最新刊期
卷 56 ， 期 3 ， 2025
- 摘要：With the increasingly emphasizes on sustainable development, exploring efficient, green, safe, and economical new sustainable polymerization methodologies has become a central focus in polymer synthesis. To address the limitations of chain polymerization primarily relying on metal catalysts to regulate chain ends, we have recently developed an innovative concept of anion-binding catalytic polymerization, where the hydrogen bond donors could leverage non-covalent anion-binding interactions to dynamically bind, recognize and activate propagating species, thereby achieving ideal polymerization activity and selectivity. This article begins by reviewing the development and representative research progress in ring-opening polymerization (ROP) of O-carboxyanhydrides (OCA). It then revisits and organizes our series of research efforts for addressing key challenges in this area, with a particular focus on the background and establishment of the anion-binding catalytic polymerization method. Finally, we discuss the future development trends of this emerging catalytic polymerization approach. We believe that utilizing non-covalent interactions to catalyze challenging ionic polymerization represents a promising new direction in polymerization catalysis, which will significantly contribute to the sustainable development of polymer science and its associated industries.关键词：Anion-binding catalytic polymerization;O-carboxyanhydride;Ring-opening polymerization;Sustainable polymerization methods;Non-covalent catalysis287|19|0更新时间：2025-02-27
Feature Article
- 摘要：Conjugated polymers, with their flexibility, biocompatibility, and excellent electrical properties, demonstrate significant potential in flexible brain-computer interfaces (BCIs), offering prospects for more efficient, stable, and long-term neural signal acquisition and transmission. This review summarizes recent advances in applying conjugated polymers in BCIs, first introducing the use of conductive conjugated polymer electrodes for electrical signal acquisition, highlighting the the unique advantages of organic electrochemical transistor (OECT) devices based on semiconducting conjugated polymers in signal amplification and improving signal-to-noise ratio. In addition, the review explores the potential and current development of hydrogel materials derived from conjugated polymers, summarizing the trends and major challenges in this field. The review indicates that conjugated polymers hold significant potential for advancing BCI multifunctionality and ensuring long-term stable monitoring. We think future research should focus on the development of high-performance conjugated polymer-based hydrogels, device architecture optimization, and system-level integration to further advance flexible BCI technologies.关键词：Conjugated polymers;Brain-computer interfaces;Neural electrodes;Organic electrochemical transistors;Hydrogel427|228|0更新时间：2025-02-27
- 摘要：Fluorescence imaging technology has garnered significant attention in the field of life sciences due to its non-invasive nature, high spatial and temporal resolution, and high sensitivity. As a fundamental tool in fluorescence imaging technology, the development of high-performance fluorescent probes is one of the key approaches to improving imaging quality. With the rapid development of nanomaterial science, fluorescent nanoparticle probes have emerged as formidable contenders in fluorescence imaging, overcoming the deficiencies of traditional organic dyes and fluorescent proteins in terms of fluorescence efficiency and photostability. In recent years, semiconductor polymer nanodots (Pdots) have attracted considerable attention in the field of fluorescent nanoprobes due to their small particle size, high brightness, and great photostability. In this review, we first summarized the development history and preparation strategies of Pdots, and organized the advantages of Pdots as fluorescent nanoprobes in terms of photophysical properties. In addition, this review focuses on the latest applications of Pdots as a class of high-performance fluorescent nanoprobes in fluorescence labeling imaging, super-resolution fluorescence imaging, and in vivo biological imaging. Finally, we analyzed the advantages and limitations of Pdots as fluorescent probes, and explored the main development directions and application prospects of this nanoprobe in the future, which creates new opportunities for broader applications of Pdots in life science imaging.关键词：Semiconductor Polymer;Polymer Nanodots;Fluorescent Probes;Fluorescence Imaging212|253|0更新时间：2025-02-27
Review
