MACROMOLECULES
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2022
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IF 6.057
Hongzhi Liu,Ning Chen,Changqing Peng,Shuai Zhang,Tuan Liu,Pingan Song,Guolun Zhong,Hao Liu
The toughening of poly(lactic acid) (PLA) often involves the use of nonbiodegradable or petrochemical elastomers owing to the lack of effective renewable alternatives and facile routes to tailor desirable morphologies. In this work, we developed a facile and universal dynamic vulcanization strategy of dual monomers to fabricate mechanically robust PLA blends. By increasing NCO/COOH equivalent ratios between l-lysine diisocyanate (LDI) and hydrogenated dimer acid (HDA) (i.e., nNCO,LDI/nCOOH,HDA) above 1.0:1, the phase structure of the resulting PLA blends transformed from the common “sea-island” morphology to partially or fully co-continuous ones. The extraordinary impact toughness (the maximum impact strength up to 109.8 kJ m–2) in combination with the balanced strength and stiffness was attributed to a continuous biopolyamide elastomer (HDAPA) with the simultaneous improvement in both the cross-linking level and interfacial compatibilization. Atomic force microscopy (AFM)-based nanomechanical mapping results suggested that the cross-linking of HDAPA domains gradually prevailed from the boundaries into the whole domains with the elevated nNCO,LDI/nCOOH,HDA ratios. The mechanisms regarding multiple reactions and co-continuity development at an ultralow concentration of the minor HDAPA phase were elucidated. Intriguingly, the enhanced clustering-triggered emission was observed for the PLA/HDAPA blends with a fully co-continuous structure.
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POLYMERS FOR ADVANCED TECHNOLOGIES
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2022
·Vol. 34
·期 1
·181-194
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IF 3.348
Yang Yang,Caili Zhang,Yu Han,Yunxuan Weng
Poly(vinyl chloride) (PVC) is a widely used plastics in different industries. It is an intrinsically hard and brittle polymer and requires the use of plasticizers to improve the processability. Commonly used phthalate-based plasticizers have serious toxicity issues and we present alternatives based on epoxidized soybean oil (ESO) and epoxidized cardanol esters (ECEs). ECEs are synthesized from cardanol and three fatty acids (oleic, ricinoleic, and myristic) using 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) as a coupling agent. Their structure and purity are confirmed by Fourier transform infrared spectroscopy (FTIR) and Nuclear magnetic resonance. Moreover, plasticized PVC films are prepared using a solvent-free method. The replacement of 10 phr of ESO with 5 phr of ECE improves the plasticizing power due to the co-solvency effect. Mechanical properties and thermal stability of plasticized PVC films are correlated with the chain length and the number of epoxy groups in ECE. The best plasticizing effect is observed for epoxidized cardanol-myristate (ECD-MA). ECD-MA as a shorter-chain secondary plasticizer is more compatible with ESO and allows higher conformational mobility of PVC chains. PVC/30ESO/5ECD-MA polymer exhibits an exceptionally high initial thermal decomposition temperature (314.4°C) while preserving moderate ductility and tensile strength (263.4% and 23.3 MPa). Overall, this study highlights the potential applicability of ECD-MA in combination with ESO as a sustainable, bio-based plasticizer and heat stabilizer for flexible PVC products.
