IRANIAN POLYMER JOURNAL
·
2025
·
IF 2.8
Yang Yi,Sun Yawen,Yang Xin,Zhang Chenchen,Gao Huajie,Zhang Haorong,Wang Jianfeng,Yang Yanyu,Wang Wanjie,Cao Yanxia
This study investigates the shape memory and reconfigurability behaviors of recycled polyvinyl butyral (RPVB) with partially extracted plasticizer, which is crosslinked using hexamethylene diisocyanate (HDI) and a catalyst, dibutyltin dilaurate (DBTDL). The use of RPVB, a recycled plastic, is significant as it contributes to sustainability by reducing waste and promoting the reuse of plastic materials. The effect of HDI content on the shape memory performance of RPVB was explored, with emphasis on the catalyst's role in enhancing its reconfigurability. RPVB-20, with 20% plasticizer extraction, exhibits excellent shape fixation at room temperature, with a shape recovery rate (R r ) of 81.2%, which increases to over 95% after HDI crosslinking. The addition of DBTDL further improves the material's reconfigurability, enabling it to adopt new permanent shapes through dynamic covalent bond exchange at 160 °C. The material demonstrates good shape memory performance with an R f of 99.4% and an R r of 96.9% when 0.2 phr HDI is added. Stress relaxation and creep tests show that the catalyst accelerates urethane exchange, providing plasticity at elevated temperatures. Furthermore, RPVB-20-0.2-DL exhibits excellent reprocessing properties, with stable mechanical properties after reprocessing, making it suitable for manufacturing permanent three-dimensional shapes and for potential recycling applications. The results suggest that dynamic covalent bonds in RPVB shape memory polymers offer both high reconfigurability and stable mechanical properties, providing a promising approach for sustainable material design in smart applications while promoting the recycling and reusing of plastic materials in line with environmental objectives. Graphical
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 34
·e54304
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IF 3
Feixue Sun,Qi Yao,Yiting Wang,Jiemin Lou,Qiang Li,Qian Tao,Guiying Li
Hydrogels based on dynamic covalent bonds have unique properties and are competent in many biomedical fields. However, critical issues such as biocompatibility, mechanical properties, and stimulus responsiveness are required to be solved. It is also expected to develop a simple preparation method with mild conditions. Based on these objectives, chitosan (CS), sodium alginate (SA) and 2-formylphenylboronic acid (2-FPBA) are used to prepare the dynamic covalent bond hydrogels within minutes neither chemical medications nor severe conditions. Benefiting from the imine borate and boronic ester bonds both formed in the hydrogels, the hydrogels are stable, injectable, and of efficient self-healing properties. The damage-recovery process can be repeated for more than 6 cycles. The microstructure of the hydrogels recoded by atomic force microscopy (AFM) is consistent with the mechanical properties and both of them could be affected by the concentrations of SA and 2-FPBA. Moreover, the dynamic hydrogels are responsive to pH values and oxidative environment. When the model drug 5-fluorouracil (5-FU) is loaded in the dynamic hydrogels, the release profiles are sustainable and present significant differences with various stimuli. These dynamic covalent bond hydrogels have a promising prospect in tissue engineering and drug delivery.
