ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Jiajun Liu,Yuan Liu,Zhiyi Hou,Tian Ju,Yuhan Lou,Zhihan Tong,Shi Liu,Jinsong Sun,Qinqin Xia,Haipeng Yu
Lignin, being the most abundant renewable aromatic polymer, exhibits immense potential in sustainable biobased epoxy adhesives. However, the tedious preparation process and uncontrolled homopolymerization of epoxidized lignin hinder their large-scale production. Herein, we propose a facile one-step strategy to synthesize a high-performance waterborne lignin-based epoxy adhesive based on the high selectivity of the phenol-epoxy reaction. Owing to the acidity difference between phenol and aliphatic hydroxyl, the phenolic hydroxyl groups in lignin can be preferentially initiated with epoxy groups, which inhibit the reaction on polyglycidol chain propagation. The resulting epoxidized lignin nanoparticles (ELNPs) feature nanoscale (150–250 nm), low molecular weight, and high epoxy value (∼3.84 mmol g–1). The ELNP colloidal dispersions possess high zeta potentials (−34.20 mV) and impressive long-term storage stability (temperature = 4–60 °C, pH = 2–12). The use of cost-effective ELNPs as a wood adhesive has shown a competitive shear strength of ∼14.89 MPa, comparable to those of commercial bisphenol A epoxy resin and phenol-formaldehyde resin. The thermo-curing ELNPs demonstrate excellent chemical solvent resistance and thermal stability (∼395 °C). Additionally, the one-step fabrication of ELNPs demonstrates good scalability (≥15 kg) and commercial viability (472 €/ton) in wood adhesives. This one-step synthetic strategy provides a promising pathway for producing high-performance and cost-efficient lignin-based epoxy resins that can be used as sustainable adhesives.
研究领域:
材料科学
·
化学工程
·
可持续发展
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产品关联
DOI
高影响因子
E-POLYMERS
·
2022
·Vol. 22
·期 1
·411-429
·
IF 3.074
Wenhao Yu,Weijun Yang,Pengwu Xu,Chunfa Dai,Qingsheng Liu,Piming Ma
The application of poly(lactic acid) (PLA) has been limited in flame-retardant field, and flame-retardant modification usually deteriorates its mechanical properties. In this study, a reactive flame-retardant hexa(ethylene oxide)-cyclotriphosphazene (HCCP-EP) was synthesized and used to improve the fire retardancy of PLA. As a result, the limiting oxygen index of PLA increased from 19.5% to 27.3% with an addition of 3 wt% HCCP-EP, and the PLA/HCCP-EP blend reached to underwriters laboratories (UL)-94 V-0 rating. The cone calorimeter test results showed that the peak heat release rate and total heat release of PLA decreased by 12.6% and 18.5%, respectively. Interestingly, the tensile strength of PLA increased slightly after the incorporation of HCCP-EP. The improved mechanical properties are ascribed to the fine dispersion of HCCP-EP and the coupling reaction between the epoxy groups of the HCCP-EP and the terminal groups of PLA during the melt processing.
研究领域:
材料科学
·
火灾安全工程
✓ 已验证
DOI
高影响因子
POLYMER BULLETIN
·
2023
·
IF 3.2
Xiong Ao,Li Junqian
Fabrication of waterproof decorative paintings has attracted a great deal of interest. In this work, in situ reaction using poly(glycidyl methacrylate) (PGMA) and polyhedral oligomeric silsesquioxane with amino group at end (amino-POSS) was utilized to fabricate coatings at surfaces of papery/cloth decorative paintings via spray, which endowed the decorative paintings with excellent hydrophobicity, transparency, and weather ability. Firstly, ring opening of epoxy groups in PGMA, cross-linking structure in coatings, and strong coating/painting interface adhesion were achieved. Then, surface morphology of coatings was observed, and high surface roughness was confirmed. Next, high transparency and thermal stability of coatings were confirmed. Finally, surface water-contact-angles (WCAs) of coatings with various substrates were tested as a function of POSS content. Weathering resistances of coating surface on cloth substrate were studied. Coatings exhibit excellent properties such as high light transmittance (over 80%), high glass-transition temperature (upper limit ~ 113 ℃), high hydrophobicity (maximum WCA ~ 149°), and strong weathering resistances (the aged WCAs over 140°). Work innovation lies in simultaneously gained high hydrophobicity, good transparency, and strong weather ability. This work might pave a road for fabricating excellent coatings for protecting decorative paintings.
