ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Shan Gao,Tinghong Lu,Xiaohan Zhu,Fengli Yu,Bing Yuan
A catalytic system of Ru nanoparticles (NPs), Ru@SLSaq, dispersed in water was developed by employing sodium lignosulfonate (SLS) to reduce and stabilize ruthenium(III) cation heptaacetate (Ru3O(OAc)7) in an aqueous solution. This Ru@SLSaq catalytic system enabled the efficient hydrogenation of diphenylmethane (DPM) and o-hydroxydiphenylmethane (o-HDPM), yielding dicyclohexylmethane (DCHM) and perhydrofluorene (PHF), respectively. Characterization using UV–vis, FT-IR, Raman spectroscopy, HR-TEM, CO chemisorption, DLS, XRD, and XPS demonstrated that SLS effectively replaces the axial acetate ligands of Ru3O(OAc)7, reduces Ru in situ through the phenolic hydroxyls in its macromolecular structure, and maintains the stability of its core structure, thereby preventing the aggregation of generated Ru NPs. The obtained Ru NPs, predominantly in the Ru0 state with a Ru (100) lattice plane, were uniformly dispersed in the aqueous phase, exhibiting an average particle size of 2–3 nm. Ru@SLSaq displayed excellent catalytic activity for the hydrogenation of DPM and o-HDPM, achieving yields of 96.6% and 97.0% for DCHM and PHF, respectively, under mild conditions (n(substrate)/n(Ru) = 750, hydrogen pressure of 1.5 MPa, at 80 °C for 4 h). The calculated apparent activation energies (Ea) for the two reactions were found to be 46.5 kJ·mol–1 and 75.3 kJ·mol–1, respectively, and the catalytic system demonstrated good cycling stability. Experimental results, supported by DFT calculations, indicate that the complete hydrogenation processes of DPM and o-HDPM occur on the surface of Ru NPs via monophenyl ring adsorption, exhibiting small energy barrier differences across various pathways.
研究领域:
催化化学
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材料科学
·
绿色化学
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产品关联
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2024
·
IF 2.8
Xinyu Qin,Qing Duan,Yajun Wang,Junwei Cui,Ke Zhang,Shengshan Bi
Hydrogen (H 2 ), nitrogen (N 2 ) and carbon dioxide (CO 2 ) solubilities were measured at the temperature (313 to 363) K and the pressure (0.809 to 6.194) MPa. The reliability of the experimental system was verified by measuring the solubilities of N 2 in dodecane and CO 2 in decane at 344 K. The experimental data were fitted by empirical correlation x = ( a T 2 + b T + c ) ( d p 2 + e p + f ) , and the relative deviations between the experimental value and the literature value for the solubilities at given pressure and temperature were less than ±5 %. Under the same temperature and pressure conditions, the solubilities of the three gases in DPM is CO 2 > N 2 ≈ H 2 . Krichevsky- Kasarnovsky (K-K) equation was used to fit the experimental data. The absolute average relative deviation (AAD) between the experimental data of H 2 +DPM, N 2 +DPM and CO 2 +DPM systems and the calculated values of K-K equation are 1.21 %, 1.86 % and 0.88 %, respectively. In addition, the Henry constants of three gases dissolved in DPM were calculated, and the solution enthalpy, solution entropy, solution Gibbs free energy and solution specific heat capacity were calculated. H 2 and N 2 solubilities showed to be endothermic, while CO 2 showed the opposite trend.
研究领域:
化学工程
·
物理化学
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产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2024
·
IF 3.1
Ran L. J.,Wang X. P.,Yang Y. L.
