ACS Catalysis
·
2025
·
IF 13.1
Xiaorui Du,Chongshuai Gao,Jiaxin Huang,Yanbin Cui,Shijun Liu,Chenguang Wang
Controlling both the hydrogenation performance and the activation of Schiff base intermediate in catalysts is crucial for attaining high slectivity toward primary amine in the reduction amination of furfural. However, it remains pending for Pt-based catalysts, on which the reduction amination reactions rarely generate primary amines so far. In this work, we developed a Pt/TiO2 nanocluster (NC) catalyst with a size distribution independent of the reduction temperature and loading amount. The reductive amination performance was investigated by regulating the surface electronic state and the distance between Pt NCs, and the results, attractively, revealed that the catalyst with a lower loading amount exhibited a higher furfurylamine (FAM) yield. Further studies unraveled that the catalyst with a larger Pt NC proximity had more abundant effective adsorption sites for the key intermediate Schiff base, i.e., the surface Ti4+ sites adjacent to the Pt NC, promoting the transformation of the Schiff base. Meanwhile, reducing the surface density of Pt NCs helped control the intensity of hydrogen spillover, thereby inhibiting the occurrence of overhydrogenation reactions. Optimal activity for primary amine generation from furfural reductive amination was achieved with a Pt NC catalyst reduced at 500 °C and with a loading amount of only 0.1 wt %, resulting in a FAM yield exceeding 93% and a production rate of 297.9 gFAM gPt h–1. The reaction mechanism, involving the competitive relationship between NH3 and H2, was elucidated through kinetic studies and theoretical calculations. This work provides insights for the designation of catalysts with controllable hydrogenation activity and adsorption selectivity and contributes to the understanding of the mechanism of the reductive amination reaction.
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高影响因子
POLYMER DEGRADATION AND STABILITY
·
2024
·
IF 6.3
Yin Lu,Yi Yang,Jiaqi Wang,Yichen Jing,Kan Zhang
In response to safety and environmental concerns, there has been a significant increase in research focused on developing high-performance thermoset materials from sustainable sources. In this study, a sophisticated chemical design approach integrates coumarin and furan moieties into a bio-based UV-dimerizable benzoxazine resin. The newly obtained bio-benzoxazine exhibits a reduced curing temperature along with improvements in both thermal stability and flame-retardant properties compared to conventional thermosetting counterparts. Extensive characterization of the chemical structure of the UV-dimerizable bio-based benzoxazine is conducted through nuclear magnetic resonance, Fourier transform infrared spectroscopy, elemental analysis, and high-resolution mass spectrometry. The photo-dimerization processes are monitored using UV–Vis and NMR techniques. Additionally, the thermally activated curing behavior is scrutinized via differential scanning calorimetry and in situ FT-IR techniques. Remarkably, the fully polymerized bio-thermoset demonstrates exceptional thermal stability, possessing a T d10 of 410 °C and a T g of 283 °C. Moreover, the resulting thermosets also shows very low flammability, as evidenced by a heat release capacity of 14.6 J·g -1 ·K -1 and a total heat release of 2.97 kJ·g -1 . This study not only outlines a method to enhance the overall performance of bio-polybenzoxazines but also provides a direct and sustainable synthesis route for bio-derived, intrinsically non-flammable thermosetting materials.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Yongli Shi,Suyue Xu,Jingya Zhao,Huiqing Zhu,Xiaofei Pan,Bingqian Zhao,Zeyu Sun,Na Li,Xueyan Hou
The objective of this study was to develop an injectable hydrogel based on furfuryl amine-conjugated hyaluronic acid (FA- conj -HA) and evaluate the in vivo anti-4 T1 tumor activity of doxorubicin-loaded hydrogel (DOX@FA- conj -HA gel ). The cargo-free hydrogel (FA- conj -HA gel ) was fabricated through a Diels-Alder reaction at 37 °C with FA- conj -HA as a gel material and four armed poly(ethylene glycol)2000-maleimide (4-arm-PEG2000-Mal) as a cross-linker. The bio-safety of FA- conj -HA gel were assessed, and the in vivo antitumor activity of DOX@FA- conj -HA gel was also investigated. Many 3D network structures were observed from scanning electron microscope (SEM) photograph, confirming the successful preparation of FA- conj -HA gel . The absence of cytotoxicity from FA- conj -HA gel was proved by the high viability of 4 T1 cells. In vivo bio-safety studies suggested that the obtained FA- conj -HA gel did not induce acute toxicity or other lesions in treated mice, confirming its high bio-safety. The reduced tumor volumes, hematoxylin-eosin staining (H&E), and TdT-mediated dUTP-biotin nick end labeling (TUNEL) analysis indicated the potent in vivo anti-4 T1 tumor effects of DOX@FA- conj -HA gel . In conclusion, the favorable bio-safety and potent antitumor activity of DOX@FA- conj -HA gel highlighted its potential application in oncological therapy.
