CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Fenglong Li,Zifa Xu,Han Hu,Zhengyang Kong,Chao Chen,Ying Tian,Wenwu Zhang,Wu Bin Ying,Ruoyu Zhang,Jin Zhu
Two of the very important demands for the elastic matrix of electronic skin (E-skin) are durability and degradability, which ensure the stable performance in daily life and green end of the E-skin. Unfortunately, these two requirements are usually incompatible. Here, we proposed the idea of controlled degradation and synthesized a polyurethane, AL-PU-4, to solve such challenge. High crystalline hydroxy-terminated poly (1,4-butylene adipate) (HTPBA) and low crystalline polycaprolactone diol (PCL diol) were mixed and used as the degradable soft segment. The dynamic disulfide bond was chosen as the chain extender, which could simultaneously endow the polyurethane with anti-aging and self-healing properties. The AL-PU-4 didn’t show significant loss in mechanical and molecular weight after 12 days of accelerated aging experiment, which equaled to 12 months of daily use, and it owned a fast room temperature self-healing speed of 1.31 μm/min. With the steric protection of the hard segment, the degradation of ester bonds in HTPBA and PCL diol segments was seriously retarded under enzymatic and low pH conditions. Only when the pH reached 14, the ‘lock’ on degradation was opened. The above functionalities were also verified in an E-skin demo, which could response the external pressure quickly and show high stability in cyclic test.
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
POLYMER
·
2024
·
IF 4.1
Chen Lin,Han Hu,Jiayi Li,Hanxu Zhu,Qingyang Luan,Juanfang Xu,Jinggang Wang,Jin Zhu
Bio-based and biodegradable polymers opens up opportunities to overcome resource depletion and plastic pollution . However, the degradation mechanism based on ester bond breakage makes it difficult to achieve controllable degradation induced by external stimuli. In this work, we present a new 2,5-furandicarboxylic acid-based copolyesters (PBFDi) by partially replacing carbon–carbon backbones with disulfide bonds and discuss the influence of disulfide bonds on thermal stability , crystallization behavior, mechanical and barrier properties of polyesters. They could maintain stable for 1 h at processing temperatures of 220 °C, meeting the needs of long-term melt processing. The asymmetric structure of the furan ring and the slower free rotation of disulfide bonds help restrict the mobility of chains and obstruct gas permeation, resulting in 9.3–126.7 times increase in O 2 barrier than commercial PBAT . With the introduction of small amount (≤40 %) of disulfide bond units, the hydrolysis rate is relatively slow and can maintain stable during storage and use. As expected, the copolyesters show redox dual-responsive degradation. Even at low concentrations (0.01 M and 0.1 M) of H 2 O 2 , the transition from hydrophobicity to hydrophilicity can be achieved, expected to accelerate the hydrolysis of PBFDi . The fast cleavage of disulfide bonds induced by DTT could be influenced by the copolymerized FDCA units. Lastly, the redox dual-responsive mechanism is elucidated, and how the rigid FDCA co-monomers affect the redox dual responsiveness is also clarified.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Pengtao Fang,Xingmei Lu,Qing Zhou,Dongxia Yan,Jiayu Xin,Junli Xu,Chunyan Shi,Yongquan Zhou,Shuqian Xia
Controlled degradation of macromolecules or natural macromolecules is important for their subsequent utilization. Normally, it is easier to degrade them to monomers than to oligomers in designated molecular weight range, the controlled degradation is much difficult to achieve and has been challenge for the utilization of macromolecules. Here, we proposed a strategy for simultaneous degradation of the inner and outer layers of PET , which avoid the degradation of polymers from the outside to the inside and achieved the controlled degradation. Under high temperature and micro-pressure conditions, PET is transformed from dense to flocculent structure by the swelling effect, which satisfies the need for simultaneous degradation of the inner and outer layers. In addition, a stable “Dawson” type Polyoxometalates (POMs) α 2 -K 8 P 2 W 17 O 61 X(H 2 O)‧16H 2 O (X = Zn, Mn, Co, Ni, Cu) with limited number of catalytic activity center was synthesized and applied to PET alcoholysis to obtain oligomer with given molecular weight range. Under the optimal conditions, PET: EG: POM catalyst = 1.0: 4.0: 0.02 (wt%), 240 °C, 10 min, PET was completely degraded and obtained the oligomer products (Mn < 2000 g/mol) with 72.1 % yield. By investigating the mechanism of the controlled alcoholysis, the formation of flocculent PET was be the key factor in achieving controlled degradation; hydrogen bonding and coordination of POMs are the key interactions to achieve rapid alcoholysis. Finally, oligomers were applied in the preparation of PET-PLA copolymers to follow sustainable route. The incorporation of bio-based polymers demonstrates better inclusiveness to the environment and contributes to harmonious development.
