EUROPEAN POLYMER JOURNAL
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2020
·
IF 3.862
Yanlin Liu,Binbo Wang,Songqi Ma,Xiwei Xu,Jianfan Qiu,Qiong Li,Sheng Wang,Na Lu,Jiale Ye,Jin Zhu
Epoxy thermosets play a significant role in our life, while they have three common issues of depending on fossil resources, flammability and recycle difficulty. Nowadays, it’s still a challenge to address them simultaneously. Here, we report phosphate-based epoxy covalent adaptable networks (CANs) with reprocessability, degradability and flame retardancy from bioresources. Epoxy monomer synthesized from itaconic acid was cross-linked with phytic acid to achieve the phosphate-based epoxy CANs. The CANs were reprocessed at 160 °C within 1.5 h with the activation energy of the bond exchange of 49–90 kJ mol −1 and were readily degraded under mild basic conditions. Meanwhile, the epoxy CANs presented flame retardancy with UL-94 V0 rating and high LOI of 31.2–33.5% on account of the high phosphorus content of phytic acid. This work opens the door of developing phosphate-based CANs and provides a simple method to produce bio-based and fire-safe thermosets.
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Guodong Zhang,Guangyue Shi,Wentao Yuan,Yao Liu
In this study, phytic acid (PA) surface treatment was used to prepare iron-based soft magnetic composites (SMCs). The composition and microstructure of the SMCs were analyzed to assess changes in the magnetic properties . As the treatment time increased, the insulating layer on the powder surface gradually thickened, changing the internal morphology and conductive path of the annular samples after compacting. The changes in the magnetic properties and core loss were attributed to the increased resistivity and enhancement of the magnetic dilution effect. The optimal soft magnetic performance ( μ m = 389, P t = 235.1 mW/g measured at 100 kHz and 50 mT) was obtained by adjusting the processing time. This reduces the loss by 52.96% compared to the untreated sample and improves the application potential of soft magnetic composites at medium and high frequencies.
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COMPOSITES COMMUNICATIONS
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2020
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IF 4.915
Dong Wang,Yang Wang,Wei Wang,Ting Li,Jie Jiang,Bihua Xia,Pingming Ma,Minqing Chen,Weifu Dong
For many years, it has remained a hot topic to create a ductile polylactic acid (PLA) composite, especially by the modified lignin. Herein, we demonstrated a facile method for modified alkaline lignin (LMP) which was a toughener for PLA in the presence of polyethylene glycol 400 (PEG400). The mechanical tests showed that in addition to a high extensibility of 328.8%, as-designed PLA/PEG400/LMP ternary blend exhibited excellent toughness of 65.4 MJ·m −3 and high notched impact strength of 10.9 kJ·m −2 , which were respectively 12 and 2 folds of those of neat PLA. Moreover, the toughening mechanism of LMP particles in PLA composites from the morphology study was demonstrated. More importantly, it was meaningful to turn industrial waste lignin into wealth.
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MICROCHIMICA ACTA
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2020
·Vol. 187
·期 10
·1-9
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IF 6.232
Pu Chenlu,Zhao Hongli,Gu Qinying,Zheng Yu,Lan Minbo
A selectively modified porous metal/carbon nanocomposite was fabricated to enhance the enrichment of low-abundance phosphopeptides from biological samples. The carbon matrix derived from the metal-organic framework provides a suitable pore size to allow the diffusion of peptides, while the deliberately modified metal nanoparticles within the pores enhance their interaction with the phosphopeptides. This nanocomposite shows extremely high enrichment selectivity for phosphopeptides in the MALDI-TOF MS detection, even when the molar ratio of α-casein digests versus bovine serum albumin digests was up to about 1:20,000. By combining such nanocomposite with nano-LC-MS/MS, 4556 unique phosphopeptides were identified with high selectivity (95.2%) from HeLa cell extracts. Furthermore, phosphopeptides from prostate tissue digests were also determined. A total of 277 and 1242 phosphopeptides were identified from normal and tumor tissues of a patient with prostate cancer, respectively. This indicates that phosphorylation and prostate cancer can be related to each other.