研究领域:
材料科学
·
文物保护
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产品关联
DOI
高影响因子
Polymers
·
2015
·Vol. 7
·期 5
·896-908
·
IF 3.681
Ting Huang,Bo Jin,Ru Fang Peng,Cong Di Chen,Rong Zong Zheng,Yi He,Shi Jin Chu
A new functionalized [60]fullerene-glycidyl azide polymer (C60-GAP) was synthesized for the first time using a modified Bingel reaction of [60]fullerene (C60) and bromomalonic acid glycidyl azide polymer ester (BM-GAP). The product was characterized by Fourier transform infrared (FTIR), ultraviolet-visible (UV-Vis), and nuclear magnetic resonance spectroscopy (NMR) analyses. Results confirmed the successful preparation of C60-GAP. Moreover, the thermal decomposition of C60-GAP was analyzed by differential scanning calorimetry (DSC), thermogravimetric analysis coupled with infrared spectroscopy (TGA-IR), andin situFTIR. C60-GAP decomposition showed a three-step thermal process. The first step was due to the reaction of the azide group and fullerene at approximately 150 °C. The second step was ascribed to the remainder decomposition of the GAP main chain andN-heterocyclic at approximately 240 °C. The final step was attributed to the burning decomposition of amorphous carbon and carbon cage at around 600 °C.Keywords:C60;glycidyl azide polymer (GAP);thermal analysis;energetic material
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
COMBUSTION AND FLAME
·
2025
·
IF 6.2
Yang Chen,Junfei Ou,Tianyu Yang,Baozhong Zhu,Yunlan Sun
The restricted energy release efficiency has been a significant hindrance to the utilization of boron (B) powder as a fuel in solid propellants because of the presence of oxidation film on the B surface. To address this issue, poly (vinylidene fluoride-co-hexafluoropropylene) (Viton A) and glycidyl azide polymer (GAP) were used for the collaborative modification of micron-sized boron (µB) powder. The thermal oxidation, ignition, and combustion performance of µB before and after modification were investigated by thermogravimetric-differential thermal analysis (TG-DTG), differential scanning calorimetry (DSC), and carbon dioxide laser ignition testing. The dual-layer coating interface structure of B@Viton A@GAP is more conducive to reducing the ignition delay time, accelerating the flame expansion rate, enhancing the combustion intensity, improving the combustion efficiency, and reducing agglomeration of combustion products of B powder. The study offers an effective method to promote the combustion of B through its modification with Viton A and GAP.
研究领域:
材料科学
·
燃烧与推进
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 11
·4538-4546
·
IF 3.288
Mei Wang,Shouhai Li,Haiyang Ding,Jianling Xia,Mei Li
In the present work, tung-oil-derived imide epoxidized esters (GEABTMI) were prepared and used as poly(vinyl chloride) (PVC) co-stabilizers. Characterization results confirmed the successful preparation of the targeted material. The thermal stabilizing effects of CaSt2/ZnSt2/GEABTMI (St: stearic acid) were compared with those of CaSt2/ZnSt2/ABTMI {ABTMI: N-(3-amino-benzoic acid) tung-maleimides} and CaSt2/ZnSt2. The experimental results showed that of the materials tested, CaSt2/ZnSt2/GEABTMI could provide the best long-term thermal stability for PVC. According to the thermal stability results and characterization, the simultaneous introduction of imide and epoxy groups into the GEABTMI structures was responsible for the excellent performance of the stabilized PVC. Furthermore, a mechanism for the stabilization of the PVC/CaSt2/ZnSt2/GEABTMI system was proposed. According to this proposal, the imide groups trapped the labile chlorine atoms removed from the PVC chain and reacted with the unstable macromolecular radical of PVC, disrupting in this way the radical chain degradation of PVC; and the epoxy group acted as an HCl absorber at the subsequent stages of degradation, avoiding in this way the harmful effects caused by the presence of HCl. Apart from the better stabilization performance, CaSt2/ZnSt2/GEABTMI yielded a PVC plasticization performance similar to those resulting from the use of the other stabilizers.