研究领域:
材料科学
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环境科学
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高分子化学
✓ 已验证
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2022
·Vol. 5
·期 2
·1221-1232
·
IF 11.806
Zhang Chentao,Sun Jiaxun,Lyu Sha,Lu Zhengyang,Li Tao,Yang Ye,Li Bin,Han He,Wu Bangyao,Sun Haoyang,Li Dandan,Huang Jintao,Sun Dazhi
The worldwide pandemic, coronavirus COVID-19, has been posing a serious threat to the global economy and security in last 2 years. The monthly consumption and subsequent discarding of 129 billion masks (equivalent to 645,000 tons) pose a serious detrimental impact on environmental sustainability. In this study, we report a novel type of nanofibrous membranes (NFMs) with supreme filtration performance and controllable degradation rates, which are mainly composed of polylactic acid (PLA) and artificially cultured diatom frustules (DFs). In this way, the filtration efficiency of particular matter (PM) and the pressure drop were significantly improved in the prepared PLA/DFs NFMs as compared with the neat PLA NFM. In specific, with incorporation of 5% DFs into fibers, PM 0.3 removal with a filtration efficiency of over 99% and a pressure drop of 109 Pa were achieved with a membrane thickness of only 0.1 mm. Moreover, the yield strength and crystallinity degree of the PLA/DFs5 NFMs were sharply increased from 1.88 Mpa and 26.37% to 2.72 Mpa and 30.02%. Besides those unique characters, the PLA/DFs5 presented excellent degradability, accompanied by the degradation of 38% in 0.01 M sodium hydroxide solution after 7 days and approximately 100% in natural condition after 42 days, respectively. Meanwhile, the environmentally friendly raw materials of the composite polylactic acid and artificially cultured diatom frustules could be extracted from corn-derived biomass and artificially cultivated diatoms, ensuring the conformance to carbon neutrality and promising applications in personal protection. Graphical abstract
研究领域:
材料科学
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环境科学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Manyuan Yin,Xiaoqin Zhang,Hao Wang,Zicheng Yuan,Hongxia Deng,Xianliang Jiang,Han Hu,Jin Zhu,Jinggang Wang
Finding a balance between thermo-mechanical properties and degradation properties is important for degradable polyesters to dissolve, addressing environmental problems. In this work, spiroglycol, an acetal monomer with symmetrical rigid spirocycles which can effectively increase the glass transition temperature (Tg) of polymers and easily hydrolyze in acidic environments, was introduced into poly(ethylene succinate) (PES) to synthesize poly(ethylene succinate-co-spirocyclic succinate) (PESS) copolyesters with contents ranging from 10 to 80 mol % spiroglycol units via melt polycondensation. As the spiroglycol unit content increases, the Tg, thermal resistance, and mechanical and barrier properties of the PESS copolyesters were obviously improved. Specifically, the glass transition temperature of PESS50 was enhanced up to 33.2 °C and it had a tensile modulus of 1398 MPa and tensile strength of 20.2 MPa, with an elongation at break of 333.4%. In addition, the barrier properties of PESS50 are significantly higher compared to PBAT and can achieve the purpose of food freshness preservation. The acidic cleavage of the spiroglycol unit can be accomplished in an acidic environment, while the ester bond can be hydrolyzed in an enzyme environment, achieving the goal of controlled degradation. As a result, while ensuring a certain degree of degradation performance, the thermo-mechanical properties have been improved.
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 Materials Chemistry A
·
2020
·Vol. 8
·期 22
·11261-11274
·
IF 11.301
Xiwei Xu,Songqi Ma,Sheng Wang,Jiahui Wu,Qiong Li,Na Lu,Yanlin Liu,Jintao Yang,Jie Feng,Jin Zhu
Covalent adaptable networks (CANs) provide a promising approach to solve the issue of recycling thermosets due to their dynamic cross-linked networks. However, CANs are susceptible to creep at relatively low temperatures, and their chemical stability is also inevitably doubtful. Here, we designed novel dihydrazone CANs by cross-linking a dihydrazone-containing epoxy monomer, which was synthesized from the condensation of a lignin derivative vanillin and hydrazinium hydrate, followed by a reaction with epichlorohydrin. Besides the excellent malleability and reprocessability, the dihydrazone CANs exhibited a high initial creep temperature of ∼105 °C, which was ascribed to the superior stability of the hydrazone bond at around 100 °C and favorable hydrazone exchangeability at elevated temperatures. Meanwhile, the degradation of the dihydrazone CANs exhibited temperature, solvent, and acidity dependence. Moreover, on account of the high antibacterial properties of the hydrazone bond, the CANs presented a high killing rate (95.8%) for Gram-negative bacteria (E. coli). Thus, this work discloses an effective dynamic covalent motif for the development of CANs with excellent dimensional stability, chemical resistance, and intrinsic antibacterial properties.
