), hydroxyethyl methacrylate (HEMA) and 3-trienopentadecyl-1,2-catechol (UH) with protonated chitosan (CS) and chitin nanowiskers (CNF) in aqueous solution. Since the reversible physical interactions include electrostatic attraction, hydrophobic association among alkyl chains, π-π stacking of benzene rings, cation-π, hydrogen bonding and topological entanglement,the secondary networks formed by these physical bonds provide good energy dissipation for the hydrogel deformation. The synergistic effects of cations, catechols, and the water absorbability of PAHU-CS-CNF hydrogel that destructs the hydration layer on the contact interface,enable the hydrogel to form solid interfacial physical and chemical bonds interactions with wet porcine skin surface. These unique structures and mechanisms of PAHU-CS-CNF hydrogel lead to good mechanical properties (fracture strength ~276.4 kPa,toughness ~633 kJ/m3), excellent adhesion properties to porcine skin (interfacial toughness in wet state ~831 J/m2,interfacial toughness underwater ~236 J/m2,wound closure adhesion strength on skin ~26.2 kPa,wound closure adhesion strength on liver ~16.5 kPa), and the hydrogel is not easy to adhere to skin tissue in the presence of serum, given potential to prevent the wound tissue from secondary damage. The hydrogel has a great selective adhesion on biological tissue over nonbiological substrates. The PAHU-CS-CNF adhesive hydrogel may be potentially applied in the field of sutureless wound closure.关键词：Mussel adhesion protein;Hydrogel;Wet state adhesion;Adhesion toughness- 450
- |
- 112
- |
- 0
发布时间：2023-11-27 - 摘要：Silicone foam (SiF) decomposes in high-temperature heat flow or flame, leaving loose, fragile and easily collapsed residues, completely losing its original excellent characteristics such as sealing, heat insulation, and insulation. This problem may be well solved with the help of emerging high-temperature ceramizable technology. First, montmorillonite, low-melting glass powder, and layered double hydroxide (MgFe-LDH) are pre-mixed with silicone oil before SiF foaming, and then cross-linking and gas-generating foaming are carried out to obtain the high-temperature ceramizable SiF material. By characterizing the compressive strength, microscopic morphology, and crystal structure of SiF ceramic residues sintered at different temperatures, the ceramization evolution process of ceramizable SiF during high-temperature environments can be inferred. As a high-temperature ceramization synergist, LDH can not only reduce defects in SiF residues but also accelerate the ceramization transformation process of the material, and further enhance the mechanical strength of the ceramic residue. The compressive strength of the material after sintering at 1000 ℃ reaches 517 kPa, which is about 25 times higher than that of the original. Owing to the construction of the ceramizable system, the transformation of SiF to dense continuous, and tough ceramic foam in high temperature environment is realized, which provides a practical approach for the high-temperature fire resistance of SiF.关键词：Layered double hydroxide;High-temperature ceramizable synergist;Silicone foam;Ceramization evolution;High temperature resistance
- 241
- |
- 123
- |
- 0
发布时间：2023-11-27 - 摘要：The most prominent problem of thermoplastic polyurethane (TPU) as sole materials is that it has insufficient skid resistance and is easy to slip under humid or freezing environments. The changes of micro-morphology and deformation capacity of material surface caused by nano-fillers play an important role in the skid resistance. On the basis of blending high vinyl solution polymerized styrene butadiene rubber (HVSSBR) with TPU, the dispersion state of nano silica (SiO2) in TPU/HVSSBR (70/30) composites was investigated. And the friction properties of TPU/HVSSBR composites filled with different SiO2 contents under constant surface pressure were tested by LAT-100 machine on dry, wet friction surfaces and ice surface of different temperatures (-20, -10 and 5 ℃). The results showed that SiO2 was easily dispersed in HVSSBR rubber phase of TPU/HVSSBR blends, and the addition of SiO2 caused the difference of surface roughness and deformation ability of the material surface, resulting in the decrease of dry friction coefficient by 13.9%, the increase of wet friction coefficient by 8.7%; the maximum increase of friction coefficient at three kinds of ice surface temperatures (-20, -10 and -5 ℃) were 16.9%, 17.5% and 21.2% respectively. It is indicated that the addition of SiO2 can improve the friction coefficient of the material on smooth wet and ice surface and further improve the skid resistance of TPU.关键词：Thermoplastic polyurethane;High vinyl butadiene styrene rubber;Nano silica;Dry and wet friction;Ice friction
- 204
- |
- 83
- |
- 0
发布时间：2023-11-27 - 摘要：In this work, the effect of temperature and pressure on the viscoelasticity of the polyurethane elastomers is investigated via a coarse-grained molecular dynamics simulation. It is found that the storage modulus and loss modulus of polyurethane gradually decrease with the increase of temperature while the loss factor rises. The effect of pressure on the viscoelastic properties of polyurethane is opposite to that of temperature. Moreover, the loss factor of polyurethane is nearly independent of pressure. Then, the interaction energy, the order parameter and size of phases, the reduced interaction energy and heat exchange energy are calculated to understand the microscopic mechanism of the polyurethane viscoelasticity. The results show that the phase structures are mainly deformed during the shearing process, which produces more interfaces. In addition, the slippage between hard phase and soft phase beads becomes easier at a higher temperature or a lower pressure, which gradually reduces the dissipated energy.关键词：Polyurethane;Temperature;Pressure;Viscoelasticity;Molecular dynamics simulation
- 243
- |
- 72
- |
- 0
发布时间：2023-11-27
Research Article
- Postal code：100190
- Tel：010-62588927 Email：gfzxb@iccas.ac.cn
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备05002797号-8
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0