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JOURNAL OF LUMINESCENCE
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2022
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IF 4.171
Fengchang Huang,Xiaoming Mo,Xuesong Li,Maolan Peng,Yulu Zhou,Xiaoma Tao,Yifang Ouyang,Jialong Zhao
Lead-free copper(I)-based halides have attracted tremendous attentions in producing optoelectronic devices due to their outstanding optical properties and low-cost synthesis. However, the low efficiency of copper(I)-based halides in the long-wavelength visible emissions (typically yellow- or red-light emissions) has hindered the use of such non-toxic halides in full-color displays and solid-state lighting applications. In this work, lead-free, air-stable and yellow-light emissive CsCu 2 I 3 microplatelets (MPs) with well-defined smooth surface were synthesized by a one-pot anti-solvent solution method at room temperature via surface functionalization with different long-chain surfactants . The results suggested that oleic acid (OA) was the most favorable surfactant for the CsCu 2 I 3 MPs with the best performance. Photoluminescence quantum efficiency of the yellow-emissive CsCu 2 I 3 MPs (centered at 580 nm) was dramatically enhanced fourfold by coordinating OA ligands during the synthesis to eliminate the surface pinholes of the CsCu 2 I 3 MPs. Notably, the CsCu 2 I 3 MPs showed ultra-high stability towards exposure of ambient air over 50 days. These findings may open new directions to synthetize high-efficiency copper(I)-based halides that generate long-wavelength visible emissions for lead-free nontoxic full-color optoelectronic devices.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Yuehong Zhang,Chenyang Liu,Jianzhong Ma,Wenbo Zhang,Qianqian Fan,Zhonglei Ma
Herein, hydroxylated, aminated, and carboxylated ricinoleic acids (RA-OH, RA-NH2, RA-COOH) are individually prepared via facile and efficient thiol–ene click reactions with renewable ricinoleic acid and commercially available sulfhydryl compounds as raw materials. The resulting modified ricinoleic acids are subsequently used as natural oils to prepare environmentally friendly fatliquors for automotive interior leather of a low fogging value. Further, the influence of the molecular structure of the three modified ricinoleic acids on the fogging value and free grease content of the fatliquored leather is systematically studied by molecular dynamics simulation theoretical predictions and regular experimental characterization. The introduction of −OH, −NH2, and −COOH to ricinoleic acid can increase its ability to form strong intermolecular interactions with leather collagen fibers, as confirmed by the Ebinding values from molecular dynamics simulations. The interaction strength of modified ricinoleic acids and leather collagen is in the order RA-OH > RA-COOH > RA-NH2 > RA, leading to a low migration rate of modified ricinoleic acids and an obvious lubricating effect on the collagen fibers. Among them, RA-OH shows the strongest intermolecular interaction with leather collagen and is difficult to migrate from the collagen matrix; thus, the RA-OH fatliquored leather exhibits the lowest fogging value of 6.38 mg, the lowest free grease content of 12.36%, and excellent softness and physical and mechanical properties. Overall, a combination of renewable ricinoleic acids with “green” thiol–ene click reactions provides a new strategy for the preparation of sustainable fatliquors for automotive interior leather of a low fogging value, and the wastewater after fatliquoring is also biodegradable, all of which contribute to the sustainable development of the fatliquors in the leather industry.
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THERMOCHIMICA ACTA
·
2021
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IF 3.115
Baozhong Zhu,Weiqi Chen,Yunlan Sun,Peng Guo,Jianzhong Liu
Nanofluid fuels can be used in scramjet . However, the interactions among fuel droplets in spray and combustion process are still a gray area. The study on the evaporation and combustion of the double droplets can better demonstrate the role of nanofluid droplets. In this paper, the evaporation and combustion characteristics of the double droplets of aluminum/n-heptane based nanofluid fuels were investigated by a droplet-suspension method, whose results were compared to those of the single droplet at 973 K and 0.1 MPa. The effect of the distance of the double droplets on their evaporation behavior, ignition delay time, combustion phenomena, and micro-explosion time were studied. The influence of thermocouple wire was also analyzed. The double droplets have a synergistic effect on the evaporation behavior, ignition delay time, and micro-explosion. The ignition delay time of double droplets of the aluminum/n-heptane based nanofluid fuel droplet has debased 25.3% compared with that of the single droplet, while the maximum micro-explosion duration has increased 7.2%. With the increase of the distance of both droplets, the synergistic effect is first strengthened and then weakened.