研究领域:
材料科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Liu Yang,Jiaqi Miao,Gen Li,Hao Ren,Tieshan Zhang,Dong Guo,Yifeng Tang,Wanfeng Shang,Yajing Shen
Recently, insect-scale soft robots have received increasing attentions for diverse applications owing to their ability to access hard-to-reach areas. However, most of them are composed of non-degradable materials like PDMS and silicone rubbers, and such chemical inertness may become an obstacle for future clinical applications where tunable material properties or degradation abilities are required. Here, we present a small-scale soft robot from a magnetic gelatin hydrogel, whose mechanical properties can be easily tuned through one-step Hofmeister effected-assisted reaction. Moreover, the robot is designed with insect claw-like legged structure, allowing it to perform grasping and cargo transportation tasks as its non-degradable counterparts. The degradation and controlled delivery ability of the robot are also demonstrated to show the advantages of magnetic hydrogels over non-degradable polymers. Our study provides an alternative for the tunable and degradable millirobot construction with an effective manipulation ability and promotes the applications of millirobot in biomedical sceneries.
研究领域:
生物医学工程
·
材料科学
·
机器人学
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 5
·1665-1676
·
IF 3.348
Haoyang Feng,Dandan Jin,Shuaipeng Wang,Jingyuan Hu,Jinyue Dai,Shifeng Yan,Xiaoqing Liu
Endowing epoxy resin with high performance, controllable degradation as well as feasible upcycling is a huge challenge. Herein, we synthesized a bio-based amine curing agent containing spiro diacetal unit using an environment-friendly method, then the controllable degradable epoxy resin was obtained after the curing reaction between diamine (DVPM) and bisphenol A epoxy resin (DGEBA). Results showed that DVPM-DGEBA resin performed high glass translation temperature of 136°C, glassy storage modulus of 3.93 GPa, and tensile strength of 85.9 MPa, owing to spiro diacetal unit and abundant methoxyl-related hydrogen bonds confirmed by non-isothermal fourier transform infrared spectra (FT-IR) and dynamic mechanical analyses. More importantly, DVPM-DGEBA resin could decompose into soluble linear oligomers in mild acidic solution. Systematically investigated by 1 H nuclear magnetic resonance, gel permeation chromatography, and FT-IR. Furthermore, the recycled oligomers could be reprocessed into thermosetting resins in the presence of diamines, and the upcycling resin performed high-performance (glass translation temperature of 170°C, glassy storage modulus of 6.03 GPa and tensile strength of 86.4 MPa) and flame-retardant (V-0 rating). This work gives us some new ideas to achieve the upcycling of the thermoset resin.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Zhipeng Yang,Shifeng Zhang,Zepeng Chen,Xuejun Lai,Hongqiang Li,Xingrong Zeng
With the rapid development of electronic skin, smart robots, etc., the past few years have witnessed explosive growth in the number of flexible sensors, and the resulting environmental contamination will be a great challenge. Herein, we propose a strategy to synthesize a polyurethane elastomer with good self-healing and controlled degradation properties for a flexible and stretchable strain sensor. First, polycaprolactone diol (PCL) and isophorone diisocyanate (IPDI) were used as monomers to synthesize the isocyanate-terminated prepolymer and further reacted with adipic dihydrazide (ADH) to obtain a polyurethane elastomer with hierarchical hydrogen bonds. By the prestretching method, a stretchable strain sensor was fabricated with carbon nanotubes as a conductive substance. The obtained elastomer exhibited high tensile strength (16.28 MPa), large stretchability (660%), superior crack tolerance, high self-healing efficiency (92.1%), and special controlled degradability (4 h in 0.5 mol/L NaOH solution). The sensor showed high sensitivity (GF = 111.4), fast response/recovery time (161/180 ms), and good repeatability (3000 stretching–releasing cycles) and was successfully applied for monitoring minute human movements. The strategy to prepare high-performance, self-healing and environmentally friendly elastomers in this work is of great significance for the sustainable development of flexible electronic devices.