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
Nanomaterials
·
2021
·Vol. 11
·期 8
·1898
·
IF 5.076
Zhengdong Wang,Xiaozhuo Wang,Silong Wang,Jieyu He,Tong Zhang,Juan Wang,Guanglei Wu
Polymer-based composites with high thermal conductivity and dielectric breakdown strength have gained increasing attention due to their significant application potential in both power electronic devices and power equipment. In this study, we successfully prepared novel sandwich AlN/epoxy composites with various layer thicknesses, showing simultaneously and remarkably enhanced dielectric breakdown strength and thermal conductivity. The most optimized sandwich composite, with an outer layer thickness of 120 μm and an inner layer thickness of 60 μm (abbreviated as 120-60) exhibits a high through-plane thermal conductivity of 0.754 W/(m·K) (4.1 times of epoxy) and has a dielectric breakdown strength of 69.7 kV/mm, 8.1% higher compared to that of epoxy. The sandwich composites also have higher in-plane thermal conductivity (1.88 W/(m·K) for 120-60) based on the novel parallel models. The sandwich composites with desirable thermal and electrical properties are very promising for application in power electronic devices and power equipment.Keywords:sandwich epoxy-based composites;aluminium nitride;dielectric properties;thermal conductivity
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2021
·
IF 3.512
Xinhua Liu,Peng Yan,Yinchun Fang
Structural color as a revolutionary coloration strategy has been proposed to replace the traditional dyeing and printing process. However, the poor colorfastness and easy crack formation of structural colors on textile fabrics restrict their practical application at present. In this study, poly (tert-butyl acrylate-co-glycidyl methacrylate) (P(t-BA-co-GMA)) copolymers containing reactive epoxy groups with different mass ratios of tert-butyl acrylate (t-BA) and glycidyl methacrylate (GMA) were successfully synthesized, which were used to create structural colors on black polyester fabrics. The results showed that P(t-BA-co-GMA) nanospheres could form crack-free structural colors on polyester fabrics, and the colors vary with the mass ratio of t-BA and GMA to obtain five different colors. The different particle sizes of the different P(t-BA-co-GMA) nanospheres with different refractive indexes and the arrangement of short-range ordered and long-range disordered in microstructures may be the reason of different angle-independent structural colors on polyester fabrics. The P(t-BA-co-GMA) nanosphere structural colors on polyester fabrics possess good abrasion and washing colorfastness. This research provides the experimental basis for the development of crack-free amorphous photonic crystal structural color on fabrics with high colorfastness to promote the practical application of structural color in textile coloration.
研究领域:
材料科学
·
纺织工程
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Wenqing Wang,Hao Li,Yongquan Zhou,Jianming Pan
The emulsion method is a typical way for the preparation of nanomaterials, however, it usually requires a lot of energy and surfactants to form and stabilize of emulsions. A critical factor limiting its application is to control the morphology of the material by modulating the size of the emulsion droplets. In this work, a novel solid-water–oil (S-W-O) system based on the integration of metastable emulsion and salt template method was proposed, and the functionalized silica nanosheets were prepared by the one-pot method. The size of the prepared nanosheets is relatively uniform, with a length of 800 to 1200 nm and a width of about 200 nm. Subsequently, a large number of epoxy group sites were introduced into the nanosheets relying on distillation precipitation polymerization, and the polyol groups were successfully loaded. Finally, the polyol-functionalized nanosheet adsorbent (NS@GMA-NMDG) was obtained and applied for the rapid removal of boron. NS@GMA-NMDG shows favorable adsorption performance for boric acid in solution, with a maximum adsorption capacity of about 35.49 mg g −1 based on the Langmuir model fitting and a fast adsorption rate of about 30 min to reach 96.3% of the adsorption equilibrium concentration. Remarkably, the investigation of the formation mechanism of nanosheets reveals that salt plays an important role in the S-W-O system. This study not only puts forward a novel method of designing and synthesizing nanosheet adsorbents, but also the application of surfactant-free and low-energy emulsification reflects the concepts of energy saving and clean production, which provides fresh inspirations for the development of new environmentally friendly adsorbents.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Cuicui Guo,Yiling Wang,Yijing You,Mingjun Chen,Ka Zhang,Shengmiao Zhang