- 摘要：High amylose corn starch (HACS) is insoluble in water at room temperature and atmospheric pressure, which limits its applications in biodegradable packaging films. This study employed a tetrabutylammonium hydroxide (TBAH) aqueous solution as a solvent to achieve the dissolution of HACS at room temperature and atmospheric pressure. Subsequently, high-performance HACS films were fabricated through multiple crosslinking of polymer chains, including physical, coordination, and covalent crosslinking. The structure, surface morphology, crystallinity, and mechanical properties of the films were characterized using infrared spectroscopy, atomic force microscopy, X-ray diffraction, and tensile testing. Results demonstrated that compared to HACS films with single physical crosslinking and double crosslinking (physical-coordinated crosslinking and physical-covalent crosslinking), the multiple crosslinked films exhibited lower surface roughness and crystallinity, along with enhanced mechanical properties. The multiple crosslinked films exhibited a tensile strength of 3.18 MPa and an elongation at break of 65%. This study provides a novel approach and strategy for the development of high-performance starch-based film materials.关键词：High amylose corn starch;Tetrabutylammonium hydroxide;Room-temperature dissolution;Multiple crosslinking;Mechanical properties187|149|0更新时间：2025-02-27
- 摘要：With the development of materials genome engineering, research tools that integrate big data and artificial intelligence have become a new paradigm in materials science. However, these tools have shown limited effectiveness in predicting the flame-retardant properties of organic polymers. The main reason is that, unlike the intrinsic properties of organic polymers, which are determined solely by their molecular structure, flame retardancy is not only highly correlated with the material's structure but is also strongly influenced by the complex combustion process. To address this challenge, we propose a database construction strategy specifically designed for flame-retardant material research. Using database management tools and a virtual combustion generator, we extracted data on polymer structures, properties, and combustion processes and developed a web-based flame-retardant polymer database. This database includes not only conventional polymer information such as material names, chemical structures, thermophysical properties, flame-retardant performance, and data sources, but also data on pyrolysis/combustion products generated during real combustion processes. The database provides a unified, searchable, and traceable standard for flame-retardant data, laying the foundation for a data-driven research paradigm in flame-retardant material development and the creation of a high-quality flame-retardant dataset.关键词：Flame-retardant materials;Structural performance;Burning processes;Database;Materials genomics298|230|0更新时间：2025-02-27
- 摘要：Ethylene/tetracyclododecene (E/TCD) copolymers are high-value added cyclic olefin copolymers (COCs). However, the high price of TCD restricts the production and application of E/TCD copolymers with high TCD incorporation. In this study, copolymers with different TCD incorporations and molecular weights were prepared by two selective metallocene catalysts. A series of E/TCD copolymers were prepared with this dual catalyst system by adjusting the ratio of the two catalysts. Apparent TCD incorporation and polymer molecular weight could be effectively controlled and adjusted, thereby achieving satisfactory glass transition temperature and mechanical properties of the obtained COCs. When the ratio of two catalysts was 4:1, the obtained COC exhibited optimal tensile properties, with a tensile strength of 54.6 MPa and an elongation at break of 5.0%. Compared with E/TCD copolymers with high TCD incorporation and high-molecular weight, better tensile properties were achieved. To further improve heat resistance and toughness of the E/TCD copolymer, norbornene bearing soft alkyl tails was introduced as the third monomer to give E/TCD/nC-NB terpolymers by using the dual-catalyst system. The introduction of flexible alkyl side chains could improve the toughness of the polymer, with a 48% increase in elongation at break compared with E/TCD copolymer. By adjusting the composition and structure of the copolymer, the excellent optical properties of the E/TCD copolymer were maintained while reducing the incorporation of the TCD monomer, which realized the optimization of the performance of COC and effectively reduced the cost.关键词：dual-catalyst system;Cyclic olefin copolymer;tetracyclododecene;alkyl norbornene341|69|0更新时间：2025-02-27
- 摘要：As a new catalyst with simple structure, no ligands and low toxicity, bis(trimethylsilyl) amine zinc [Zn(HMDS)2] has been used for ring-opening polymerization of lactide, which is of great scientific significance to expand its application in the biological field. In this work, the ring-opening polymerization of lactide L-LA and D-LA catalyzed by Zn(HMDS)2 was investigated, and the polymerization activity, controllability, crystallization, and the thermal properties of the polymer were discussed. The results showed that the Zn(HMDS)2/BnOH catalytic system could achieve highly efficient and controllable ROP of lactide monomer, and the obtained polymers maintain high stereo-regularity with Pm greater than 0.99. The thermal properties of the polymer were analyzed by differential scanning calorimetry (DSC). It was found that the cold crystallization temperature (Tc), glass transition temperature (Tg) and melting temperature (Tm) changed regularly with the increase of polymerization degree.关键词：Polylactide;Zn(HMDS)2;Ring-opening polymerization237|47|0更新时间：2025-02-27
