Polymers
·
2026
·Vol. 18
·期 12
·1418
·
IF 5.8
Xu Sun,Chen He,Yan Zhang
Epoxy resins are extensively utilized in various fields for their excellent comprehensive performance. However, the inherent brittleness and lack of reprocessing ability greatly limit their sustainability. In order to obtain reprocess ability in epoxy resin with superior mechanical properties and thermal stability, a curing agent (VA) and a hyperbranched epoxy toughening agent (HVT) containing disulfide and imine bonds have been synthesized from vanillin. Owing to the distinctive topological structure and abundant epoxy terminal groups of HVT, the modified epoxy resin (5HVT/E51/VA) exhibits high toughness, enhanced mechanical strength, and favorable thermal stability. When compared to the properties of the unmodified resin, the impact and flexural strength of 5HVT/E51/VA are increased by 55.32% and 71.63%, respectively. Its glass transition temperature (Tg) and 5% weight loss temperature (Td5%) are also enhanced by 4.74% and 11.33%, respectively. Moreover, the resins are highly stable in most solvents, but can be completely degraded in hexylamine/2-mercaptoethanol (HAE/2-ME) solution within 2.5 h. The resin also displays notable scratch-healing capability, and the healing efficiencies reach above 85%. Even after three reprocessing cycles, their strength retention rate exceeds 80%, suggesting excellent sustainability potential. This research provides a sustainable method for preparing high-performance epoxy resins, suggesting their potential applications in self-healing and reprocessable composites.
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DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 100
·56998-57008
·
IF 3.708
Jingfang Li,Xiaopeng Ou,Savannah Sims,Wen Li,Lixin Wu
A quaternary ammonium surfactant (S) carrying a phenol terminal was grafted on the surface of nano-sized polyoxometalates, H4SiW12O40 (PM-1), K6P2W18O62 (PM-2) and Na10[Co4(H2O)2(VW9O34)2] (PM-3), respectively, by ionic self-assembly. The obtained complexes were connected with the poly(vinylpyridine) (P4VP) backbone via hydrogen bonds, resulting in the formation of nano-hybrid supramolecular polymers. Differential scanning calorimetry, polarized light microscopy, temperature-dependent X-ray diffraction, and transmission electron microscopy confirmed that the hybrid polymers containing PM-1 exhibited a thermotropic smectic C phase, where the alkyl chains of the surfactant are equally distributed on either side of PM-1 in a compact manner with only interfacial hydrogen bonding interactions between the phenol groups and the pyridine units of P4VP. Detailed investigation revealed that the liquid crystal properties are dependent on the molar ratio between PM-1 and P4VP, the molecular weight of P4VP and the charges of PMs. An increase of charge from 4 to 6 results in a loss of liquid crystal behaviour. Although the liquid crystal structure of the hybrid polymers is independent of the molecular weight of the P4VP backbone, the transition temperatures are strongly related to the change of the molecular weight of P4VP. The UV-vis and XPS measurements reveal that these hybrid liquid crystal polymers show reversible photochromic properties because of the multi-electronic redox activity of PM-1. The present article opens up a door for developing nano-hybrid liquid crystal polymers via a multi-step supramolecular self-assembly strategy, and provide an insight into understanding the nature and mechanisms of the influence of nano-objects on the self-assembly behaviour of hybrid polymers.
研究领域:
材料科学
·
高分子化学
·
超分子化学
·
纳米材料
·
液晶
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DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2020
·
IF 6.444
Dong An,Xiaoyuan Duan,Shuaishuai Cheng,Zhiyi Zhang,Bo Yang,Qingsong Lian,Jiaxiong Li,Zhijian Sun,Yaqing Liu,Ching-Ping Wong
With the rapid development of electronic integration technology, the timely and efficient heat dissipation capacity has become increasingly important to ensure reliability and lifetime of electronics. Thermal interface materials (TIMs) were considered as the best candidate to tackle this issue. In this work, the three-dimensional structures with covalent bond connections of boron nitride/natural rubber (BN/NR) thermal interface composites were successfully prepared and its possessed an ameliorated through-plane thermal conductivity of 0.79 W m −1 K −1 when BN content were 25 wt%. The results demonstrated that three-dimensional network structures and chemical interactions between BN and NR had a significant contribution in reducing interfacial thermal resistance. Meanwhile, the sensitive thermal response, satisfactory electrical insulation and good mechanical properties made its own high probability for the TIMs applications. Importantly, this tactics created a new means to construct elastomer-based thermal management materials and applied for the electronic packing materials.