研究领域:
材料科学
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生物医学工程
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药学
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高影响因子
CATALYSIS LETTERS
·
2026
·Vol. 156
·期 4
·109
·
IF 2.5
Niu Suran,Xiang Yuzhi,Zhang Yansheng,Xia Daohong,Zhang Wenliang
To prevent the aggregation of phthalocyanine in catalytic reactions, and improve its catalytic efficiency, this is an effective way by loading metal phthalocyanine onto graphene oxide (GO) with special physico-chemical properties. nitro mono/binuclear metal phthalocyanine was synthesized using different metals (cobalt, copper, iron) with 4-nitrophthalonitrile and 1,2,4,5-tetracyanobenzene as raw materials by the 1,8-diazabicyclo(5,4,0)undecane-7-ene (DBU) liquid phase catalytic method. The binuclear cobalt phthalocyanine with the best catalytic effect was loaded onto GO by means of silane coupling agent. Highly active composite catalysts based on nitro mono/binuclear cobalt phthalocyanine covalently supported on GO were prepared. Specimens were characterized by Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) to assess their catalytic performance. The results showed that the covalent linkage between GO and metal phthalocyanine enhances the catalytic activity of such composite catalysts, and GO plays an important role therein. The research also shows that the catalytic performance of GO-binuclear cobalt phthalocyanine (GO-Bi-CoPc) is optimum and the preparation process of composite catalysts is repeatable. Graphical
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高影响因子
Nanomaterials and Nanotechnology
·
2015
·
IF 0.857
Xianbin Liu,Na Wen,Xiaoli Wang,Yuying Zheng
To maximize the utilization of its single-atom thin nature, a facile scheme to fabricate graphene multilayer films via a layer-by-layer self-assembled process was presented. The structure of multilayer films was constructed by covalently bonding graphene oxide (GO) using p-phenylenediamine (PPD) as a covalent cross-linking agent. The assembly process was confirmed to be repeatable and the structure was stable. With the π-π conjugated structure and a large number of spaces in the framework, the graphene multilayer films exhibited excellent electrochemical performance. The uniform ultrathin electrode exhibited a capacitance of 41.71 μF/cm2 at a discharge current of 0.1 μA/cm2, and displayed excellent stability of 88.9 % after 1000 charge-discharge cycles.
研究领域:
材料科学
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电化学
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高影响因子
Nano Research
·
2017
·Vol. 11
·期 1
·410-419
·
IF 7.354
Pan Xiao-Feng,Gao Huai-Ling,Su Yang,Wu Ya-Dong,Wang Xiang-Ying,Xue Jing-Zhe,He Tao,Lu Yang,Liu Jian-Wei,Yu Shu-Hong
High-performance composites containing various kinds of nanofibers as reinforcing building blocks have recently received considerable attention, owing to their superior mechanical properties. One of the effective strategies to reinforce these composites involves strengthening interfacial interactions via covalent bonds. However, in contrast to nanosheets, covalent bonds have been rarely used in nanofiber-reinforced composites. Herein, we report the macroscale fabrication of a series of Ag nanowire (NW)-thiolated chitosan (TCS) composite films via spray induced self-assembly. The obtained films were significantly strengthened by Ag–S covalent bonds formed between the Ag NWs and the thiol groups of TCS. The tensile strength of the optimized Ag NW-TCS film was up to 3.9 and 1.5 times higher compared with that of pure TCS and Ag NW-chitosan (CS) films, respectively.
研究领域:
材料科学
·
纳米技术
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 59
·88882-88893
·
IF 5.19
Wang Yinghui,Chen Yuantao,Zhao Meng,Zhang Lili,Zhou Changyou,Wang Haiyang
Radioactive iodine in nuclear waste is increasingly harmful to the human body and the environment because of its strong radioactivity, high fluidity, easy solubility in water, and long half-life. It is very important to find clean and economical materials to recover and fix radioactive iodine. In this paper, the amino-metal-organic framework was covalently modified to obtain composite materials to improve the recycling of iodine in the environment. These adsorbents are used to adsorb iodine in water, showing outstanding adsorption performance. The adsorption data are in good agreement with the Langmuir isothermal adsorption model and pseudo-second-order kinetic model, indicating that the adsorption process is mainly monolayer adsorption and chemical adsorption. The two materials showed selective adsorption capacity for iodine in the solution containing multiple competing ions. The adsorption capacity of the covalently modified composite increased from 949.52 to 2157.44 mg/g. Compared with the amino-metal-organic framework, the modified composite contains more electron-rich groups as active sites, and forms charge transfer compounds with iodine to realize chemical adsorption. Through the simulated adsorption of ultra-high-pressure micro-jet, the material has certain working ability under high pressure, which provides a theoretical basis for the future recovery and utilization of iodine under high pressure. Graphical abstract
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Extreme Mechanics Letters
·
2025
·
IF 4.5
Dichao Ning,Zihan Zhang,Chenyu Jin,Qian Shi
Rubber is widely applied due to its high elasticity and durability, but traditional crosslinked networks are non-recyclable. The incorporation of dynamic covalent bonds endows vitrimers with recyclability and self-healing ability. However, the regulatory effect of curing kinetics and chemical ratio on dynamic covalent bonds has not been systematically studied, and such regulation is crucial for designing high-performance rubber vitrimers. In this work, rubber vitrimers with hybrid network were synthesized by using epoxy monomers and curing agent containing disulfide bonds. By varying the chemical ratio of soft segments (PEG) and hard segments (BPDG or DGEBA), and tuning curing time, we characterized their dynamic performance, tensile properties and fracture toughness. Furthermore, kinetic equation was incorporated into and used to extend the Lake–Thomas model, enabling quantitative description and prediction of fracture energy. The results demonstrate that increased curing degree and disulfide bond proportion enhance the fracture toughness and fracture strain of the rubber polymer, but slightly reduce its strength and modulus. Moreover, the introduction of dynamic covalent bonds favors both fracture toughness and dynamic performance. This work provides theoretical guidance and processing strategies for the design of high-performance rubbers.
