CHINESE JOURNAL OF POLYMER SCIENCE
·
2024
·Vol. 42
·期 10
·1495-1504
·
IF 4.1
Wu Shi-Long,Yang Huan-Huan,Chen Quan
In this study, we synthesized a series of ABA-type vitrimers by crosslinking the short A moieties of precursors with a bifunctional crosslinker and evaporating the small molecular byproduct. The vitrimer samples thus prepared exhibit linear viscoelasticity dependent on the length of A moiety as well as the content of the crosslinks. When the average number of A monomers per end moiety m =1.1, the crosslinker can only extend the chain but not crosslink the chain. When m becomes 2.8 or higher, introducing a crosslinker first leads to the gelation, whereas excess in crosslinker molecules leads opening of the crosslinking sites and accordingly reentry into the sol regime. Surprisingly, a further increase in the length of the A moieties increases the relaxation time much weaker than the exponential increase seen for the physically crosslinked ABA-type ionomers. We attribute this difference to the distinct relaxation mechanisms: the relaxation of the vitrimer samples is based on relatively independent exchange reactions, which contrasts with the ABA-type ionomers that relax through the collective hopping of connected ionic groups from one ion aggregate to another.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Matter
·
2021
·
IF 15.589
Yang Yang,Huimin Wang,Shuai Zhang,Yen Wei,Xiangming He,Jianlong Wang,Yingying Zhang,Yan Ji
Soft actuators are highly desirable in soft robots, electronic devices, wearable devices, etc. Both multi-stimuli responsiveness and multichannel self-healing ability are essential for soft actuators to be used in different circumstances. However, to date, research on soft actuators with multi-stimuli response or multichannel self-healing ability is scarce, and there is none on actuators with both multi-stimuli abilities. Here, we show that simply hot-pressing carbonized silk fabrics into the surface of vitrimers results in a thermosetting soft actuator that can be efficiently and repeatedly self-healed by five stimuli (light, electricity, electromagnetic wave, solvent, and heat) and can respond to four stimuli (light, electricity, heat, and solvent) simultaneously. Moreover, due to the nature of vitrimer, it is robust, sustainable, recyclable, and reprocessable. This soft actuator may greatly broaden its applications, as it is hopefully healed and actuated by a handy and facile tool when it is used in different environmental circumstances.
研究领域:
材料科学
·
软体机器人
·
智能材料
·
自修复材料
·
高分子科学
✓ 已验证
DOI
高影响因子
POLYMER
·
2023
·
IF 4.6
Mei-Juan Xie,Chang-Cheng Wang,Rong Zhang,Jian Cao,Mao-Zhu Tang,Yun-Xiang Xu
Inhomogeneous network construction is a useful strategy to solve the trade-off between mechanical strength and creep in vitrimer rubbers. But it is still lack of tools to tune the mechanical properties and network dynamics of this new system. In this paper, uneven distribution of functional groups was realized by sequential coordination polymerization of myrcene and isoprene and epoxidation . The following epoxidation and curing generated VMI-x samples with inhomogeneous network. Polyisoprene was used to prepare control samples called VPI-x with homogeneous network. Different lengths of dicarboxylic acid crosslinkers (SA = succinic acid, HA = heptanedioic acid, DA = decanedioic acid) were used to probe their effects on dynamic behaviors, mechanical properties and recyclability . Morphological test and nanomechanical mapping confirmed the inhomogeneous feature of VMI-x samples. For both inhomogeneous and homogeneous samples, SA and DA crosslinkers brought higher tensile strength and modulus, earlier SIC phenomenon and higher orientation percentage of amorphous molecular chains than those of HA, which are ascribed to extra permanent cross-linking existing in SA samples and transition entanglements existing in DA samples. However, the constrain effect of SA crosslinker is too strong in inhomogeneous network to sacrifice the extensibility, which is much smaller than those of HA and DA. SA and DA samples also present restricted segmental motion and superior creep resistant properties compared to HA samples according to the results of broadband dielectric spectroscopy and DMA test. Differently, at high temperature above 130 °C, the stress relaxation, topology freezing transition temperature (Tv) and recycling efficiency of strength are dominated by the crosslinker length monotonically, probably due to the disentanglement of DA crosslinkers. Compared to homogeneous network, inhomogeneous ones showed obvious enhanced mechanical properties, lower hysteresis, quicker segmental relaxation, lower creep and quicker network relaxation. This work demonstrates that crosslinker lengths could tune the vast aspects of vitrimer elastomers and is a non-negligible factor to determine their properties, especially for those with inhomogeneous networks.
研究领域:
高分子科学
·
材料工程
·
软物质物理
·
化学合成
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Yangyang Zhu,Fei Gao,Jiang Zhong,Liang Shen,Yangju Lin
The utilization of bio-based precursors to prepare materials is highly desirable for the consideration of sustainable energy and materials. Vitrimers have received considerable attention because of their high mechanical performance that is comparable to conventional thermosets and advantageous reprocessability that allows to be recycled. However, most vitrimers are prepared from petroleum-based raw materials, and only a few examples employ bio-based raw materials, of which most utilize transesterification dynamic chemistry that often requires external catalyst that may leach or decompose during reprocessing. Herein, we report a catalyst-free vinylogous urethane vitrimer derived from renewable castor oil and DL-limonene. Prepared vitrimer shows excellent reprocessability and shape memory properties. We also envisaged that the strategy of preparing bio-based vitrimers reported here can be generalized to other bio-based raw materials that are rich in double bonds.