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PubMed
高影响因子
Journal of Cleaner Production
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2020
·
IF 7.246
Xingguo Wang,Wenjia Wang,Shuheng Wang,Yufan Yang,Hongfei Li,Jun Sun,Xiaoyu Gu,Sheng Zhang
The demand for eco-friendly poly (lactic acid) (PLA) nonwovens grows at a high rate in the past several decades, however, only a little attention has been received for flame retardant PLA nonwoven fabrics. In this work, a novel halogen-free self-intumescent polyelectrolyte tris (hydroxymethyl)-aminomethane polyphosphate (APTris) was synthesized by reacting ammonium polyphosphate with tris (hydroxymethyl) aminomethane, and was then used to improve the fire resistance of PLA nonwovens via a dip-nip process. The flammability characterization indicated the limiting oxygen index value was increased to 30.0% from 18.3%, and the damaged area in the vertical burning test was reduced by about 87.0% by the presence of APTris. The cone calorimeter test results revealed that the peak heat release rate and total heat release of the treated sample were decreased by 41.0% and 28.2% respectively compared with that of the control PLA nonwoven sample. The char residue was increased to 12.3 from 1.7 wt % at 800 °C. It is suggested that the dense char barrier formed at the presence of APTris prevents heat, smoke, and gas transfer, and hence enhance thermal dilatability and flame retardancy of PLA nonwovens. This simple sustainable halogen-free treatment has great potential to produce cleaner commercialized flame-retardant PLA nonwovens.
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CHINESE JOURNAL OF POLYMER SCIENCE
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2020
·Vol. 39
·期 2
·181-188
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IF 3.154
Cao Jiang-Yong-Quan,Chen Si-Chong,Zhang Jie,Xie Yang-Yang,Wang Yu-Zhong
Due to the important role of oil source in our life, the separation of water-in-oil emulsion is urgent and necessary. Membrane seperation technology has been an efficient and widely used method in separating oil-water separation. Herein, we report a versatile approach to fabricate surface carbonized membranes with self-standing property from biomass-derived precursor by synergistic charring of phytic acid, arginine and filter paper. The obtained membrane exhibited superhydrophobicity in oil, excellent fouling resistance, and self-supporting ability. The membrane can be cycle-used at least 12 times with high permeation flux (up to 1380 L·m −2 ·h −1 ) and separation efficiency (up to 99.4%).
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
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IF 6.953
Yinchun Fang,Weihao Sun,Junwei Li,Hailong Liu,Xinhua Liu
Polyester/cotton blend fabrics are widely used in clothing and household textiles which combine the comfort of cotton and excellent mechanical strength of polyester. However, their high flammability due to the special “wick effect” resulting from the different thermal decomposition process of cotton and polyester causes greatly potential fire hazards. In this study, fully bio-based intumescent flame retardant (IFR) coating of chitosan/phytic acid (CS/PA) was layer-by-layer (LBL) assembly constructed on polyester/cotton blend fabrics. The LOI value of polyester/cotton blend fabric which was LBL assembly coated by 20 bilayers CS/PA reached 29.2%. And the dripping of coated fabric was eliminated. The results of cone calorimetry test confirmed CS/PA coating greatly improved the flame retardancy of polyester/cotton blend fabrics. Thermogravimetric analysis (TGA) results showed CS/PA coating changed the thermal decomposition process to promote the char formation of polyester/cotton blend fabrics. CS/PA coating on fabric could form the IFR system which acts through both condensed phase action by the catalysis dehydration reaction to forming stable char and gas phase action by the blowing effect. This research provides a new strategy to eco-friendly flame retardant and dripping-resistant for polyester/cotton blend fabrics by bio-based IFR system through facile LBL assembly method.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2020
·
IF 6.984
Fang Liu,Weidong Liang,Chengjun Wang,Jingxian He,Chaohu Xiao,Zhaoqi Zhu,Hanxue Sun,An Li
Solar-driven water evaporation is emerging as a promising strategy to utilize solar energy for the desalination and water purification . In this work, two kinds of monoliths based on hypercrosslinked polymers (HCPs) nanotubes , which were synthesized using inexpensive and conventional chemicals, i.e. benzene and methylbenzene as building blocks via Friedel-Crafts reaction, have been created as photothermal materials through a superhydrophilic modification followed by the coating of polypyrrole as light absorption layer . The as-synthesized HCPs possess large specific surface area (up to 773 m 2 g -1 ) and low apparent density (0.011 g cm -3 ), which endow them very low thermal conductivity (0.029 W m -1 k -1 ). After modification with sodium alginate and polypyrrole, the resulting HCPs (named as PPy-M-HCPs) show surface superhydrophilicity (water contact angle ~0°), stronger light absorption (ca. 95%) and better mechanical properties . Taking advantages of these unique physicochemical properties mentioned above, the PPy-M-HCPs exhibit outstanding light-to-heat conversion performance with a high solar conversion efficiency of ca. 87% achieved under 1 kW m -2 irradiation. In addition, the PPy-M-HCPs also show excellent salt-resistant performance, e.g. a high energy conversion efficiency of more than 85% obtained in 20 wt% NaCl solution, due to their loosely porous structure coupling with their superhydrophilic wettability . Based on the merits of simple fabrication process, excellent stability and high solar conversion efficiency, the PPy-M-HCPs may have great potentials as efficient photothermal materials for real applications.