研究领域:
材料科学
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高分子化学
·
材料力学性能
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Chao Wang,Wenbin Liu,Rongrong Chen,Gaohui Sun,Jing Yu,Qi Liu,Jingyuan Liu,Ying Li,Jiahui Zhu,Peili Liu,Jun Wang
Macrophages can kill bacteria and viruses by releasing free radicals, which provides a possible approach to construct antifouling coatings with dynamic surfaces that release free radicals if the breaking of dynamic covalent bonds is precisely regulated. Herein, inspired by the defensive behavior of macrophages of releasing free radicals to kill bacteria and viruses, a marine antifouling coating composed of polyurethane incorporating dimethylglyoxime (PU x -DMG) is prepared by precise regulation of dynamic oxime-urethane covalent bonds. The obtained alkyl radical (R·) derived from the cleavage of the oxime-urethane bonds manages to effectively suppress the attachment of marine biofouling. Moreover, the intrinsic dynamic surface makes it difficult for biofouling to adhere and ultimately achieves sustainable antifouling property. Notably, the PU 50 -DMG coating not only presents efficient antibacterial and antialgae properties, but also prevents macroorganisms from settling in the sea for up to 4 months. This provides a pioneer broad-spectrum strategy to explore the marine antifouling coatings.
研究领域:
材料科学
·
生物学
·
海洋科学
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高影响因子
Journal of Cleaner Production
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2025
·
IF 10
Min Fan,Yuanmeng Wang,Jingbo Zhao
In the pursuit of green, environmental protection, and sustainability, the development of bio-based polyhydroxyurethanes (PHUs) to replace traditional petroleum-based polyurethanes has attracted widespread attention. In this study, new bio-based vanillin-PHU vitrimers (C-PHUs) with hydroxyurethane and imine dual dynamic bonds were synthesized. A new vanillin cyclic carbonate with an aldehyde group (V-C) was prepared from the cyclocarbonation of a vanillin-diol with dimethyl carbonate under normal pressure, and the C-PHUs were prepared from the aminolysis reaction of V-C with two triamines. The maximum tensile strength and elongation at break of the C-PHUs reach 79 MPa and 296 %, respectively, which are at the leading level among present PHUs. Aromatic structure makes the C-PHUs show excellent mechanical properties and relatively high T g . Hydroxyurethane and imine dual dynamic bonds result in good reprocessability and self-healing properties as well as low activation energy of 81.81–101.78 kJ/mol. At the same time, imine bonds enable C-PHUs to degrade at room temperature under acidic conditions, providing an efficient way for the post-waste treatment. Bio-based C-PHUs with excellent mechanical properties, reprocessability, and degradability were prepared successfully.