- 摘要：The polymerization of diphenylphosphinestyrene (StPPh2) and their copolymerization with isoprene (IP) by half- sandwich scandium complexes have been studied. The microstructure and thermal properties of the obtained copolymers were characterized by nuclear magnetic resonance (NMR), gel permeation chromatography (GPC) and differential scanning calorimetry (DSC) analysis. The results showed that the scandium complex (C5H5)Sc(CH2C6H4NMe2-o)2 can serve as an efficient catalyst for the polymerization o-StPPh2 and its copolymerization with IP, however, this scandium complex did not show activity for the polymerization p, m-StPPh2. The position (p,m,o-) of the diphenylphosphino group at the phenyl ring of the styrene unit significantly influenced the polymerization activity. The homopolymerization of o-StPPh2 in toluene at 70 ℃ for 20 min afforded the o-StPPh2 homopolymer possessed a glass transition temperatures (Tg) at 220 ℃ in 96% yield. The copolymerization of o-StPPh2 and IP with different feed ratios in toluene at 70 ℃ for 15 min afforded the o-StPPh2-IP copolymers in more than 92% yield, and the conversion of two monomers were nearly 100%. The composition of o-StPPh2-IP copolymers can be controlled by changing the feed ratio of o-StPPh2 to IP. The analysis of kinetics of copolymerization and structures of o-StPPh2-IP copolymers showed that o-StPPh2 was randomly copolymerized with IP at the initial stage of copolymerization, after all the o-StPPh2 was consumed, and the remaining IP was also polymerized. The obtained o-StPPh2-IP copolymers contained o-StPPh2-IP random sequences and long cis-1,4-polyIP block (the selectivity of cis-1,4 was 94%). The o-StPPh2-IP copolymers with different compositions possessed two Tg. The Tg originating from o-StPPh2-IP random sequences increased from 98 ℃ to 182 ℃ with the increase of o-StPPh2 content in the copolymers, the Tg originating from cis-1,4-polyIP block maintained about -60 ℃.关键词：Diphenylphosphinestyrene;Isoprene;Copolymerization;Scandium197|79|0更新时间：2025-02-27
- 摘要：Hydroxyl-terminated polybutadiene (HTPB), a low-molecular-weight telechelic liquid rubber, is extensively utilized in various applications due to its distinctive attributes, including excellent transparency and low viscosity. The overall properties of HTPB are predominantly influenced by the microstructures of the main chain, with HTPB possessing a high 1,4-content exhibiting superior mechanical characteristics, particularly at low temperatures. However, the synthesis of such HTPB is challenging due to the inferior regioselectivity of current anionic or radical polymerization methods, which predominantly yield products with a high 1,2-content. In this study, we introduce a neodymium-based coordination polymerization system for the preparation of HTPB featuring high 1,4-content. This catalytic system exhibits unique coordinative chain transfer polymerization (CCTP) features, enabling the synthesis of HTPB with controlled molecular weight, narrow polydispersity, and very high 1,4-content. Furthermore, the average functionality ( f ) of the hydroxyl groups in the synthesized HTPB can be readily adjusted by varying the molar ratio of the BdOAl comonomer. The resulting f values can reach up to 3.3, which is significantly higher than those typically obtained from traditional HTPB synthesized via anionic or radical polymerization methods, which are usually below 2.0. In conclusion, the HTPB synthesized using the CCTP method presented in this study offers a complementary advantage over conventional HTPB, showcasing improved control over molecular architecture and functionality, which may have significant implications for the development of advanced materials in various industrial sectors.关键词：Hydroxyl-terminated polybutadiene;High 1;4-content;Rare earth;Coordinative chain transfer polymerization320|101|0更新时间：2025-02-27
- 摘要：A series of triboelectric nanogenerators (TENG) devices were assembled using different degradable polymers as the friction layer and copper sheets as the electrode layer. Under the conditions of the same friction layer thickness and device size, the output performance of the devices was systematically investigated, and the friction electrode property ordering of these degradable polymer materials was obtained. It was found that the TENG with sodium alginate (SA) and polybutylene succinate (PBS) as the friction layer showed the best output performance, with the maximum output voltage reaching 46 V, current 0.7 μA, and the transferred charge 4.68 nC. To further investigate the effect of electrode materials, a TENG device was constructed with SA and PBS as the friction layer and graphene paper (GC-paper) as the electrode, which achieved an output voltage of 88 V, a current of 1.25 μA, and a transferred charge of 14.6 nC. TENG device can be applied in the fields of energy harvesting and self-supplied sensing. This study is of reference value for the development of environmentally friendly TENG devices.关键词：Triboelectric nanogenerator;Degradable polymers;Triboelectric polarity;Self-powered sensor226|61|0更新时间：2025-02-27