The reinforcement of sulfur-crosslinked styrene butadiene rubber is of great importance. In this paper, styrene butadiene rubber with high modulus domains was prepared by a simple rubber processing process through the in situ reaction of epoxy resin and 4,4'-diaminodiphenylmethane (DDM), and satisfactory enhancement of mechanical properties was obtained. With the increase in epoxy resin from 5 to 15 phr, atomic force microscopy confirmed that the size of the dispersed phase increased from 400 nm ~ 1 μm to 750 nm ~ 2 μm, as well as the modulus increased from 90.1 to 279.3 MPa. Besides, the modulus of the SBR matrix was maintained at 11–15 MPa. It is proved that the dispersed phase forms a high modulus, low adhesion "domain" in the matrix. The 300% modulus, strength, and fracture toughness of the specimens significantly increased to 3.58, 6.34 MPa, and 17.41 MJ/m 3 , which are 2.50, 3.30, and 3.03 times higher than those of SBR, respectively, when the epoxy resin load was 15 phr. This strategy provides a cost-effective approach to obtain high strength rubber materials at high efficiency.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2024
·
IF 4.1
Lei Qian,Xiyu Song,Shuaijun Fang,Yu Wang,Hongfei Qian
We previously synthesized a group of carbamate-linked disazo disperse dyes that showed excellent fastness properties on polyester fabric by using the thermosol dyeing process. However, the color yield of the dyed fabric was not sufficiently high to be accepted by users, especially when using a high-temperature dyeing process. To further optimize the structures of disazo disperse dyes and observe the effect of the linking groups on the dyeing properties, in this work, we used p -phenylene diisocyanate or terephthaloyl chloride as crosslinking agents and aniline derivatives containing hydroxyl or amino groups as reactants to synthesize four disazo disperse dyes containing various characteristic groups, including ester, carbamate , amide , and urea groups. The structures of these new dyes were characterized by nuclear magnetic resonance, mass spectrometry , and Fourier-transform infrared spectroscopy analyses . The spectral properties in an N,N-dimethylformamide solvent were measured, the structural parameters of the dyes were calculated using the density functional theory method, and the dyeing properties were investigated by using high-temperature and thermosol dyeing processes, and also compared with these for the commercial dye, C·I.Disperse Red 153. The results showed that there were slight differences in the molar extinction coefficients and maximum absorbance wavelengths between the new dyes, but the effects of characteristic groups on the structural features and the dyeing properties of the new dyes were significant. The ester-linked dye (D1) had the highest color depth when a high-temperature process was used in the presence of 50 mL/L of methyl salicylate because of its highest ClogP (N-octanol/water partition coefficient) value, corresponding to its more hydrophobic nature, while all the other dyes produced lower color yields. When used in the thermosol dyeing process, the carbamate-linked dye (D2) yielded the highest color depth, followed by the ester-linked dye (D1) and amide-linked dye (D3), and the urea-linked dye (D4) produced the lowest color depth due to its highest hydrophilic properties. Finally, it was demonstrated that the new dyes had excellent color fastnesses except for the urea-linked dye (D4), which exhibited a slightly lower light fastness, While the commercial dye used as the control showed a relatively poor sublimation and light fastness although its color depth and chroma value performed slightly better than the new dyes as used by the thermosol dyeing process.
研究领域:
化学工程
·
材料科学
·
纺织科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Chengyu Yang,Weixing Xu,Yang Nan,Yiguang Wang,Xianhong Chen
Membrane separation processes constitute an economical and efficient technology for the effective treatment of dye wastewater. In this study, 4,4′-diaminodiphenylmethane and 1,3,5-benzenetricarbonyl trichloride were used as monomers to prepare polyamide-based nanofiltration (NF) membranes by interfacial polymerization, for dye removal. The preparation parameters of the NF membrane were optimized by investigating the effects of the concentrations of two monomers, the soaking time of the carrier in aqueous solution of monomer, and the polymerization time on the membrane performance. The surface roughness of optimized membrane was found to be only 5.08 nm, and the stabilized contact angle was about 25°, indicating very high hydrophilicity. When the pH was in the range from 3 to 10, the membrane surface became electronegative, which resulted in a high rejection rate toward various negatively charged dyes. For the congo red dye solution, the membrane showed a flux of 36.81 L m −2 h −1 and a rejection rate of 99%. The rejection rate of the other two negatively charged dyes investigated herein was also above 95%. Moreover, the filtration experiment of bovine serum albumin solution showed that the flux recovery rate of the membrane was up to 89.85%, indicating good stability and antifouling performance.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2022