研究领域:
材料科学
·
热管理技术
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产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Panpan Song,Liuping Du,Jiuyin Pang,Guiquan Jiang,Jianmin Shen,Yanli Ma,Shixue Ren,Shujun Li
Conventional epoxy asphalt is a thermosetting material that is difficult to reprocess and cannot be easily recycled after disposal. In this study, a lignin-based epoxy asphalt (ELEA) with thermoplastic and thermosetting properties was prepared by introducing a lignin-based vitrimer system, which has a dynamic, covalently bonded, cross-linked ester network, into the asphalt. The mechanical properties (tensile strength, 1.605 MPa; elongation at break, 382.38 %) also meet the requirements of epoxy asphalt for steel bridge deck pavement. The viscosity, thermal properties and high-temperature reversibility of ELEA show that ELEA has good operability, thermal stability and potential for recycling, in line with the trend towards the development of a circular economy. The use of biomass-based derivatives for the epoxy resin and curing agent in ELEA also reduces dependence on non-renewable petroleum resources and provides a useful reference for the high-value and efficient development and utilization of industrial lignin.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
ACS Applied Polymer Materials
·
2026
·
IF 5.2
Yunjian Wu,Xuefeng Ye,Chengjie Li,Chao Gao,Qiulin Chen,Haoqin Chen,Chen Peng,Shuangshuang Tian,Xiaoxing Zhang
Traditional epoxy insulation materials are prone to irreparable damage during long-term operation, severely limiting the reliability and lifespan of electrical equipment. Their difficult degradability and recyclability pose significant environmental pressures. This study proposes a strategy based on a “rigid–flexible integrated” molecular design. By introducing hindered urea bonds and imine bonds, we successfully construct a dual-dynamic covalent bond epoxy resin network (HXVY-EP) with adjustable proportions, which not only addresses the self-repair and degradation issues of traditional epoxy resins but also compensates for the defect of network imbalance caused by dynamic bonds. Precise control of material properties can be achieved by adjusting the proportion of dynamic bonds. For example, H20V20-EP exhibits excellent thermodynamic performance with tensile strength up to 95.2 MPa and the initial decomposition temperature above 250 °C. H25V25-EP shows a power frequency dielectric loss as low as 0.00599 and breakdown strength up to 40.36 kV/mm, which can be used in the area of high-end electrical equipment with low loss and high voltage resistance. Importantly, the material can achieve self-repair of mechanical damage within 10 min at 110 °C. Moreover, the material can be efficiently degraded at room temperature using various solvents, providing a feasible, environmentally friendly recycling pathway for epoxy. This work has achieved the coordinated optimization of the dynamicity, stability, and functionality of epoxy resin, and has broad application prospects in the fields of power equipment, aerospace, and sustainable electronic packaging.
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DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2024
·
IF 6.3
Tengfei Han,Benzhi Ju,Shufen Zhang
Despite covalent adaptable networks (CANs) imparting the reprocessing performance of crosslinked polymers, due to reversible bond exchange of the dynamic covalent bonds ; it is still a huge challenge to design catalyst-free, fast reprocessing, controlled degradation and raw material recycling biomass base CANs. Here, for the first time, we prepared cellulose CANs base on hemiacetal and acetal bonds (ACCs) via aldehyde and hydroxyl reaction of the dialdehyde crosslinker with hydroxypropyl cellulose (HPC). By regulating the crosslink density and chemical structure of the crosslinked network, ACCs exhibit tunable thermal and mechanical properties. The crosslinked network structure of the ACCs benefits from the rapid bond exchange of the hemiacetal and acetal bonds at elevated temperatures, which allows for rapid stress relaxation and thus, superior reprocessing properties. In addition, it was found that the dynamic exchange of acetals in the ACCs is influenced by the chain length and flexibility of the crosslinker. Moreover, ACCs possess good degradation and cellulose feedstock recycling properties due to the acid sensitivity of the acetal bonds. This work provides an effective solution to the problems of resource waste caused by petroleum-based thermoset plastics.