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高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 7
·4211-4222
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IF 5.044
Lin Yamei,Li Mei,Xia Jianling,Ding Haiyang,Xu Lina,Yang Xiaohua,Li Shouhai
Abstract Polyols with different number of hydroxyl groups were synthesized from ricinoleic acid and oleic acid. These plant oil derived polyols can be used as plasticizers and combined with ethyl cellulose (EC) through supramolecular system to prepare ethyl cellulose composite films. The morphology, thermal stability and mechanical properties of the prepared ethyl cellulose films were studied in detail to indicate the plasticizing efficiency of these polyols and the effect of the number of hydroxyl groups in polyols on EC composite film’s properties. With the addition of polyols, the tensile strength of EC composite films decreased, while the elongation at break increased. The elongation at break of EC composite films can be improved by 11–12 times when the polyols contain 1–3 hydroxyl groups. Thus, the plant oil derived polyols with 1–3 hydroxyl groups can be used as plasticizers for EC films. In addition, molecular dynamic simulations were performed to further probe the effects of the number of hydroxyl groups in polyols on EC composite film’s properties. Graphic abstract
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JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH
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2022
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IF 1.61
Wei-Wei Ye,Xiang-Ying Meng,Qian Zhao,Jian-Yang Chen,Cong Liu,Feng Chen,Yong Zhou,Yi Wang
Echinacoside (ECH) is the main compound of Cistanche deserticola, which possesses antioxidant, antitumor, antifatigue, and anti-inflammatory properties. The present study investigated the protective effects of echinacoside on type 2 diabetes mellitus (T2DM)-induced injury in T2DM injury db/db mice model and insulin-resistant LO2 cell model. The results demonstrated that ECH probably alleviated T2DM-induced injury by mediating the AKT pathway, which provided a new direction for the treatment of T2DM-induced injury.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
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IF 6.7
Yuanchuan Ma,Jiao Wei,Jialong Zhu,Yang Hu,Yuquan Cai,Jieyuan Zheng,Hong Fan
It remains a challenge to explore a low-cost and green approach to prepare stimuli-responsive materials that can meet increasingly complicated separation demands. Herein, we report a facile method to prepare pH-responsive silica particles modified by abundant carboxyl groups (SiO 2 -COOH), which are introduced from bio-based ricinoleic acid via an efficient and mild thiol-ene click reaction. The hierarchical structure of SiO 2 -COOH can easily construct roughness that is essential for special wettability, which is demonstrated by the robust superhydrophobicity achieved synergistically with non-pH-responsive binder on different substrates and no significant change after 100 peels or extrusions. We also present the efficient separation of different oil–water mixtures by modified fabrics and sponges, respectively, based on their fast wettability transition within seconds at different pH. More importantly, benefiting from the chelation of carboxyl and hydroxyl groups from ricinoleic acid molecules and large specific surface area provided by the hierarchical structure, SiO 2 -COOH and its different alkali treatment products exhibit outstanding adsorption capacity to heavy metal ions and organic dyes, of which up to 180 mg/g for Pb 2+ . It is believed that the proposed novel and eco-friendly method is a promising candidate for the simultaneous removal of multiple pollutants from oily wastewater.
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高影响因子
PROCESS BIOCHEMISTRY
·
2023
·
IF 4.4
Meng Zhang,QingYan Li,Feiyu Fan,Fuping Lu,XueLi Zhang
This study highlights an effective strategy based on the synergistic complementarity of metabolic engineering and adaptive evolution.First, the chassis strain YL013 was obtained by deleting five acyl-CoA oxidase genes to reduce the degradation of γ-decalactone(GDL). Then, adaptive laboratory evolution with increasing concentrations of γ-decalactone was employed to obtain the strain YL013–250 with increased γ-decalactone tolerance of up to 250 mg/L. Moreover, this strain produced 664.5 mg/L γ-decalactone, representing a 142 % improvement over the parental strain YL013. Furthermore, four candidate fatty acyl-CoA synthetase genes, FAA1 , FAA2 FAA3 and FAT1, were modulated using the strong, constitutive TEFin promoter to investigate their roles in GDL production. The results showed that overexpression of FAA1 , FAA2 and FAA3 can effectively improve the ability of Yarrowia lipolytica to synthesize GDL using ricinoleic acid as substrate, among which overexpression of FAA1 had the most significant effect on GDL yield. Finally, gene of alcohol acyltransferase ( AAT1 ) from Prunus persica was introduced into Y. lipolytica , leading to a GDL titer of 2.2 g/L, which was a 1.32-fold increase compared with the parental strain without AAT1 . Taken together, this study provides a combinatorial strategy to improve GDL production through rational regulation of pathway genes and non-rational adaptive laboratory evolution.