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PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Ruiyu Yuan,Yi Yang,Zhenhao Yao,Kan Zhang
In this study, we used vanillin and furfurylamine from renewable resources as starting materials and successfully synthesized an innovative derivative of bisbenzoxazine (MH-fa) using the Mannich reaction. We characterized the chemical structure of the newly synthesized bisbenzoxazine compound using high-resolution mass spectrometry (HR-MS) technology. The results of nuclear magnetic resonance spectroscopy (NMR) and Fourier transform infrared spectroscopy analysis (FT-IR) confirmed the successful synthesis of the target compound. The synthesis of the benzoxazine copolymer (MH-fa-co-DDM-BMI) was achieved by leveraging the reversibility of the Diels–Alder reaction between the MH-fa monomer and 4,4′-bismaleimide diphenylmethane (DDM-BMI). In addition, the investigation into the polymerization behavior of benzoxazine monomer and its corresponding main-chain copolymer was conducted employing differential scanning calorimetry (DSC) along with in situ FT-IR. We studied the thermal stability and combustion performance of two samples using thermogravimetric analysis (TGA) and microscale combustion calorimetry (MCC). The results revealed that the bio-based bisbenzoxazine exhibited excellent heat resistance and flame retardancy. Specifically, poly(MH-fa) exhibits a T d10 value of 350°C and a Y c value of 62.3% at 800°C. Furthermore, the material exhibits an extremely low heat release rate (20.4 J g −1 K −1 ), highlighting its potential applications in the field of high-efficiency flame retardant materials.
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高影响因子
GREEN CHEMISTRY
·
2024
·
IF 9.3
Hao-Xin Niu,Tian-Mo Yang,Xin Wang,Ping Zhang,Wenwen Guo,Lei Song,Yuan Hu
Epoxy thermosets are used in many fields because of their outstanding properties. However, commercial epoxy thermosets are flammable, so epoxy resins with excellent flame retardant properties need to be prepared. In recent years, carbon fiber epoxy composites have been widely used in aerospace and other high-tech fields due to their high strength and excellent performance. With the increased use of carbon fiber epoxy composites, the recycling of carbon fibers is an important issue. Herein, a bio-based epoxy vitrimer (TVEP/DFDA) containing a Schiff base structure was successfully prepared by utilizing vanillin, tyramine and furfurylamine. Moreover, carbon fiber epoxy composites (CF-TVEP/DFDA) were successfully prepared. The TVEP/DFDA composite has better mechanical properties than DGEBA/DDM and excellent flame-retardant performance. The limiting oxygen index (LOI) of TVEP/DFDA was 28.5%, and TVEP/DFDA achieved a UL-94 V-0 rating. Heat hazards and smoke hazards are sources of danger in fires. According to the cone calorimetry test, compared with those of DGEBA/DDM, the heat release rate, total heat release and total smoke production of TVEP/DFDA decreased by 73.9%, 52.6% and 56.6%, respectively. The significantly reduced heat and smoke production indicate that TVEP/DFDA has a lower combustion intensity and better fire safety than DGEBA/DDM. CF-TVEP/DFDA also exhibited excellent flame-retardant performance, with a high LOI of up to 45% and a UL-94 V-0 rating. However, the CF-DGEBA/DDM cannot pass the vertical burning test. TVEP/DFDA has excellent stability under different solvents and can be degraded under acidic conditions. This work describes a strategy for recycling carbon fibers by immersion in a hydrochloric acid solution. The recycled carbon fibers exhibit surface morphologies, chemical structures and mechanical properties similar to those of virgin carbon fibers.
