INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Pei Huan Wu,Yun Qi Li,Yang You,Cai Juan Huang,Hai Bo Xie,Ming Qiu Zhang
Introducing dynamic covalent bonds (DCBs) into polyurethane (PU) foams can solve the problem of their poor recyclability. However, a dilemma arises between reprocessability and mechanical robustness because of the low bond energies of DCBs. In this work, an aromatic diol (VAN-AM) containing imine bonds is synthesized to serve as the polyol together with castor oil. A series of bio-based polyurethane foams (BPUFs) with tunable bio-based carbon content, apparent density, cell properties and mechanical properties are prepared by adjusting the proportions of VAN-AM and castor oil. Benefiting from the molecular rigidity of VAN-AM, the dynamic imine bonds are enriched in the hard domains of PU. This allows for the kinetic control of the dynamicity of the PU networks. When the foams work at ambient temperature, which is much lower than the glass transition temperature of PU (113 ºC), the frozen segments of the hard domains inhibit the dynamic behavior of the imine bonds even if the latter may be somewhat activated (their triggering temperature ≈ 50 ºC). Consequently, the good mechanical properties of BPUFs can be maintained during service. At higher temperatures (> 113 ºC) or swollen state, the segmental mobility in the hard domains and dynamicity of imine bonds are greatly enhanced. Recycling of BPUFs is enabled as evidenced by hot-pressing the crushed foams into the compact sheets under mild conditions. The findings would facilitate the rational design of crosslinked polymeric foams with both high reprocessability and mechanical performance.
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
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Xiaoman Tang,Yongbin Huang,Xiulan Guo,Chang-An Xu,Teng Yuan
Although bio-based polyurethane materials have attracted much attention due to their characteristics such as renewable and long service life conventional polyurethane materials do not have self-healing properties due to structural limitations, leading to their limited application. Imine bond is a kind of dynamic and reversible covalent bond, which can self-heal damaged materials under mild conditions. Based on this, this work utilized p-phthalaldehyde and poly (propylene glycol) bis (2-aminopropyl ether) to prepare T-NH monomers containing imine bonds. Subsequently, four kinds of bio-based polyurethanes containing T-NH were synthesized from castor oil, epoxy soybean oil, glycerol monostearate, and Sorbitan monooleate under UV conditions. The self-healing performance of bio-based polyurethane materials containing imine bonds was evaluated through optical microscopy and mechanical properties. The results showed that the coating had certain self-healing properties at room temperature, and the self-healing efficiency of the coating was greatly improved when heated to 50°C. Among them, the polyurethane material prepared from glyceryl monostearate had the best self-healing ability, with a self-healing efficiency of 90% and a healing cycle of 4 times. This work not only enhanced the added value of biomass materials but also provided a reference for the preparation of polyurethane materials with self-healing properties.
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
CHINESE JOURNAL OF POLYMER SCIENCE
·
2024
·
IF 4.1
Wu Shan-Song,Lu Hui-Juan,Li Yi-Dong,Zhang Shui-Dong,Zeng Jian-Bing
Poly(butylene succinate) (PBS) exhibits many advantages, such as renewability, biodegradability, and impressive thermal and mechanical properties, but is limited by the low melt viscosity and strength resulted from the linear structure. To address this, vitrimeric network was introduced to synthesize PBS vitrimers (PBSVs) based on dynamic imine bonds through melt polymerization of hydroxyl-terminated PBS with vanillin derived imine containing compound and hexamethylene diisocyanate using trimethylolpropane as a crosslinking monomer. PBSVs with different crosslinking degrees were synthesized through changing the content of the crosslinking monomer. The effect of crosslinking degree on the thermal, theological, mechanical properties, and stress relaxation behavior of the PBSVs was studied in detail. The results demonstrated that the melt viscosity, melt strength, and heat resistance were enhanced substantially without obvious depression in crystallizability, thermal stability, and mechanical properties through increasing crosslinking degree. In addition, the PBSVs exhibit thermal reprocessability with mechanical properties recovered by more than 90% even after processing for three times. Furthermore, PBSV with improved melt properties shows significantly improved foamability compared to commercial PBS. This research contributes to the advancement of polymer technology by successfully developing PBS vitrimers with improved properties, showcasing their potential applications in sustainable and biodegradable materials.