研究领域:
材料科学
·
可持续化学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2026
·
IF 3.9
Xiaoxi Huang,Yuan Sang,Hailing Liu,Yifeng Sun
Mechanochemistry is an efficient, solvent-reduced, and extra heat-free green chemistry method. In this work, mechanochemistry is applied to the polymerization of PLA. The resulting PLA was esterified with citric acid to obtain a vitrimer-like polymer, which was also carried out via mechanochemistry. These mechanochemistry processes were performed using a planetary ball mill, which is favorable for scale-up synthesis. The synthesized polymer was characterized by NMR and SEC, and the vitrimer-like properties were evaluated by rheology, DSC, TGA, and shape memory behavior. Graphical Using mechanochemistry, PLA is polymerized via an efficient, solvent-reduced, heat-free route. The as-synthesized PLA is then further converted into a vitrimer-like polymer by mechanochemical modification. The resulting material exhibits dynamic network behavior, as confirmed by thermal, rheological, and shape-memory analyses.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Lei Wang,Mushan Yuan,Yisen Huang,Yang Chen,Shengtai Zhou,Huawei Zou,Yinfu Luo,Zhengguang Heng,Mei Liang
Introducing dynamic covalent bonds offers a promising strategy to enable the reprocessing and repair of epoxy resins and their composites, with efficacy tied to the type and extent of dynamic exchange. Although combining multiple mechanisms has received increasing attention, in most studies, these multiple mechanisms are independent of each other, lacking more efficient synergistic effects, and often exhibit worse mechanical performance along with elevated reprocessing temperatures. To overcome these challenges, we developed an epoxy vitrimer and its composites incorporating synergistic dual dynamic exchange mechanisms. This was achieved by combining an imine-containing epoxy resin with a curing agent featuring vinylogous urethane (VU) dynamic bonds, which is designed with excess amine groups to undergo dynamic exchange with both mechanisms. The resulting samples exhibit outstanding mechanical properties, including a tensile strength of 100.32 MPa, a glass transition temperature (T g ) of 125.07 °C, and an elongation of 6.77 %. Reprocessing near T g allows tensile strength and elongation at break to recover to 75.54 % and 52.14 % of their original values, respectively, after two cycles. These epoxy vitrimers and composites optimally balance high mechanical strength and structural reversibility through dual dynamic exchange mechanisms. Additionally, this design enables rapid, non-destructive carbon fiber recovery at room temperature and effective shear repair of carbon fiber layers, offering insights for designing longer-lasting epoxy materials and repair strategies.
研究领域:
材料科学
·
高分子化学
·
复合材料
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Lei Chen,Zekun Li,Yufeng Ma,Qianqian Shang,Yun Hu,Qin Huang,Meng Zhang,Puyou Jia,Yonghong Zhou
In order to reduce the overdependence on petroleum-based products, the preparation of functional polymers with renewable resources has become a research hotspot. In this study, tung oil, extracted from tung tree seeds, was introduced to the synthesis of tung maleic anhydride (TOMA) and epoxidized tung oil ethanolamides (ETOE) via a simple modification of the conjugated double bonds and ester bonds of tung oil, and then tung oil-based vitrimers (PETVs) based on a dynamic hydroxyl ester exchange reaction were prepared with different ratios of ETOE to TOMA. Due to the presence of abundant hydroxyl esters and flexible aliphatic long chains, PETVs showed a fast and excellent self-healing performance, and their repair efficiency reached 94.7% at 160 °C for 10 min without any catalyst. In addition, PETVs exhibited excellent mechanical properties, alkali degradability, shape memory properties, and recyclability. Degradation experiments indicated that PETVs could be completely hydrolyzed to small-molecule substances in alkaline solutions. PETV/MWCNT composites (PMs) with excellent electrical and thermal conductivity exhibited rapid self-healing ability under the conditions of electrical, infrared radiation, and heating. Compared to conventional petroleum-based thermoset polymers, PETVs with the advantages of environmental friendliness and sustainability could provide a practical strategy to prepare high-performance vitrimers from renewable materials.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Chang Li,Qingrui Dai,Weidong Wu,Dong Yu Zhu,Xueqing Qiu
Cellulose plastic is an environmentally friendly material that shows excellent performance in the field of polymer materials. However, it exhibits a relatively high processing temperature, poor solvent resistance, and high performance loss during high-temperature reprocessing hindering its applications. We report the preparation of a cellulose-based grape-based vitrimer by grafting a bioepoxy cross-linker and an internal plasticiser (alkoxyglycidyl ether) onto a cellulose chain via an epoxy chemical reaction. The glass transition temperature, processability, and reprocessing conditions of the material were adjusted by changing the ratio of the crosslinking agent and the internal plasticizer. The prepared cellulose-based vitrimers had low glass transition temperatures, good processing and solvent resistance, and excellent reprocessing and recycling performance. The introduction of a covalent crosslinking network reduced the reprocessing temperature of the cellulose-based materials and avoided the migration and seepage of plasticizers. This study provides an important basis for the use of cellulose in the preparation of green and sustainable vitrimers for potential industrial applications.