研究领域:
材料科学
·
绿色化学
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Yabing Tian,Songlin Dai,Jing Wang,Xujuan Huang,Haibo Zhang,Yuxiang Chen
The application of epoxy foams is limited by their non-biobased raw materials and challenging degradation. To address these issues, this study prepared catalyst-free, self-healing, and degradable tung oil-based foams (VF-X) based on dynamic ester exchange. These foams were developed using the latent foaming-curing agent isophorone diamine carbamate (IPDAC), along with triglycidyl ester of eleostearic acid maleic anhydride adduct (TEMA) and isophorone diamine (IPDA) as raw materials. The resulting foams demonstrated favorable mechanical properties (compressive strength of 3.55 MPa) and notable thermal stability. With dynamic hydroxyl ester bonds and self-catalytic tertiary amine groups, these foams exhibited outstanding self-healing performance (withstand a weight of 500 g), rapid stress relaxation, excellent degradability in ethanolamine, and triple-shape memory properties without requiring additional catalysts. Leveraging these features, a visually programmable shape-color dual-response smart foam (VF-TC) was developed using thermochromic microcapsules (TCM) doped in tung oil-based foams. These high-performance multifunctional foams can be easily prepared, offering promising prospects for smart applications in precise local shape and color modulation, environmental sensing, and high‑temperature warning systems.
研究领域:
材料科学
·
化学工程
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高影响因子
Soft Matter
·
2016
·Vol. 12
·期 48
·9683-9691
·
IF 3.798
Huazhang Guo,Duanguang Yang,Mei Yang,Yong Gao,Yijiang Liu,Huaming Li
In this study, pH- and glucose-responsive Pickering emulsions stabilized by core crosslinked polymer nanoparticles, which were constructed via reversible covalent bonds, were presented for the first time. Firstly, well-defined PDMA-b-PAPBA (poly(N,N-dimethylacrylamide)-b-poly(3-acrylamidophenylboronic acid)) diblock copolymers were synthesized via sequential reversible addition–fragmentation chain transfer (RAFT) polymerization reactions. By means of complexation of PBA units of PDMA-b-PAPBA with PVA in basic water, core crosslinked polymer nanoparticles (CCPNs) with a core–shell structure were formed. The PAPBA/PVA crosslinked network and PDMA acted as the core and shell, respectively. Because of the reversible B–O chemical bonds in the core, the as-produced CCPNs showed structural transitions in response to the external stimuli involving pH and glucose. Investigation of the interfacial activities revealed that CCPNs exhibited high emulsifying performances, and oil in water (o/w) Pickering emulsions could be formed at a low particle content. The formed Pickering emulsions showed high stability at room temperature without any disturbances, whereas de-emulsification was observed upon improving the pH or adding glucose at a given pH. This is the first report on a responsive Pickering emulsion whose stability can be manipulated by glucose, and this type of fabricated manipulative Pickering emulsions are expected to provide useful guidance in the fields of oil recovery, interfacial reactions, etc.
研究领域:
材料科学
·
化学工程
·
界面科学
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PubMed
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Shixing Chao,Danqin Li,Weiqiang Zhou,Yanmei Liang,Yao He,Jingkun Xu,Peipei Liu
Benzothiazole (Bz) molecules with excellent electrochemical stability and activity are favor of enhancing the capacitance performance of N-doped graphene (NG) by non-covalent functionalization. Herein, Bz molecules with different substituent groups (-ketone, -methoxy, -ketone and-methoxy) are used to functionalize NG nanosheets by a hydrothermal method and freeze-drying procedure. The surface chemistry and structure of as-prepared functionalized NG nanosheets are investigated through UV − vis, FTIR, SEM, AFM, XPS, TGA, XRD, Raman and BET. The electrochemical results of four functionalized NG nanosheets show that the substituent groups on Bz molecules have a great influence on their capacitive properties, among which the NG modified by the 6-methoxy benzothiazol-2-ketone (1-MhzNG) demonstrates the highest specific capacitance (420 F g −1 at 1 A g −1 ) and excellent cycle stability of 95.7 % after 10,000 cycles. In addition, the assembled supercapacitor based on the 1-MhzNG electrode delivers the highest energy density of 22.5 Wh kg −1 at 809 W kg −1 . Our work provides a new idea to modify graphene with novel organic small molecules for high-performance SCs.
研究领域:
材料科学
·
电化学
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高影响因子
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