最新刊期
卷 32 ， 期 2 ， 2019
- 摘要：Compared with fullerene acceptor, non-fullerene acceptor possesses the advantages of strong absorptions and tunable energy levels, thus enabling the improvement of power conversion efficiencies (PCEs) for fullerene-free polymer solar cells (PSCs). This article summarizes the progresses in non-fullerene acceptors developed in our group, and mainly introduces two design strategies: one is to ultilize dihedral angle and steric hindrance to construct non-planar small molecule acceptors, the other is to use intramolecular non-covalent interactions to construct planar small molecule acceptors. Both strategies are employed to address the following key challenges: to settle the dilemma between the formation of proper nanoscale phase separation and effective π-π stacking of non-fullerene molecules; to have the features of easy-synthesis and excellent morphological stability. Finally, we outline a perspective on the future development of non-fullerene acceptors.关键词：Non-fullerene acceptors;Polymer solar cells;Molecular designing strategy;Molecular geometry;Morphology
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发布时间：2022-09-02 - 摘要：With the increased incidence and mortality of cardiovascular diseases, vascular transplantation has been becoming an important approach to deal with the related issues. The small-diameter vascular grafts prepared by electrospinning, which can mimic natural extracellular matrix, are beneficial to cell adhesion and proliferation. Additionally, electrospun fibers can effectively load bioactive substances such as growth factors, peptides and miRNAs, thereby achieving the functions of local delivery and controlled release. This review focuses on the recent achievements in preparation of electrospun vascular grafts loading with bioactive substances for enhancing small-diameter vascular regeneration.关键词：Small-diameter vascular grafts;Electrospinning;Bioactive substances;Vascular regeneration
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发布时间：2022-09-02 - 摘要：As a biodegradable material,aliphatic polyester has a wide range of applications in the field of biomedical materials. By introducing and designing branched structure, the hydrophilicity, biocompatibility and processing performance of polyester materials can be improved, and the degradation behavior of materials can be regulated. In this paper,the research progress of branched aliphatic polyesters in recent years is reviewed in terms of their topological structure, synthesis methods and material properties. At the same time,a synthesis method of star-comb graft polyesters is provided. The future development trend and application prospect of aliphatic polyester are also prospected.关键词：Branch;Aliphatic polyesters;Star-comb;Dendrigraft
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发布时间：2022-09-02 - 摘要：The benzoic-imine generated from amine and benzaldehyde groups is an interesting dynamic covalent bond. The bond is stable around neutral pH value (~7.4) arising from the existence of aromatic ring nest to the carbon-nitrogen double bond, while starts to hydrolyze at very mild acidic pH,e.g. the extracellular pH value of solid tumors (6. 5~6. 8). The hydrolysis kinetics can be tunable by the acidity of the environmental conditions, which becomes faster at endosome and lysosome pH values (ca. 4.5~6.5). These merits are promising to design and construct physiological pH responsive materials with tunable morphologies including polymeric aggregates, polymer/inorganic nanocomposites,microgels and bulk injectable hydrogels. Many potential applications have been demonstrated for delivery vehicles and/or scaffolds for tissue engineering. In this review,we summarizes the recent progresses in the design and synthesis of benzoic-imine dynamic bond contained polymeric systems for biomedical applications.关键词：Benzoic-imine;pH Responsible;Injectable hydrogel;Drug delivery;Tissue engineering
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发布时间：2022-09-02 - 摘要：The surface properties of biomaterials play a decisive role in the realization of their biocompatibility and biological functions. Diversified interface properties can be imparted to the biomaterial surfaces by surface modification through polymers. The introduction of reactive and functional units on those polymer chains could integrate multifunction and ultimately determine the application area of biomaterials. This review summarized the recent developments in the polymer-modified biomaterials surface and its related research and proposed some current challenges in the field.关键词：Biomaterials;Surface modification;Modification through polymers