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
Polymer Chemistry
·
2018
·Vol. 9
·期 7
·878-884
·
IF 4.927
Yangchun Tao,Siwei Liu,Yi Zhang,Zhenguo Chi,Jiarui Xu
In this study, pentaerythritol tetra(3-mercaptopropionate)-allylurea-poly(ethylene glycol) (PETMP-AU-PEG), produced by the Schiff-base reaction between terminal-aldehyded PEG and PETMP-AU, was used to prepare doxorubicin (DOX)-loaded polymers for triggered release. The DOX-loaded PETMP-AU-PEG polymers had sizes of about 200 nm, non-toxicity and highly pH-sensitive properties. An in vitro release study confirmed that the polymer could release DOX rapidly by cleavage of acid-labile imine bonds of the polymer. The release of DOX at neutral pH was very slow. However, in a weakly acidic environment (pH 6.8 and pH 6.0), it released much faster within the first 2 h. Fluorescence microscopy further verified that DOX released from PETMP-AU-PEG polymers could be pH sensitive. According to the results of cytotoxicity determination and microscopy imaging of U2OS cells (human osteosarcoma, tumor cells) and MC3T3-E1 Subclone 14 cells (normal tissue cells), the DOX-loaded polymers could maintain high stability in the neutral environment while they release DOX rapidly in response to the very weakly acidic environment. Moreover, it is more important that the U2OS could be inactivated in the micro-acidic environment produced by its own growth, even in a neutral environment, without any chemical reagent addition.
研究领域:
生物材料学
·
药物递送系统
·
肿瘤治疗
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 12
·4745-4754
·
IF 3.665
Zhihui Shang,Dongliang Ding,Xu Wang,Bingru Liu,Yanhui Chen,Lei Gong,Zhenguo Liu,Qiuyu Zhang
Up to now, low thermally conductive properties and irreversible damage caused by the accidental mechanical failure are still the main negative factors for the wide application of polymer thermal management materials in the microelectronic industry. In this work, we prepared self-healing polydimethylsiloxane/boron nitride nano sheets (PDMS/BNNSs) composites with high thermal conductivity. PDMS elastomer with the dynamic reversible imine bond acts as the polymer matrix and BNNSs with NH 2 in regularly in-plane arrangement are used as the thermally conductive filler. When the BNNSs filler content is 30 wt%, the thermal conductivity is increased by 588%; The self-healing efficiency reaches more than 85%, driven by the reversibility of the dynamic imine bond within PDMS; In addition, the tensile strength and the thermal stability exhibit an enhancement of 275% and 31.8°C, respectively, compared to the pure self-healing PDMS elastomer.
研究领域:
材料科学
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热管理材料
·
高分子化学
✓ 已验证
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2020
·Vol. 298
·期 3
·285-291
·
IF 1.536
Wang Minying,Mo Baohang,Chen Birong,Jiang Linbin,Yang Hua
PAM/OSA/PVA hydrogel was prepared by simple copolymerization using acrylamide (PAM), oxidized sodium alginate (OSA), and poly (vinyl alcohol) as monomers. The hydrogel exhibited a quadruple-shape memory effect based on imine, coordination, and borate bonds. Self-healing properties of the quadruple-shape memory hydrogel were observed to evolve due to the imine and borate bonds. The hydrogel demonstrated tunable mechanical properties because of supramolecular interactions including OSA –Ca 2+ , PVA –borax, and OSA –PAM in different conditions. The new hydrogel is envisaged to increase the variety as well as broaden the design and manufacturing of shape memory hydrogels.