·
IF 6.057
Zhongtao Chen,Fangjun Ye,Tianyin Shao,Yeping Wu,Mao Chen,Yinyu Zhang,Xiuli Zhao,Bo Zou,Yuguo Ma
Mechanochromic polymers exhibit potential applications in damage reporting and stress sensing. Despite the rapid progress achieved in recent years, mechanochromic structural polymers, such as epoxy thermosets, remain difficult to develop, let alone structural materials that can distinguish different levels of stress by a visual color change. This work presents a new class of multicolor mechanochromic epoxy thermosets that can discriminate between low and high compressive stresses via the incorporation of two distinct mechanophores. Amino-functionalized rhodamine (Rh) moieties serve as efficient curing agents and ratiometric stress sensors for epoxy thermosets. The Rh mechanophore in the epoxy network can be activated either by scratch or uniaxial compression, showing a reversible color change and a red fluorescence turn-on response. A stress-dependent multicolor response under uniaxial compression and hydrostatic pressure is achieved by the combination of Rh mechanophores with a commercial epoxy resin containing a 4,4′-diaminodiphenylmethane (DDM) framework. The Rh zwitterion formed at a low compressive stress turns the sample red, while a high compressive stress turns the sample green via the formation of the quinoidal methine form of DDM. Differential activation under varying degrees of compressive stress is demonstrated by UV–vis spectroscopy. The facile preparation and ability to recognize stress intensity by the naked eye make this strategy suitable for practical applications.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2015
·
IF 2.037
Yijie Deng,Li Xu,Xiaobo Sun,Liang Cheng,Guoji Liu
In this experiment, the solubility data of 4,4′-diaminodiphenylmethane in different pure solvents, including methanol, ethanol, 2-propanol, 1-butanol, toluene, chloroform, and benzene, were measured by a synthetic method from (293.15 to 333.15) K at atmospheric pressure. It is indicated that the solubility of 4,4′-diaminodiphenylmethane in each solvent increases with increasing temperature. The modified Apelblat, λh, and van’t Hoff equations were employed to correlate experimental solubility data, and each selected correlation equation could give a good fitting result of the relationship between solubility and temperature. The modified Apelblat equation shows the best agreement, in general. Furthermore, the standard molar enthalpy, standard molar Gibbs energy, and standard molar entropy of 4,4′-diaminodiphenylmethane in the dissolution process were calculated based on the van’t Hoff analysis and Gibbs equation.
研究领域:
物理化学
·
热力学
·
化工
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产品关联
DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Xinxin Fang,Xin Guo,Weilin Tang,Qun Gu,Yue Wu,Hua Sun,Junfei Gao
In this work, a bio-based epoxy resin, protocatechuic acid diester epoxy resin, (PDEP), was synthesized using protocatechuic acid. The structure and properties of PDEP have been characterized by 1H NMR, 13C NMR, and Fourier transform infrared. After different contents of PDEP were added to diglycidyl ether of bisphenol A (DGEBA), the modified epoxy resins were cured by 4,4′-diaminodiphenylmethane (DDM). With the addition of a flexible long-chain bio-based monomer to improve toughness, the impact strength was 50 kJ·m–2 with only 5.0 wt % PDEP; compared with pure DGEBA, the impact strength was 27 kJ·m–2. Further, an increase in Tg should be confirmed from the mechanical cross-linking density and rigidity group content. The single Tg proved the homogeneous phase structure of the PDEP-cured resin. Morphology exhibiting the ductile fracture of the cured resin was confirmed by scanning electron microscopy. Overall, this work demonstrates the utilization of renewable protocatechuic acid as an effective modifier for epoxy resin, which reflects its potential application.
研究领域:
材料科学
·
高分子化学
·
可持续材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 14
·8559-8568
·
IF 4.036
Wei-Hua Xu,Shi-Jing Yan,Jian-Qing Zhao
Polyhedral oligomeric silsesquioxane (POSS) and a highly effective 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO)-based flame retardant co-curing agent (D-bp) were chemically introduced into the 4,4′-diaminodiphenyl methane (DDM)/diglycidyl ether of bisphenol A (DGEBA) epoxy system to create organic–inorganic hybrid epoxy composites with simultaneously improved flame retardancy and mechanical properties. The results revealed that POSS/D-bp/DGEBA hybrid composites exhibited excellent comprehensive performance, in which the V-0 criterion of the UL-94 test was passed and the peak of heat release rate (P-HRR) was significantly decreased from 939 to 371 kW m−2 when the phosphorus content was only 0.25 wt%. The glass transition temperature (Tg) increased by 16.2 °C and obvious improvement in the mechanical properties was also evidenced.