Many advanced materials are designed for the removal of heavy metal ions from water. However, materials for eliminating trace heavy metal ions from wastewater to meet drinking water standards remain a major challenge. Herein, epoxy group-functionalized open-cellular beads are synthesized by UV polymerization of a water-in-oil-in-water system. The epoxy groups are further transformed into diethylenetriaminepentaacetic acid (DTPA) with hexamethylene diamine as a bridging agent. The resulting material (DTPA@polyHIPE beads) can eliminate trace Cu(II), Cr(III), Pb(II), Fe(III), or Cd(II) from water. When 0.15 g of DTPA@polyHIPE beads are used to adsorb metal ions of 20 mg in 100 mL of water, the residue concentrations of Cu(II), Cr(III), Pb(II), Fe(III), and Cd(II) are reduced to 0.08, 0.06, 0.02, 0.09, and 0.07 mg/L, respectively. The adsorption efficiencies of the beads for these ions are all higher than 99.55%. The adsorbent is durable and exhibits good recyclability by retaining an adsorption capacity of ≥91% after 5 cycles. The negative values of ΔG in the adsorption process indicate that the adsorption is feasible and spontaneous. The chemical adsorption follows the Freundlich adsorption model, indicating a multilayer heterogeneous adsorption. The DTPA@polyHIPE beads have a great potential application in dealing with trace heavy metal ion polluted water.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2016
·Vol. 7
·期 40
·6202-6210
·
IF 5.687
Yaochen Zheng,Shengying Cai,Li Peng,Yu Jin,Han Xu,Zhulin Weng,Zhengguo Gao,Bo Zhao,Chao Gao
We have coined a new term, group interval-controlled polymers (GICPs), to describe the unique structure of macromolecules with a tunable functional group interval. The precise control of a polymer main chain structure itself is still a big challenge, let alone the purposeful control of group interval simultaneously. Here, we successfully synthesized a series of epoxy GICPs via one-step UV-triggered thiol–yne polymerization of commercial glycidyl propargyl ether and dithiols at 0 °C. Subsequently, α,ω-thiols of each epoxy GICP were capped by two allyl glycidyl ethers via a thiol–ene click reaction, affording a stable product. Their unique group interval-controlled chemical structures were confirmed by a combination of nuclear magnetic resonance (NMR), gel permeation chromatography (GPC) and pyrene-fluorescent probe tests. Moreover, the epoxy groups within the GICPs were highly reactive and could be further functionalized and turned into a diverse range of customized groups such as azide, tertiary amino, thioester, and hydroxyl, etc. Therefore, a series of GICPs with designed functional groups are readily achieved on a large scale. Our work presents a reliable synthetic methodology for GICPs, paving a new way for the precise structure control of artificial macromolecules.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 14
·8528-8543
·
IF 4.22
Wang Junchao,Zhang Zetian,Xie Taoling,Sun Liying,Yang Kaifeng,Liu Yang,Li Zhengjun
Polyhedral oligomeric silsesquioxanes (POSSs) can be utilized to prepare nanocomposites to improve their physical and mechanical properties significantly by physical interaction and chemical cross-linking. The purpose of this work is to prepare a kind of water-dispersive POSS containing multiple epoxy groups and then use it to prepare gelatin/POSS nanocomposites to enhance their thermal and mechanical properties. Accordingly, 3-glycidyloxypropyl-POSS (G-POSS) was synthesized by a complete hydrolysis and condensation method. Then, G-POSS was modified with polyetheramine to obtain a derivative material of POSS, denoted as P-G-POSS, which possess better water dispersion and flexibility. Importantly, the chemical structure of both G-POSS and P-G-POSS was confirmed by FT-IR, NMR, XPS and EDS analyses. Subsequently, POSS/gelatin nanocomposites were prepared in accordance with 1:1, 2:1 and 3:1 of epoxy/amino mole ratios in alkaline aqueous medium. The microscope porous structure, thermal stability, mechanical properties, along with water absorption of the composites containing various contents of P-G-POSS, were emphatically studied and discussed. The results indicated that composites possessed the maximum denaturation temperature up to 80.1 °C, as well as the increased initial decomposition temperature and residual mass at 700 °C, and particularly improved mechanical properties after incorporation of P-G-POSS into gelatin matrix. The reason is likely that the cross-linking reaction of epoxy groups in P-G-POSS with amino groups in gelatin macromolecules, along with hydrogen bonding, played an important role in the as-prepared gelatin/POSS composites. This study would be helpful to promote the application of POSSs in bone tissue regeneration and leather cleaner production.
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
危险品化学品经营许可证（带存储）