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POLYMER
·
2024
·
IF 4.1
Naipin Chen,Fang Wang,Jiajun Wang,Jiaqi Liu,Xinbao Zhu
It has been urgent that timely repair of microdamage generated during long-term service of metal insulation coatings. Hereby, we developed a novel self-healing dual-chamber microcapsule with particle size about 5 μm, in which furfuryl amine modified polystyrene-acrylic acid (PSAF) as shell material and photosensitizer Carbon dots (CDs) as Pickering emulsifier. The synthesized materials were characterized analytically, FTIR and DSC demonstrated the simultaneously existence of healing agent and curing agent in the resultant dual-chamber microcapsule. Experiments also showed microcapsules exhibited satisfying storage stability more than 20 d at room temperature as well as thermogenesis effect that allowing temperature of epoxy composite materials raised to 50 °C in 60s and fractures to be effectively minimized in time. The scratch tensile measurement results demonstrated that epoxy resin composites incorporated with 2 wt% microcapsules exhibited the optimal strength self-healing efficiency, modulus, toughness and anti-fatigue performance. Furthermore, surface characterization and EIS analysis also confirmed the long-lasting healing effect of EP/MC 2% complex coating with outstanding corrosion resistance . Therefore, the photothermal responsive dual-chamber microcapsule designed in this work has application as self-healing material especially epoxy anti-corrosion coating.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Rui Yang,Richie Yang,Shengfu Yang,Kan Zhang
Producing thermosetting polymers using natural renewable resources has attracted great attention due to the requirement of sustainable development for human beings. Herein, we represent our design of a novel biobased thermosetting resin (KAE-fa) containing a polymerizable oxazine ring and a furan group derived from renewable kaempferol and furfurylamine. The distinctive presence of rich intra- and intermolecular hydrogen bonds within KAE-fa imparts it with thermal latent polymerization characteristic, long shelf life, and exceptional high performance of its resulting polybenzoxazine. Notably, the resulting thermoset, poly(KAE-fa), demonstrates a substantially high glass transition temperature (Tg) of 304 °C, an impressively elevated char yield (in N2) of 63%, and an extraordinarily low heat release capacity of 10.12 J·g–1·K–1. In addition, KAE-fa has also been utilized to fabricate a carbon fiber-reinforced composite [CF/poly(KAE-fa)]. Employing this newly obtained high-performance bioresin as the matrix, CF/poly(KAE-fa) exhibits a remarkable property enhancement. For instance, CF/poly(KAE-fa) shows 108, 28, and 82.7% increases in Tg, tensile strength, and Young’s modules (room temperature), respectively, compared with the carbon fiber-reinforced BA-a composite [CF/poly(BA-a)]. These advantages underscore the great potential of using renewable bioresins for developing both high-performance thermosets and composites with key applications spanning from transportation to aerospace.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Ming Mu,Guangmeng Chen,Wenjie Yu,Jiamei Liu,Yingjie Wang,Weiwei Zhao,Xiaoqing Liu
Advances in healthcare monitoring, human–machine interfaces, and soft robots require the development of wearable sensors that are efficient, scalable, and facile to prepare. Although laser-induced graphene (LIG) has recently attracted considerable attention in the fabrication of patterned graphene-based wearable sensors, the transfer process is inevitable due to the limited stretchability of carbon precursors. In this work, we proposed a strategy for in situ growth, transfer-free LIG on various flexible substrates (poly(dimethylsiloxane) (PDMS), poly(ethylene terephthalate) (PET), and paper). This was achieved by coating a biobased liquid carbon precursor (PGE-fa) on target substrates followed by laser irradiation under ambient conditions. After encapsulation, the fabricated flexible sensors were obtained. Based on the advantage of LIG in patterning, designs with different shapes and geometrical parameters were systematically investigated to optimize the sensing performance. The resulting LIG/PDMS sensor had a wide working range of ∼30% and demonstrated an ultrahigh sensitivity of 68,238.5 as well as outstanding stability over 10,000 cycles. Additionally, the sensor responded well to external stimuli at different bending angles. The potential applications of the sensor were further demonstrated by monitoring human motions, from subtle signals, including vocal cords, to large movements of the fingers and elbow joints.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 36
·e55920
·
IF 2.7
Yi Yang,Yin Lu,Kan Zhang
In this study, we designed and synthesized a series of norbornene-furan functionalized benzoxazine monomers ( HPAP-fa , HPAMP-fa , and HPTM-fa ) by regulating the bridge length in benzoxazine structure in order to improve the comprehensive performance of norbornene-furan functionalized benzoxazine system. This research systematically examined the impact of flexible segments on the structural information, polymerization behaviors, thermal stability, and flame retardancy of resulting polybenzoxazines. Initially, the structural characteristics of benzoxazine were confirmed through nuclear magnetic resonance, Fourier-transform infrared (FT-IR), and HR-MS. Subsequently, the polymerization mechanisms of each benzoxazine monomer were investigated utilizing differential scanning calorimeter and in situ FT-IR analyses. Finally, the thermal stability and flame-retardant properties were investigated by TGA and micro-combustion calorimetry measurements. Consequently, HPAP-fa exhibited the lowest polymerization temperature and the corresponding poly(HPAP-fa) showed very high thermal stability ( T d5 of 392°C and T d10 of 437°C) as well as excellent flame retardancy (HRC of 83.7 J g −1 K −1 ), which shows a significant improvement compared to poly(HPTM-fa) . As a result, the modulation of bridge segments within the monomer represents a viable approach towards enhancing the holistic efficacy of norbornene-furan functionalized benzoxazine systems.