Dual multi-shape memory images of PAM/OSA/PVA hydrogel and its shape memory mechanism.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2025
·
IF 5.2
Xiaoxu Liu,Zilu Liu,Jing Bai,Fei Chen
Dynamic cross-linked polymers have garnered attention due to their recyclable nature. Research on constructing dynamic cross-linked polymers with various dynamic chemical bonds has achieved numerous outstanding outcomes. Nevertheless, studies on mechanisms such as polymer chains’ movement, energy transformation, and dissipation within the dynamic cross-linked network have been relatively scarce, which is the essential determinant for the ambient-temperature usage and high-temperature recycling characteristics of dynamic cross-linked polymers. This research uses the widely studied dynamic imine bonds as a representative to investigate dynamic cross-linked polymers. Through the utilization of rheological tests, the dynamic and static properties were tested and analyzed at the polymer chain level, explaining the mechanical property stability of dynamic cross-linked polymers during ambient-temperature service and the influence of dynamic performance on the energy dissipation mechanism, further clarifying the potential application mechanism in materials such as shock absorption. Simultaneously, it also demonstrated the polymer chain structure basis for their recycling.
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
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Kaiyin Li,Shuai Wang,Yue Jiang,Mingqing Chen,Weifu Dong,Dongjian Shi
Epoxy resins are widely utilized in many fields due to their good mechanical properties, thermal properties, and chemical stability. However, most of the reported epoxy resins are characterized as nondegradable and nonrecyclable thermosetting materials, causing great environmental pollution and resource waste. Herein, we report a fully bio-based and recoverable epoxy resin using a bio-based epoxy monomer and curing agent. The epoxy monomer (VAN-TA-EP) was synthesized by a Schiff base reaction based on vanillin (VAN) and Tris(2-aminoethyl)amine (TA) and further epoxidated. The bio-based imine curing agent (DI) was synthesized from diformylfuran (DFF) and isophorone diamine (IPDA). The resultant epoxy resin TA/DI that composed of VAN-TA-EP and DI, showed high performance, degradability, and recyclability. The tensile strength of the prepared bio-based epoxy resin reached a maximum of 104 MPa, which is significantly higher than that of the conventional DGEBA/DDM (59 MPa). The epoxy resin was demonstrated to be heated and reshaped by the imine metathesis, which was experimentally confirmed. Furthermore, the cross-linked resins have good degradability to the acid- or base-induced hydrolysis of imine bonds. This study paves the way for the preparation of high-performance and recyclable bio-based epoxy resins.
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
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 21
·13400-13410
·
IF 10.733
Fei Song,Zhaoshuang Li,Puyou Jia,Meng Zhang,Caiying Bo,Guodong Feng,Lihong Hu,Yonghong Zhou
The preparation of multifunctional polymer materials from natural renewable resources via a simple method meets ever-expanding practical applications and matches sustainable development strategies. We synthesized a multifunctional polymer with a dual-dynamic three-dimensional (3D) crosslinked network of hydrogen bonds and dynamic imine bonds from epoxy soybean oil and vanillin via a simple preparation process. The as-prepared polymers have controllable mechanical strength between ultrahigh stretchability (strain at break: over 2800%) and rigidity (bending strength: 25.51 ± 0.27 MPa with a strain at break of approximately 2%) via varying imine bonds to readily tailored. They can be used as reusable adhesive. The highly dynamic nature of the hydrogen and imine bonds allows the damaged polymer to self-heal, and it can be re-recycled multiple times. The healed and recycled polymer regains most of its mechanical strength. The polymer exhibits both permanent and temporary shape memory at the same temperature via solid state plasticity, i.e., topological polymer network rearrangement resulting from dynamic bond exchange. Furthermore, our polymers can be used to prepare conductive adhesives/composites that are self-healing, recyclable, and re-shapable.
