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
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化学工程
·
可持续发展
✓ 已验证
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
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
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材料科学
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2016
·Vol. 7
·期 40
·6202-6210
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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
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材料科学
✓ 已验证
DOI
高影响因子
SYNTHETIC METALS
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2019
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IF 2.87
Yujuan Jing,Pingquan Wang,Qiangbin Yang,Yi He,Yang Bai
Epoxy coatings play an important role in preventing the corrosive medium penetrating into the base metal, but improving its durability in harsh environments is still a challenge. Nanomaterial introduced in epoxy coatings is an effective improvement measure, especially, the use of two-dimensional nanomaterial can effectively block the corrosion medium. In this paper, we use two-dimensional molybdenum disulfide (MoS 2 ) hybrid materials as nanofiller to improve the corrosion resistance of epoxy coatings. MoS 2 hybrid materials were obtained by an effective method based on self-oxidation of dopamine and functionalized silane (KH560) grafting. The poly(dopamine) and epoxy groups on the surface of MoS 2 enhanced the interaction with EP matrix. The anticorrosive performance of composite epoxy coating with the different content of MoS 2 hybrid materials was investigated in detail. An appropriate content (0.8 wt%) in the epoxy coating was obvious to improve its anti-corrosion performance.
研究领域:
材料科学
·
腐蚀防护
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
·
2021
·Vol. 28
·期 4
·689-695
·
IF 1.993
Hong-ying Chu,Hua-bei Li,Xiao-yan Sun,Yao-wang Zhang
The objective of this study is to synthesis biomass-based plasticizer epoxy p -phenylenedioleic acid ester (EPAE) using linoleic acid as raw materials via esterification and epoxidation. EPAE was used as main plasticizer of polyvinyl chloride (PVC) to replace diisobutyl phthalate (DIBP). The plasticizing effect of EPEA on the performance of PVC films was investigated. The results showed that epoxy groups were covalently bonded on branched chains of EPAE. EPAE play a plasticizing role by forming hydrogen bond between epoxy group and a-hydrogen on PVC. When the mass of EPAE was 0.8 g in 2 g PVC, Tg of flexible PVC reached 36.1°C, the elongation at break of flexible PVC was 321.12 ± 6.13%, while the tensile strength reached 19.45 ± 1.35%. The transmittance of DIBP-0.8 and EPAE-0.8 at 800 nm is nearly 70%, indicating relatively high homogeneous amorphous aggregation structures. EPAE showed marginal resistance to volatilization and solvent extraction. The mechanism behind the results was discussed.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
POLYMER TESTING
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2017
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IF 2.464
Wei-Qi Xie,Xin-Sheng Chai
This work reports on a new method for the determination of epoxy groups in epoxy resins by reaction-based headspace gas chromatography (HS-GC). After epoxy resins reacted with hydrochloric acid (HCl) solution, the remaining HCl reacted with bicarbonate solution in a closed headspace vial to form carbon dioxide that was measured by HS-GC. It was found that the first reaction can be finished in 30 min at room temperature and the second reaction, together with headspace equilibration, can be achieved within 15 min at 60 °C. The results showed that the method has a good precision and accuracy, in which the relative standard deviation in the repeatability measurement was 4.20%, and the relative differences between the data obtained by the HS-GC method and the reference method were within 8.04%. The present method is simple, efficient, and suitable for the used in the epoxy resin related research and applications.
研究领域:
分析化学
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材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Dongsheng Ma,Xu Liao,Xiaofeng Li,Yang Liu,Xiumei Zhang
The development of degradable food packaging materials with hydrophobic and oleophobic properties is a key to focus in reducing plastic waste. Chitosan is gaining interest for its versatility and easy modification, but its application is limited by the poor hydrophobicity and oleophobicity. Using polymers to modify chitosan films has been shown as a promising approach to solve this issue. In this study, the modified films (CS/xmono-PDMS-E, where x = 0.25, 0.5, 1, 2, and 3 %) were prepared by utilizing mono-terminal epoxy-terminated polysiloxane (mono-PDMS) and chitosan (CS) through chemical grafting. The qualities of these films were characterized. CS/xmono-PDMS-E films were demonstrated to have enhanced hydrophobicity, oleophobicity, moisture resistance, and thermal stability in comparison to CS films. Furthermore, because Si O Si has a greater bonding energy in the PDMS chain segment, the CS/xmono-PDMS-E films showed superior UV shielding. The resistance to weathering of CS/xmono-PDMS-E films was also greatly enhanced by the low surface energy of PDMS, which moved to the surface during drying. By combining experimental design with result characterization, this work provides a new strategy for bio-based packaging materials featuring with green double sparse coatings, showing great potential for low-carbon recycling applications.
研究领域:
材料科学
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食品科学
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生物工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROCESS BIOCHEMISTRY
·
2015
·
IF 2.516
Guohua Jing,Fujun Pan,Bihong Lv,Zuoming Zhou
Carbonic anhydrase (CA) is the most efficient catalyst for CO 2 hydration and dehydration. In the present work, magnetic polymer microspheres functionalized with epoxy group were prepared, and CA enzyme was immobilized on the carries by selective covalent binding. The parameters affecting CA immobilization, such as pH, temperature and enzyme dose were investigated. Based on the investigation and the characterization of the microspheres, the kinetic parameters of the immobilized and the free CA were also evaluated. The value of the Michaelis–Menten constant ( K m ) and the maximum velocity ( V max ) of the immobilized CA was 8.077 mmol/L (mM) and 0.027 μmol/(min mL), while that of the free CA was 6.091 mM and 0.091 μmol/(min mL), respectively. Moreover, the performance of the thermal stability, storage stability and reusability of the immobilized CA confirmed that CA immobilized on the epoxy-functionalized magnetic polymer microspheres owned a stable and efficient catalytic ability on CO 2 hydration, which seemed to be a suitable candidate for CO 2 capture.