研究领域:
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Le An,Rui Xiang,Heshan Bai
Vitrimers behave like traditional thermosets with good thermal and mechanical properties at service temperature, combined with thermoplastic behaviors above a specific temperature due to their dynamic cross-linked networks. However, there is a lack of effort in studying the mechanical properties of existing vitrimers, which are important for applying them in practical applications. The objective of this work is to experimentally investigate the tensile, compressive, flexural, torsional, and impact properties of a widely studied epoxy-based vitrimer through the various tests: tensile test, compressive test, three-point bending test, torsional test, and pendulum impact test. Since the vitrimer has the same chemical composition as conventional epoxy, all the mechanical tests mentioned above are also conducted on the epoxy for comparison. The results show that the vitrimer is comparable to the epoxy in tensile, compressive, flexural, and torsional properties, while its impact strength is substantially improved. Finally, the thermoplastic behaviors (i.e., reprocessing, recycling, reshaping) of the vitrimer are also studied.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER ENGINEERING
·
2021
·Vol. 41
·期 5
·365-374
·
IF 1.367
Weiqiang Lian,Huipeng Han,Xiaoxin Zhang,Guirong Peng,Zhaojing Jia,Zhenlin Zhang
Anhydride cured epoxy vitrimers usually exhibit desired mechanical strength but poor toughness and slow transesterification rate. Therefore, the repairing property of the material was restricted. In this paper, polyurethane modified epoxy vitrimer (PU-Epv) was prepared. PU was introduced into the vitrimer system of tetrahydrophthalic anhydride cured epoxy to improve the toughness of the material. Meanwhile, because of the presence of amino ester, the transesterification reaction was promoted and the activation energy of the transesterification was only 33.59 kJ/mol. In the thermal welding experiment, the material could be welded at least five times, and scratches on the surface of the samples could be efficiently repaired within 30 min. The toughness of the material was improved without damaging the strength. Meanwhile, the hard thermosetting epoxy was endowed with excellent repairing properties to increase the service life of the material.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2023
·
IF 5.3
Zhao Yanna,Hou Wentong,Huang Yuqing,Zhang Ting,Zhang Yingying,Wang Yuqi,Bai Xiaowei
In this paper, a bio-based polyamide imide polymer, PDPD (Polymer of D230, Poly hexa methylene diamide and Dialdehyde vanillin), was synthesized via amine aldehyde condensation reaction. PHMD was prepared from diethyl oxalate (ODE) and 1,6-hexanediamine (HAD), and vanillin was dialyzed to give dialdehyde vanillin (DVA). Then polyether amine D230 was introduced to obtain polyamide prepolymer, and triethyl citrate was used as cross-linking agent to prepare bio-based glass polymer material PDPD through bulk polymerization at high temperature. The thermal stability, glass transition temperature, mechanical properties, and energy storage modulus of PDPD material were investigated through thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and stress-strain curve. Results show that PDPD possesses excellent thermal stability and high mechanical strength, with a 5% thermal decomposition temperature at 288 °C, a stress of 7 MPa, and a strain of 117%. The storage modulus of PDPD in DMA testing can reach up to 2907 MPa. The anti-creep performance of PDPD is good, and the creep level after two repairs is within 40%. Self-healing testing revealed that PDPD maintained its performance after self-healing. The synthesized polymer is also recyclable, making it an attractive option for environmentally conscious applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2023
·
IF 3.4
Yanna Zhao,Yuqing Huang,Wentong Hou,Ting Zhang,Yingying Zhang,Yuqi Wang,Xiaowei Bai
Vitrimer films containing acylhydrazone bonds are synthesized in two steps. Bio-based vanillin and adipate dihydrazide are used to prepare diols containing acylhydrazone bonds in one step, which are introduced into the reaction system of vitrimer to obtain the final films. The process is concise and easy to operate. By utilizing the rigid structure of vitrimer films and introducing dynamic acylhydrazone bonds, the obtained vitrimer films exhibit strong mechanical strength (maximum tensile strength of 27.10 MPa and maintaining up to 185.52% of the original breaking strength), excellent self-healing property (tensile strength of 26.26 MPa after 12 h of primary self-healing and 5.24 MPa after 12 h of secondary self-healing), and rapid shape memory property (recovery time of about 2 min), strong acid and alkali resistance (not dissolved within 24 h), good thermal stability (no decomposition occurs below 160 °C), and high storage modulus (reaches 1087 MPa). These comprehensive benefits yield a certain reference for the preparation of vitrimer materials with prime properties. Graphical
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）