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POLYMER ENGINEERING AND SCIENCE
·
2023
·Vol. 63
·期 5
·1507-1515
·
IF 3.2
Heng Li,Fang-Yu Ren,Hong-Ru Li,Liang-Nian He
Biomass-based polymers and their property regulation using functional materials have attracted much interest. In this work, ricinoleic acid-derived cyclic carbonate was prepared and applied to the synthesis of nonisocyanate polyurethane (NIPU) with aliphatic diamine, in which octa(aminopropyl) polyhedral oligomeric silsesquioxane (OAP-POSS) was incorporated as polyamine to partially or totally substitutes for the diamine to introduce POSS units into the polymer thus regulating the properties of the resultant material. In the curing process, Fourier transform infrared spectroscopy (FT-IR) was used to track the reaction and curing at 50°C for 12 h was found to be sufficient for the polymerization. A series of POSS modified NIPUs were obtained by altering the molar fraction of OAP-POSS in total amine components and the material with the highest thermal stability, shore hardness and water resistance was accessed with 100% substitution of OAP-POSS for diamine.
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高影响因子
International Journal of Mining Science and Technology
·
2023
·
IF 11.8
Fen Xu,Shiwei Wang,Rongjie Kong,Chengyong Wang
The utilization of an appropriate collector or surfactant is crucial for the beneficiation of low-rank coal. However, in previous studies, the selection of surfactants was primarily based on flotation procedures, which hinders the understanding of the interaction mechanism between surfactant groups and oxygen-containing functional groups at the surface of low-rank coal. In this study, we investigate the flotation of low-rank coal in the presence of a composite collector by using a combined theoretical and experimental approach. The maximum flotation mass recovery achieved was 82.89% using a 3:1 mixture of dodecane and castor oil acid. Fourier-transform infrared and X-ray photoelectron spectroscopic analyses showed that castor oil acid was effectively adsorbed onto the surface of low-rank coal, enhancing the hydrophobicity of the coal. In addition, the diffusion coefficient of water molecules in the water-composite collector-coal system was greater than that in the dodecane system. Moreover, due to the presence of castor oil acid in the flotation process, the adsorption distance of dodecane and low-rank coal became shorter. Molecular dynamics simulations revealed that the diffusion and interaction of surfactant molecules at the interface of low-rank coal particles and water was enhanced because the adsorption of the dodecane-castor oil acid mixture is primarily controlled by hydrogen bonds and electrostatic attraction. Based on these results, a better surfactant for flotation of low-rank coal is also proposed.
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高影响因子
POLYMER TESTING
·
2019
·
IF 2.943
Haifei Zhang,Fengfan Zhu,Qinghe Fu,Xiaoxiang Zhang,Xinbao Zhu
Expoxy acylated ricinoleic acid binary alcohol ether ester (EARABAEE) is a kind of novel bio-based environmental-friendly plasticizer . EARABAE was synthesized from ricinoleic acid and binary alcohol ether and it's chemical structure was characterized by FT-IR, 1 H NMR, ESI-TOF-MS. EARABAEE was mixed with the poly(vinyl chloride) (PVC) and mechanical property was investigated. The static mechanical property tests indicated that the PVC film plasticized by epoxy benzoylated ricinoleic acid ethylene glycol butyl ether ester (2c) has better tensile strength and the film plasticized by epoxy acetylated ricinoleic acid propylene glycol methyl ether ester (3d) has higher elongation at break. The dynamic mechanical property was evaluated by balanceable torque and mixing process energy, Haake rheometer tests showed that the 3d-plasticized PVC film has bigger balanceable torque and mixing process energy. In addition, the proportion of 3d and DOTP markedly affected the dynamic mechanical property. When the 3d content was more than 25%, the balanceable torque and mixing process energy decreased significantly with the 3d content increased.
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高影响因子
危险品化学品经营许可证（带存储）