研究领域:
材料科学
·
化学工程
·
生物化学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xiaorui Wang,Hao Li,Wenhui Fu,Qiushi Chen,Xuzhong Gong,Zhi Wang,Junhao Liu
Binders provide a straightforward and efficient strategy to mitigate the significant challenge of volume expansion in silicon anodes for lithium-ion batteries. To improve the cycle life of silicon anodes, a cross-linked binder carboxymethyl cellulose–phytic acid–pyrrole (CMC-DP) is designed and synthesized using carboxymethyl cellulose, phytic acid, and pyrrole. The numerous hydroxyl groups in phytic acid provide abundant binding sites for the formation of hydrogen and ester bonds. The formation of hydrogen bonds and covalent bonds enhances the mechanical properties of the adhesive. The amino groups in the binder form N Si O covalent bonds with silicon particles, while the hydroxyl and carboxyl groups form (COO) 2 Cu and (OH) 2 Cu coordination bonds with the copper foil, enhancing interfacial adhesion. When the CMC-DP10 (10 µL pyrrole) binder is applied to silicon nanoparticles (∼30 nm), the specific capacity of the electrode can be maintained at around 1700 mAh/g after 500, whereas the CMC binder achieves only ∼100 mAh/g under the same conditions. This work demonstrates that the CMC-DP binder exhibits strong adhesion to both silicon nanoparticles and copper foil.
研究领域:
材料科学
·
电化学
·
能源存储
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产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Fengjiao Zhang,Sufeng Zhang,Rui Lin,Shuyuan Cui,Xiaokai Jing,Sergiu Coseri
Therapeutic drugs for human cardiovascular disease require specific carriers. Hydrogels have a porous structure, plasticity, and biocompatibility, and are ideal carriers for cardiovascular drugs. Moreover, for their intended functions, hydrogels also need to have high mechanical properties, self-healing properties, good pH-responsive performance, and other properties. Here, based on the interactions between multiple dynamic covalent bonds, we effectively synthesized hybrid hydrogels of carboxymethyl chitosan (C-CS), aldehyde-modified hyaluronic acid (OHA), polyvinyl alcohol (PVA), and boric acid (BA). The multiple covalent bonds reinforce each other, endowing the hydrogels with high mechanical properties, self-healing properties and pH responsiveness. In addition, the whole preparation process does not require crosslinking agents and the operation process is simple. The results show that the 5% PVA + C-CS + OHA + BA hydrogel has high mechanical properties (tensile stress 40.07 KPa; compressive stress 553.38 KPa), good self-healing performance (up to 92%) and excellent pH responsive performance. In addition, the hydrogel has high drug-loading capacity (117.54 mg/g) and sustained-release performance. In conclusion, this hybrid hydrogel can potentially be used as a drug carrier for clinical treatment.
研究领域:
生物材料学
·
药剂学
·
医学工程
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DOI
高影响因子
Solar RRL
·
2026
·Vol. 10
·期 18
·e70488
·
IF 4.8
Jinze Li,Jiahao Gan,Ming Sheng,Mengyang Xu,Yining Zhang,Xiang Liu,Pengwei Huo
The accumulation of antibiotic pollutants in aquatic environments poses threats to ecosystems. Photocatalysis is a promising approach for removing these pollutants, but conventional powder photocatalysts often suffer from difficult recovery and poor stability. Therefore, developing efficient, stable, and easily recoverable catalytic materials is important. In this study, 2D g-C 3 N 4 and MoS 2 were immobilized in a polyvinylidene fluoride (PVDF) membrane to prepare a g-C 3 N 4 /MoS 2 /PVDF piezo-photocatalytic composite membrane. Under the combined action of visible light and mechanical vibration, the membrane achieved a TC degradation efficiency of 76.54%, indicating a synergistic enhancement between piezoelectric polarization and photocatalysis. The formation of C─S bonds at the g-C 3 N 4 /MoS 2 interface enhanced electronic coupling between the two phases, promoting directional migration and spatial separation of photogenerated carriers. Meanwhile, the piezoelectric built-in electric field generated by PVDF under ultrasonic excitation further suppressed carrier recombination and accelerated interfacial charge transfer. Overall, the g-C 3 N 4 /MoS 2 /PVDF membrane shows good visible-light response, piezoelectric-assisted charge separation, mass transfer, recyclability, and stability, offering a new approach for antibiotic wastewater treatment and related membrane material design.