研究领域:
材料科学
·
生物医学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2024
·
IF 3.9
Duanhui Gao,Hongyi Liu,Yanling Zheng,Zhekun Shi,Jiankun Hu,Fandong Meng,Xiaoli Zhan,Quan Liu,Qinghua Zhang
Graphical An imine-functionalized silicone-based epoxy coating with steady adhesion for enhanced marine antifouling and anticorrosion properties is prepared. The coating exhibits satisfactory comprehensive properties, and its controlled degradation can be achieved in aqueous solutions through temperature and acidity adjustments, which can refrain from incineration or landfilling after failure. The multifunctional coating conforms to the principle of green and sustainable development. Biofouling and corrosion of submerged equipment caused by marine organisms severely restrict the rapid development of the marine industry. Traditional antifouling or anticorrosion coatings typically serve a sole purpose and exhibit limited degradability upon failure, rendering them inadequate for current demands. Herein, a novel imine-functionalized command-degradable bio-based epoxy coating (SAHPEP-DDM) with enhanced integrated antifouling and anticorrosion performances was synthesized utilizing 1,3-bis (3-aminopropyl)-1,1,3,3-tetramethyldisiloxane and syringaldehyde. Compared with commercial epoxy resins (E51-DDM) and polydimethylsiloxanes (PDMS), the SAHPEP-DDM coating exhibits superior antifouling and anticorrosion properties due to the existence of –C=N- and Si−O−Si chain segments in the cross-linking network. The coating achieves resistance rates of 99.59 % and 99.20 % against E. coli and S. aureus , respectively, and shows promising resistance against algae and proteins, as well as excellent corrosion resistance in artificial seawater (with |Z| 0.01 Hz and arc radius of about 10 11 Ω and exceeding 10 10 Ω respectively). The coating also exhibits excellent chemical resistance in organic solvents as well as neutral and alkaline environments. Moreover, its controlled degradation after coating failure can be achieved in acid aqueous solutions through temperature and acidity adjustments, facilitated by the presence of –C=N-. This work presents a novel degradable coating successfully coupled the dual functions of antifouling and anticorrosion coatings, avoiding the employment of intermediate coat, indicating vast potential for application in various marine engineering fields.
研究领域:
材料科学
·
海洋工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Science
·
2025
·
IF 14.1
Lingling Fan,Weiliang Dong,Jianqi Lu,Yujia Peng,Bin Xie,Ping Wei,Min Jiang,Su Chen
Uncontrolled degradation of wound dressings may result in residues, causing several negative effects on wound healing, such as secondary damage, undesirable inflammation, and scar skin formation. Here, an available strategy associated with the synthesis of enzyme-loaded ( Burkholderia cepacia lipase, BCL) polycaprolactone (PCL) nanofiber scaffolds, aligning with wound healing effects is reported. These scaffolds are fabricated via fiber microfluidic electrospinning degradation-control technique. The obtained scaffolds exhibit tunable degradation rates, achieving complete degradation within 12–72-h cycles. The acidic degradation products are further elucidated and reveal the potential degradation mechanism. The acidic degradation products create an optimal microenvironment during the hemostasis and inflammation stages of wound healing. Notably, in vivo experiments demonstrate the enzyme-loaded scaffolds effectively promote angiogenesis, reduce inflammatory responses, mitigate collagen deposition, and regulate fibroblast differentiation. This promotes rapid wound healing with a remarkable scarless rate of over 99% by day 21. New guidelines for scar-free healing dressings are proposed, which carry out faster degradation without microplastics (MPs) and toxic byproducts before scar formation. These principles might provide valuable insights and promise for developing more effective wound dressings.
研究领域:
生物材料学
·
组织工程
·
再生医学
✓ 已验证
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Jingmei Li,Xin Liu,Shuangli Zhang,Luying Chen,Yujie Jiang,Rongyu Li,Xianhui Yin,Youhua Long,Yue Ma,Zhuo Chen
Liquid mulch, as a novel biodegradable mulch, can keep soil temperature and moisture, and also has the advantages of being applied without terrain restriction and biodegradable. However, the biodegradation of ordinary liquid mulch is not controllable and cannot meet the needs of different crop growth periods. In this study, we formulated a liquid mulch film (LMF) with pH-controllable degradation based on furfural and carboxymethyl chitosan, with polyvinyl alcohol , xanthan gum , and biochar added to improve the resistance to water solubility. The resulting LMF exhibited better mechanical strength and decreased light transmittance , air permeability , and water vapor permeability than commercial liquid mulch film (CLF). Compared with bare soli, LMF effectively reduced soil moisture evaporation and increased soil temperature , resulting in the growth promotion of cowpeas and maize with longer and thicker roots. Moreover, citric acid spraying could promote the degradation of LMF (9.26±1.64 %) and increase the abundance of beneficial bacteria in the soil. Overall, our study designed the controlled degradable LMF, which not only enhances crop growth but also fosters sustainable agricultural development .
研究领域:
农业科学
·
材料科学
·
环境科学
✓ 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）