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发布时间：2022-09-02 - 摘要：As one of the main rubber matrix materials of damping products, the fatigue resistance of NR vulcanizate is unsatisfied, which seriously affects the service life of products. Herein, we introduce high trans-1, 4-butadiene-isoprene copolymer rubber TBIR into traditional NR damping rubber formulation for the first time. The structure and properties of NR/TBIR rubber with different blending ratios were studied. The results showed that TBIR and NR had good compatibility; at the same time, the vulcanization rates of TBIR and NR were close to each other, resulting in well-matched vulcanization rate. In addition, NR/TBIR vulcanizates had lower compression heat,higher hardness and resilience, and more outstanding flexural fatigue resistance. Furthermore, NR/TBIR vulcanizates displayed satisfied damping properties, for instance, good dynamic and static stiffness ratio and low compression permanent deformation. Consequently, the application of TBIR in damping products can significantly improve the service life of products with satisfied comprehensive performances.关键词：Damping;Natural rubber;Trans-1, 4-(butadiene-co-isoprene) copolymer rubber;Fatigue resistance
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发布时间：2022-09-02 - 摘要：Two novel conjugated polymer acceptors (PTO and NTO) were designed and synthesized. PTO and NTO possess alkoxy-substituted thiophene as electron donor moiety and ethynyl moiety as the π-bridge in the conjugated polymer backbone,while perylene diimide (PDI) or naphdiimide (NDI) moiety are used as electron acceptor moiety in their conjugated polymer backbones. Both PTO and NTO exhibited broad light-absorption spectra and low lowest unoccupied molecular orbital energy levels (>—3.80eV). All-polymer solar cells (all-PSCs) were fabricated using these copolymers as electron acceptors and a medium-bandgap conjugated polymer, PBDB-T, as the electron donor. The resulting all-PSCs based on NTO exhibited a power conversion efficiency of 3.7%, which is higher than that of the devices with PTO as acceptor (2. 8%). The performance improvement was attributed to the higher open-circuit voltage, greater charge carrier mobility of the PBDB-T:NTO based devices.关键词：Alkoxy-substituted thiophene;Conjugated polymer acceptors;All-polymer solar cells
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发布时间：2022-09-02 - 摘要：Bacterial cellulose-based hydrogels are considered to have potential applications in wastewater treatment owing to their loose porous and environmental friendliness. In this research, we utillize the graphene oxide and the attapulgite to enhance the adsorption performance of bacterial cellulose/polyvinyl alcohol composite hydrogel, and have tested it with the dye congo red (CR) as an example. The FTIR,XRD, SEM,BET and TG-DSC analysis results indicate that after the enhanced hydrogel has better hydrophilicity, larger specific surface area and good thermal stability. In the adsorption tests,we find the adsorption exhibited a pseudo-first-order kinetics and Freundich isothermal. The enhanced hydrogel has a better swelling property and thus higher adsorption capacity, especially under acidic conditions. In addition, the prepared hydrogels show reusability for the efficient removal of CR. Consequently, our hydrogels are expected to be used as adsorbents in acid dye wastewater treatment.关键词：Bacterial cellulose;Polyinyl alcohol;Graphite oxide;Attapulgite;Adsorption;Congo red
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发布时间：2022-09-02 - 摘要：Novel compatibilized ABS/PA6 blends were prepared via reaction extrusion approach. Their non-isothermal crystallization process was studied by differential scanning calorimetry (DSC), which was further analyzed by Jeziorny modified Avrami equation. Results showed that the non-isothermal crystallization of the developed ABS/PA6 blends conform to the modified Avrami equation. At primary crystallization stage, heterogeneous nucleation mainly occurred, probably because ABS introduction during reaction extrusion process may act as heterogeneous nucleation role, accelerating the growth of crystal nuclei.关键词：Polyamide6;Acrylonitrile-butadiene-styrene;Reaction extrusion;Non-isothermal crystallization
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发布时间：2022-09-02 - 摘要：A large amount of volatile organic compounds (VOCs) will be produced in the production and use of rubber products. It will not only be harmful to human health, but also bring about secondary pollution such as the photochemical smog and atmospheric acidification. Under the background of tightening environmental policies and rising social concerns, it is urgent to realize green production and reduce VOCs emission in rubber products manufacturing industry. In this review, we focus on the reasons for VOCs emission in the production process of rubber products, including raw rubber, filling oil, carbon black, the silicification reaction of silica,volatile sulfur compounds and the waste rubber recycling, and summarize the corresponding methods for reducing VOCs emission. Finally, the research progress of the end treatment technology of VOCs in rubber products industry is complementally introduced.关键词：Rubber;Volatile organic compounds;VOCs;Exhaust gas