研究领域:
生物化学
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环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2016
·Vol. 7
·期 48
·7400-7407
·
IF 5.687
Shengying Cai,Zhulin Weng,Yaochen Zheng,Bo Zhao,Zhengguo Gao,Chao Gao
Porous polymer microspheres have been widely used in various fields, such as in ion-adsorption and drug release, and as catalyst carriers and so on. However, the facile synthesis of polymer microspheres with various available functional groups is still a challenge. Here, we firstly synthesized epoxy-functionalized porous microspheres via thiol–yne suspension polymerization of glycidyl propargyl ether and 1,3-propanedithiol, using 1,7-octadiyne as a crosslinker and polyethylene glycol (PEG) as a porogen. The epoxy groups on the microsphere surfaces were further modified to tert-amine, thioacetate, and carboxyl groups via thiol–epoxy click reactions. The morphologies of the porous microspheres were investigated using a scanning electron microscope (SEM). When the content of PEG was 35 wt%, porous polymer microspheres with average diameters of ∼70 μm and highest porosities of 62.45% were obtained. Subsequently, diverse modified porous microspheres were used to adsorb copper ions that were dissolved in DMF. Among these as-prepared microspheres, the thioacetate-functionalized one exhibited the highest Cu2+ adsorption capacity (158 mg g−1) at room temperature. Exploration of its adsorption behaviors illustrated that the thioacetate-functionalized microspheres followed a chemically controlled monolayer adsorption mechanism. Our work presents a brand new reliable strategy for the synthesis and functionalization of non-degradable epoxy-containing porous microspheres, which can be used for the adsorption or removal of toxic metal ions (such as copper ions).
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 44
·49376
·
IF 2.52
Zhaoqi Niu,Dan Tian,Long Yan,Xiaoyan Ma,Chengshuang Zhang,Xiao Hou
3,13-Diglycidyloxypropyloctaphenyl double-decker silsesquioxane (EP-DDSQ) was synthesized by process of alkaline hydrolysis condensation of phenyltrimethoxysilane and corner capping reaction of methyldichlorosilane, followed by hydrosilylation with allyl glycidyl ether, and the resultant structure was confirmed by fourier transform infrared spectrometer (FTIR) and nuclear magnetic resonance (NMR), respectively. The thermosetting phenol-formaldehyde (PF) resin was then modified by EP-DDSQ, and the reactivity of PF resin with EP-DDSQ and thermal pyrolysis of modified cured resin were investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The surface morphologies of modified resins at high temperature were characterized with field emission scanning electron microscope (FESEM), and chemical structure of modified resins was analyzed through X-ray photoelectron spectrometer (XPS). The results showed that the appropriate addition of EP-DDSQ did not affect the curing temperature of the PF resin itself, but could improve the heat resistance of the system. When the amount of EP-DDSQ added was 10%, the initial degradation temperature of PF resin was increased by 49.31°C, and when the amount of EP-DDSQ added was 16%, the char yield of which was reached up to 61.39%, compared with that of pure PF resin (TGA 1,000°C of 57.62%) at Ar atmosphere. More importantly, the modified resin formed a regular and dense layer of SiC and SiO x ceramic on the surface after ablation in the muffle furnace at 800°C air atmosphere, which is very important for ablative resistant materials.
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
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Junyan Wang,Xin Yu,Jingjing Si,Xiaoyang Shao,Shuang Zhao,Gongying Ding
The compatibility of cold-mixed epoxy asphalt (CEA) significantly influences its mechanical properties, primarily mediated by the epoxy group content within CEA. However, the feasibility and mechanisms for regulating the external epoxy group content to achieve optimal performance have yet to be explored thoroughly. Herein, soybean oil, epoxidized soybean oil , and epoxy-terminated hyperbranched epoxy resin (EHER) were used to construct CEA with different external epoxy group contents, and their effects and mechanisms on the compatibility and mechanical properties of CEA were investigated based on experiments and molecular dynamics simulation. Our findings suggest that maintaining an external epoxy group content between 8.4%∼11.4% in the CEA blend and below 12.17% in the cured CEA is crucial. These criteria can be met by adding no more than 5 wt% EHER. CEA with 3 wt% EHER exhibited the most balanced compatibility and mechanical properties, characterized by a pot life of 91 min, a tensile strength of 5.02 MPa, an elongation at break of 61.3%, and a tensile toughness of 1.58 MJ/m 3 . The presence of external epoxy groups increased the cohesive energy density and the solubility parameter difference between epoxy resin and asphalt prior to curing, forming a "sea-island" structure with varying particle sizes, primarily comprising small-sized particles. This structure was preserved post-curing, establishing a stable system with minor energy alterations. Simultaneously, EHER enhanced the molecular rigidity and uniformity of CEA, thereby improving its mechanical properties. It is recommended to relate epoxy group content in CEA blends with indicators of compatibility and mechanical properties, enabling better prediction.
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）