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Jiamei Liu,Penglei Guo,Wenjie Yu,Weiwei Zhao,Kan Zhang,Xiaoqing Liu
Rapid heating is a facile and cost-effective approach to fabricate 3D graphene materials without using a heating furnace or gas resources. Nevertheless, the generated graphene products are usually supported on solid-state precursors, which brings difficulties in controlling their geometry and dimensions for satisfying various applications. Herein, we report a strategy of conversion of liquid bio-benzoxazine precursor into porous graphene via rapid laser irradiation for fabricating lubricant additives. The 3D porous laser-induced graphene (LIG) powder was used as an additive for polyalphaolefin (PAO4) lubricants, and their tribological behavior was investigated by the ball-on-disk linear reciprocating model. Besides, the effects of both additive concentrations and loads on friction-reducing and antiwearing were systematically evaluated. Taking advantage of the outstanding dispersion stability in oil, adding only 0.5 wt % of the 3D porous LIG additive into the PAO4 lubricant results in 52 and 97% decrease in terms of coefficient of friction and wear rate under a 2 N load, respectively. With unique graphene structural formation via rapid laser irradiation on liquid bio-benzoxazine, the obtained 3D porous LIG additive affords both filling and polishing effects in lubricants during friction. The achievements obtained in this work will pioneer a way for application of LIG technology in the tribological field.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Shun Chen,Fuwei Liang,Liping Jin,Chenpeng Ji,Nan Xu,Kun Qian,Wenwen Guo
With the increasing awareness of environmental protection, the demand for eco-friendly bio-derived flame-retardant for textiles has received increasing attention. In this work, a fully bio-derived phosphorylated furan-based flame retardant (FAP) was synthesized by the Schiff reaction of furan-based compounds (furfural and furfurylamine). To evaluate the application scope and flame retardant efficiency of FAP, cotton fabrics and PLA nonwovens were selected as biomass-based representatives of natural fiber materials and synthetic fiber materials, respectively. Significantly, based on the composition of furan ring, phosphorus and nitrogen containing components of FAP, excellent charring and flame retardant properties of coated cotton fabrics and PLA nonwovens can be expected. TGA results showed that the residual char of C-FAP-3 and P-FAP-3 were 39.7% (increased by 267.6%) and 16.7% (increased by 215.1%), respectively, higher than those of control cotton (10.8%) and PLA nonwoven (5.3%). Cone test results exhibited that the peak heat release rate (PHRR) and total heat release (THR) values of C-FAP-3 were sharply decreased by 69.4% and 37.8%, respectively. P-FAP-3 also displayed a significant reduction in PHRR, implying high flame retardancy of C-FAP-3 and P-FAP-3. Notably, through the weight gains of FAP coating on cotton and PLA as well as the final LOI and VBT results of the flame retardant treated fabrics, it can be preliminarily inferred that control cotton fabrics are more likely to achieve better flame retardant effects than PLA. Additionally, the facile synthetic strategy of fully bio-derived flame retardants is expected to promote the development of green flame retardant strategies for high-performance textiles.
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PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Zhiyi Guo,Qiufei Chen,Zhicheng Wang,Athar Ali Khan Gorar,Zhongcheng Pan,Jun Wang,Wenbin Liu
A bio-based bisphenol compound (DFA) was prepared using bisphenolic acid and furfurylamine in biomass as raw materials. Then, a bio-based amide phthalonitrile monomer (DFAP) was obtained in an environmentally friendly solvent. Nuclear magnetic resonance and Fourier transform infrared spectroscopy (FT-IR) proved the successful synthesis of DFA and DFAP. The curing behavior and curing kinetics of the polymer were studied using FT-IR and differential scanning calorimetry. Calculate the activation energy using the isoconversion method. The SB(m, n) autocatalytic reaction model describing the curing process of poly(DFAP) was modified and fitted by introducing the variable activation energy model. The thermal stability, thermomechanical properties and processing properties of the resin were studied using technologies such as thermogravimetric analyzer, dynamic mechanical analyzer and rheometer. The results show that the prepolymer has a wide processing window and a low melt viscosity. Poly(DFAP) has a high glass transition temperature and excellent thermal stability.
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高影响因子
危险品化学品经营许可证（带存储）