研究领域:
材料科学
·
可持续化学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2021
·
IF 5.985
Zhi Rong Ou,Wei Li Peng,Min Zhi Rong,Ming Qiu Zhang
A novel strategy for controllable depolymerization and recovery of polymer blends is proposed. The core advance lies in the application of reversible boronic ester bonds and imine bonds, which possess the abilities of correlative scission and rebuilding. Accordingly, reversibly interlocked polymer networks (RILNs) are prepared from two preformed crosslinked polymers, which respectively carry the two reversible bonds. By taking advantage of the intimate packing of the macromolecules from the two networks in the RILNs, the cascading effect between boronic ester bonds and imine bonds is enabled. When the dimethylformamide swollen RILNs are triggered by a little water, the boronic ester bonds in one component network are decomposed, affording boronic acid, which subsequently catalyzes the cleavage of the adjacent imine bonds in the other component network. Meanwhile, scission of the imine bonds also promotes decomposition of the boronic ester bonds as well. The cascading processes can be reversed via dehydration-induced reformation of boronic ester bonds. Hence, RILNs are allowed to be depolymerized in a controlled manner and then recovered by removing the solvent and water.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Xiao-Li Zhao,Yi-Dong Li,Yunxuan Weng,Jian-Bing Zeng
Biobased epoxy covalent adaptable networks (ECANs) with renewability, recyclability, and reprocessability are thought as ideal alternatives to petroleum-based epoxy thermosets with respect to sustainable development. In this study, biobased ECANs based on dynamic imine bonds were prepared from glycerol triglycidyl ether (GTE), vanillin (VA), and diamines via a facile two-step solvent-free procedure. In detail, a trialdehyde monomer was first synthesized via ring-opening reaction of GTE with VA and then cured with diamines to obtain imine-based ECANs with a carbon biobased content of > 50.0%. The biobased ECANs had an excellent tensile strength (> 70 MPa), Young’s modulus (> 2500 MPa), and T g (> 90 °C) due to the introduction of rigid imine bonds, several aromatic groups, and the conjugated systems formed between imine bonds and benzene rings. Meanwhile, the incorporation of C N structure endowed ECANs with UV shielding properties. Based on the topology rearrangement induced by exchange reaction of imine bonds, ECANs exhibited excellent malleability with a stress relaxation time < 30 s at 120 °C. Thus, they showed reprocessability without sacrificing the mechanical and thermal performance. Moreover, biobased ECANs could be used as high-performance recoverable adhesives for aluminum with an original and recovered lap shear strength of > 53.9 MPa and > 40.0 MPa, respectively.
研究领域:
材料科学
·
可持续发展
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2023
·Vol. 29
·期 21
·e202203478
·
IF 4.3
Wangyi Zeng,Longjiang Deng,Guang Yang
Graphical A strain sensor (PIH 2 T 1 -tri/CNT-3) composed of self-repairable crosslinked elastomer substrate and conductive layer was prepared. The PIH 2 T 1 -tri elastomer had excellent self-healing ability and good mechanical integrity. The PIH 2 T 1 -tri/CNT-3 sensor had high sensitivity, short response time, and long-term durability. Self-healable and stretchable elastomeric material is essential for the development of flexible electronics devices to ensure their stable performance. In this study, a strain sensor (PIH 2 T 1 -tri/CNT-3) composed of self-repairable crosslinked elastomer substrate (PIH 2 T 1 -tri, containing multiple reversible repairing sites such as disulfide, imine, and hydrogen bonds) and conductive layer (carbon nanotube, CNT) was prepared. The PIH 2 T 1 -tri elastomer had excellent self-healing ability (healing efficiency=91 %). It exhibited good mechanical integrity in terms of elongation at break (672 %), tensile strength (1.41 MPa). The Young's modulus (0.39 MPa) was close to that of human skin. The PIH 2 T 1 -tri/CNT-3 sensor also demonstrated an effective self-healing function for electrical conduction and sensing property. Meanwhile, it had high sensitivity (gauge factor (GF)=24.1), short response time (120 ms), and long-term durability (4000 cycles). This study offers a novel self-healable elastomer platform with carbon based conductive components to develop flexible strain sensors towards high performance soft electronics.
研究领域:
材料科学
·
柔性电子学
·
生物医学工程
✓ 已验证
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）