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发布时间：2022-09-02 - 摘要：Thermal degradation of aliphatic polyesters into their corresponding lactones and then repolymerizing these monomers into polyesters with identical properties is a green and effective closed-loop method for polyester recycling. This method takes the advantages of the chemical equilibrium between polymer and monomer at different temperatures, and has been successfully applied to the recycling of a variety of commercial available aliphatic polyesters. To expand the scope of polyesters suitable for thermal recycling, new polyesters with good mechanical properties and low cost have been designed and prepared. This review paper will discuss the relationship between thermal recycling and polyester structures, including mechanism, recycling efficiency, together with recent advances in this field.关键词：Aliphatic polyester;Thermal recycling;Polymerization-depolymerization equilibrium
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发布时间：2022-09-02 - 摘要：Hyaluronic acid (HA) is the main component of the extracellular matrix (ECM) and is widely used in anticancer drug delivery. It is biocompatible, biodegradable,non-toxic, non-immunogenic and rich of carboxyl, hydroxyl function groups. Moreover, cancer cells have increased number of HA receptors in contrast to normal cells. Thus,the antitumor drug delivery system prepared with hyaluronic acid has active targeting for the high CD44-expressing tumor cells. In this paper, the research progress of antitumor drug carriers based on hyaluronic acid was summarized in the field of prodrugs, organic carrier materials (micelles, liposomes,nanoparticles,microbubbles, hydrogels, etc.),and inorganic composite carrier materials (nano gold, quantum dots, carbon nanotubes,silicon dioxide, etc.).关键词：Hyaluronic acid;Antitumor drug carriers;Prodrugs;Drug delivery
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发布时间：2022-09-02 - 摘要：The all conjugated polymer solar cell has the advantages of adjustable energy level of the receptor, wide absorption range and solution processing, and has become a development trend in the field of solar cells. Through the optimization of materials and device structure, the energy conversion efficiency of the device has exceeded 10%. Among them, the phase separation microstructure of the blend system is a key factor that restricts the further improvement of the photoelectric conversion efficiency of organic solar cells. In the blend system with crystalline components, due to the change of the phase behavior of the components themselves, the understanding and understanding of the relationship between crystallization and phase separation and the particularity of the phase separation mechanism of the crystallization system are more conducive to effective adjustment of the total The yoke polymer phase separation structure. Based on the traditional polymer phase separation theory and the classical theory of polymer crystallization, combined with the uniqueness of the conjugated polymer structure, this paper summarizes the phase separation structure characteristics and difficulties of the fully conjugated polymer blend system, focusing on thermodynamics and kinetics. The aspects describe the basic methods and principles of controlling the phase separation structure, and further improve the mechanism of phase separation of conjugated polymers.关键词：All conjugated polymer solar cells;Phase separation;Crystallization;Orientation
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发布时间：2022-09-02 - 摘要：In this review, different kinds of methods for preparation of polyamide microspheres have been summarized, and their advantages and disadvantages are evaluated. The recent progress in the preparation of polyamide microspheres by reaction-induced phase reversion, especially in our research group, has been highlighted. Furthermore, we sum up the advancement on the application of the microspheres in Selective-Laser-Sintering (SLS),adsorption and other fields. The existing problems and future development of polyamide microspheres are also analyzed.关键词：Polyamide microspheres;Phase separation;Reaction induced phase reversion;Polyamide nanocomposite microspheres
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发布时间：2022-09-02
The 30th Anniversary Issue II
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