- 摘要：The development of high-performance air filtration materials is important for protecting human life and health. In this study, the interaction between poly(L-lactic acid) (PLLA) and poly(D-lactic acid) (PDLA) chains was induced by the electro-induced stereocomplexation strategy, which triggered the generation of hydrogen bonding, promoted the orientation of the C＝O dipole, and induced the formation of stereocomplexed poly(lactic acid) (PLA). Then, silver-doped titanium dioxide (Ag-TIO) nanodielectrics were used to promote molecular interactions to further enhance the stereocomplexation of PLA, and nanofiber membranes with high electroactivity were prepared to achieve high-efficiency and low-resistance air filtration. The results showed that Ag-TIO nanodielectrics and electro-induced stereocomplexation strategy synergistically enhanced the electroactivity, the filtration performance and the mechanical properties of PLA nanofiber membranes: the fibers were significantly refined (from 467 nm to 162 nm), and the surface potentials were dramatically increased (from 0.15 kV to 3.20 kV), which resulted in an excellent filtration efficiency against PM0.3 while maintaining an ultra-low pressure drop (93.3%, 32 Pa, 32 L/min). Moreover, the mechanical properties of the membranes were excellent with tensile strength and elongation at break of 11.9 MPa and 24.0%, respectively, while Young's modulus and fracture toughness were as high as 202.6 MPa and 2.48 MJ/m3, which showed good practical applicability. The proposed biodegradable nanofibrous membranes have a broad application prospect in the efficient filtration of ultrafine particles.关键词：Poly(lactic acid);Biodegradable fibers;Stereocomplexation;Electroactivity;Air filtration144|83|0更新时间：2025-02-27
- 摘要：The hydrogen-bonded polyurethane (PU) elastomers possess excellent self-healing ability and mechanical properties. By introducing multiple bonds into the main chain and side chains of the elastomers, the hierarchical hydrogen-bonding system can further improve the comprehensive performance of the self-healing elast. In this work, the chain extenders N,N-bis(2-hydroxyethyl) oxamide (BHO) and 1-(6-(3-(1,3-dihydroxy-2-methylpropane-2-yl) ureido)hexyl)-3-(6-methyl-4oxo-1,4-dihydropyrimidine-2-yl) urea (UPy-(OH)2) were prepared, and a series of PU elastomers with hierarchical hydrogen bonds (PU-BxUy) were synthesized by using the two chain extenders. The effects of the content of side UPy groups on the properties of the elastomers were investigated by adjusting the ratio of the two chain extenders. The results showed that, compared with PU-B side chain UPy groups, the strength of the PU elastomer with an appropriate amount of side chain UPy groups (PU-B8U2) increased from (22.21±1.67) MPa to (40.62±3.46) MPa, and the toughness was improved from (87.44±4.43) MJ·m-3 to (156.11±5.31) MJ·m-3. In addition, PU-B8U2 can achieve complete scratch healing within 30 min at 100 ℃. Moreover, the healing efficiency of the film can reach 89.4% after 1 h at 100 ℃.关键词：Polyurethane;Elastomer;Hydrogen bond;Microphase separation;Self-healing401|191|0更新时间：2025-02-27
- 摘要：In this paper, the morphologies and phase behavior of spherically confined A0.33B0.33C0.34 star triblock copolymers with a pair of very weak interaction parameters between A and B blocks are studied by using continuous self-consistent field theory. In this study, the bulk phase structure of A0.33B0.33C0.34 star triblock copolymer melts and the influence of the surface property and confinement dimension of the confining nanosphere on the phase structure of the confined copolymers are calculated and analyzed, respectively. The results show that as the confinement dimension of nanospheres increases, the morphologies of hexagonally packed cylinder-forming A0.33B0.33C0.34 star triblock copolymers under spherical confinement with a neutral surface or the surface preference/selectivity for C blocks evolve from various frustrated phase structures to the confined phase structures with a similar structural characteristic to its bulk phase structure. Different from the previous two surface field cases, concentrically spherical layer structures appear in nanospheres of the medium confinement dimension where the nanosphere surface field has a preference for block A or for both A and B blocks. The ability of the segments liked by the surface field to occupy or wet the inner surface of the nanosphere is enhanced with increasing confinement dimension of nanospheres or the changing sequence of the surface field properties from preference for block C to selectivity for block A to preference for both A and B blocks. However, the wetting ability of A0.33B0.33C0.34 star triblock copolymers is weaker than that of linear diblock copolymers under the same confinement environment. Compared with the traditional A0.33B0.33C0.34 star triblock copolymers with symmetric interactions under the same nanosphere confinement, the A0.33B0.33C0.34 star triblock copolymers in this paper show a more complex and interesting phase behavior. This study in this paper has successfully been realized to extend the previous studies on ABC star triblock copolymers limited by symmetric interactions or three pairs of relatively strong interactions to systems with a pair of very weak or approximately zero interaction. Therefore, this work is helpful to fully understand the self-assembly behavior mechanism of star triblock copolymers. It also lays a theoretical foundation for the interpretation of the forming mechanism of complex phase structure.关键词：ABC star triblock copolymers;Spherical confinement;Frustrated phase structure;Surface selectivity;Degree of spatial frustration102|95|0更新时间：2025-02-27
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