研究领域:
材料科学
·
化学工程
·
高分子科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER BULLETIN
·
2022
·Vol. 80
·期 2
·1873-1891
·
IF 2.843
Shi Wenshuo,Wei Kun,Fan Yuzhe,Wang Xiaoqing,Shi Jiahao,Wang Sifan,Cheng Peng
Transition temperature is significant in determining applications of phase change materials. In this paper, PEG2000 and PEG4000 were used as soft segments and MDI and 3,3ʹ-Dichloro-4,4ʹ-diaminodiphenylmethane (MOCA) were used as hard segments. Several polyurethane solid–solid phase change materials (PUSSPCMs) were synthesized by adjusting the mass ratio of PEG4000 and PEG2000. Based on the differential scanning calorimeter test, this paper studied the relationship between the mass ratio of PEG2000 and the phase transition temperature. The influence mechanism of phase change temperature was revealed from molecular structure, crystallization properties, and surface morphology. Furthermore, PUSSPCMs were tested for leakage and the thermal stability. The results showed that the synthesized PUSSPCMs had no liquid leakage during the heating process. There was a good linear relationship between the mass ratio of PEG2000 and phase transition temperature. The thermal decomposition onset temperature was above 230 °C.
研究领域:
材料科学
·
化学工程
·
热能存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Jiawei Liu,Qingyi Zeng,Huirui Lei,Kaiyuan Xin,Anming Xu,Ren Wei,Ding Li,Jie Zhou,Weiliang Dong,Min Jiang
Microorganisms capable of decomposing polyurethane (PU) and other plastics have the potential to be used in bio-recycling processes. In this study, 20 PU-degrading strains were isolated, including 11 bacteria and 9 fungi, using a synthesized poly(1,4-butylene adipate)-based PU (PBA-PU) as the screening substrate. Three PU substrates with increasing structure complexities were used for a thorough evaluation of microbial degradation capacity: Impranil® DLN-SD, PBA-PU film and PU foam waste. After 4 days, the best fungal PBA-PU degrader, Cladosporium sp. P7, could degrade 94.5% of Impranil® DLN-SD. After 28 days of cultivation, 32.42% and 43.91% of solid PBA-PU film was converted into soluble small molecules when used as the sole carbon source or in a medium with other co-carbon sources, respectively. Accordingly, the weight loss of PU foam waste after 15 days was 15.3% for the sole carbon condition and 83.83% for the co-carbon conditions. Furthermore, PBA-PU was used for metabolic pathway analysis because of its known composition and chemical structure. Six metabolites were identified during the degradation process of PBA-PU, including adipic acid (AA), 1,4-butanediol (BDO), and 4,4’-methylenedianiline (MDA), which can also be used as the sole carbon source to grow the fungal strain P7, resulting in the discovery of two MDA metabolites during the cultivation processes. Based on the presence of these eight metabolites, we hypothesized that PBA-PU is first depolymerized by the fungal strain P7 via ester and urethane bond hydrolysis , followed by intracellular metabolism and mineralization of the three monomers to CO 2 and H 2 O.
研究领域:
环境科学
·
微生物学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2023
·
IF 5.1
Xiangkai Zhang,Zhimin Wang,Jianqiang Xie
A novel fluorinated diamine curing agent (AFPCO) was synthesized from natural isoflavone daidzein , used to cure hydrogenated epoxy resin (DGEHBPA) and tested against commercially available DGEHBPA cured with 4,4′-diaminodiphenylmethane (DDM). The results show that the non-isothermal curing reaction kinetics study found AFPCO to be less reactive than DDM. Compared to DDM, the AFPCO cured material increases the energy storage modulus , impact strength and flexural strength by 34%, 51% and 12% respectively. The AFPCO cured material performs worse in terms of decomposition temperature , but the residual carbon rate exceeds that of DDM/DGEHBPA by 230% and the flame retardancy reaches VL-94 V-1 level. In contrast to the hydrophilic nature of the material after DDM curing, the introduction of fluorine in AFPCO gives the material a water contact angle of 92.19°, which meets the criteria for hydrophobic materials. In contrast to low dielectric constant resins prepared with conventional fluorinated curing agents, AFPCO/DGEHBPA has a high dielectric constant , but still exhibits a low numerical value of 0.0338 in dielectric loss.
研究领域:
材料科学
·
化学工程
·
高分子化学
✓ 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）