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Jiaofeng Ye,Junxiang Zhang,Libang Feng,Haocheng Liu,Danbin Zhu,Yanhua Liu
The development of self-healing materials has enabled the production of more reliable and intelligent materials. However, resolving the conflict between mechanical strength and self-healing efficiency as well as limited repair options of the self-healing materials is still the most pressing scientific challenge. In this study, a self-healing polyurethane with multiple repair methods is prepared by introducing disulfide bonds into thermo-reversible imine bonds-based polyurethane . The resultant polyurethane exhibits impressive comprehensive mechanical properties and preeminent repair capabilities. More importantly, damages can be repaired through various routes such as room temperature, moderate temperature, hair dryer blowing, and ethylenediamine assistance treatments. The superior mechanical properties, repetitive self-healing performance, and multiple options for repair is attributed to the cooperation of thermally reversible imine and disulfide exchanges, thermal motion of molecular chains , and dissociation/regeneration of hydrogen bonds . So this research provides numerous ideal options for repairing cracks and other damages in materials used in construction industry under different usage environments. Consequently, high-quality repairs, improved efficiency, and extended service life of construction engineering materials can be ensured.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2024
·
IF 4.8
Lingyuan Liao,Wenhong Ruan,Mingqiu Zhang,Weihao Li,Musong Lin
Incorporation of boron nitride (BN) into polymers is a promising method to obtain composites with high thermal conductivity, low dielectric constant ( D k ), and dielectric loss ( D f ), while the practical applications are limited by the poor interface between BN and polymer because of surface energy mismatch and absence of covalent bond connection between them. Herein, polydopamine (PDA) with good adhesion is deposited onto the BN. Then, a different amount of silane coupling agent containing vinyl reactive groups is grafted onto PDA-coated BN. In this way, the surface energy of modified BN (m-BN) can be adjusted to ensure BN contacts well with polymers. Moreover, reactive groups were introduced on BN for further reaction. Subsequently, covalent bonds between the m-BN and the polyphenylene oxide (PPO) were established in situ during the curing process. The effects of the m-BN surface energy on interface quality and thermal conductivity of composites are investigated. The m-BN/PPO composite achieves a through-plane thermal conductivity of 5.87 W/m · K and a low D f value of 1.53 × 10 −3 , as well as a low coefficient of thermal expansion (CTE) value (7.8 ppm/K) when the m-BN loading is 32.6 vol%. This research provides a simple and efficient strategy for fabricating high-performance composites for high-frequency applications. Highlights Hexagonal boron nitride was modified successfully by combining non-covalent and covalent modifications. Regulating surface energy and establishing covalent bonds enhances interface interaction between BN and polyphenylene oxide. Modified BN/polyphenylene oxide composites display improvements in thermal conductivity and dimensional stability as well as dielectric loss. Provides a feasible strategy for designing polymer composites with high thermal conductivity, dimensional stability, and low dielectric loss for 5G applications.
研究领域:
材料科学
·
高分子化学
·
电子材料
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产品关联
DOI
高影响因子
BIOMACROMOLECULES
·
2020
·
IF 6.092
Yanxia Wang,Yiting Fan,Minghao Zhang,Wen Zhou,Zhihua Chai,Hao Wang,Chunfeng Sun,Fan Huang
An intelligent carrier system is based on fast glucose response mechanism to regulate the insulin release. Here, glucose dual-responsive nanoparticles were quickly and efficiently obtained, by dynamic covalent bonds between phenylboronic acid-containing homopolymer poly(3-acrylamidophenylboronic acid) (PAAPBA) and glycopolypeptide poly(ethylene glycol)-b-poly(aspartic acid-co-aspart-glucosamine) (PEG-b-P(Asp-co-AGA)) through the formation of cycloborates. Meanwhile, insulin and glucose oxidase (GOx) were loaded during the formation of nanoparticles. The cycloborates in the nanoparticles could be destroyed by the replacement of glycosyl moieties by glucose and oxidized by H2O2 generated from the glucose–GOx system, resulting in the rapid insulin release. After subcutaneous delivery of the insulin/GOx-loaded nanoparticles to diabetic mice, a significant hypoglycemic effect was observed over time. Cytotoxicity study, hemolysis assay, and histological analyses suggested that the nanoparticles showed excellent biocompatibility and safety. This work lays the important theoretical and technical foundations for expanding the scope of applications of nanocarriers in diabetes treatment.
研究领域:
生物材料学
·
糖尿病治疗
·
药剂学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）