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Asia-Pacific Journal of Chemical Engineering
·
2020
·Vol. 16
·期 1
·e2584
·
IF 1.06
Hao Xu,Guangming Lu,Shuan Liu,Jibin Pu,Shu Tian,Chunlong Mao,Shanjun Chen
A phytic acid-based surface tolerant epoxy coating was prepared, and the effect of phytic acid on the corrosion resistance of the composite coating on rusty carbon steel substrate was investigated. The results showed that the low-frequency impedance modulus of the composite coating on rusty carbon steel could reached 10 8 Ω·cm 2 order of magnitude after immersing for 480 h in 3.5 wt% NaCl solution. Compared with pure epoxy coating, the phytic acid-based surface tolerant epoxy coating on the rusty substrate exhibited better corrosion resistance even if with some artificial defects in the composite coating. The protective performance of the composite coating mainly came from the formation of a stable iron phytate chelate in the reaction of phytic acid and rust. For the rusty carbon steel, the original Fe 3+ on its surface was also transformed by phytic acid penetrating to the interface between the coating and the substrate. Therefore, a dense film was formed with the reaction of phytic acid and rust on the substrates, and the dense film became a part of the whole paint film, which could improve the corrosion resistance of the surface tolerant coating.
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RSC Advances
·
2021
·Vol. 11
·期 2
·1109-1114
·
IF 3.361
Peng Lv,Yeyun Meng,Lingxia Song,Hao Pang,Weiqu Liu
A robust self-supported electrode based on nanocellulose fibers (CNF), multi-walled carbon nanotubes (CNT), and polypyrrole (PPy) was prepared by a facile combination of ultrasonic dispersion and consequent in situ polymerization. In addition, the feasibility of utilizing this ternary composite as an electrode for supercapacitors was studied. The results revealed that the obtained CNF/CNT/PPy composite exhibited a large specific capacitance of 200.8 F g−1 at 0.5 A g−1. Equally important, the electrode capacitance retained about 90% of its initial value after 5000 charge/discharge cycles at a current density of 1 A g−1, which thus demonstrated its excellent cycling stability. The simple integration route and outstanding electrochemical properties distinguish this new composite as a prospective candidate for use as a high-performance electrode in supercapacitors.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Kai Wu,Yongzheng Zhang,Feng Gong,Dingyao Liu,Chuxin Lei,Qiang Fu
Polymer-based 1D materials with excellent axial thermal conductivity and electrical resistivity are highly demanded for thermal management in wearable electronics. In the last decades, boron nitride nanosheets (BNNS) were commonly introduced into polymer-based materials for improving their thermal conductivity, while they were mainly focused on 2D papery film or 3D bulk composite materials. 1D polymer/BNNS composite filaments are far from a rapid development, and their axial thermal conductivity is still restricted to a low value (<5 W/m K), mainly because of insufficient orientation and low addition of BNNS. Herein, a highly thermo-conductive but electrically insulating regenerated cellulose (RC)/BNNS composite filament is fabricated by a volume-confinement self-assembled method in a wet-spinning procedure, in which large-sized BNNS are mandatorily confined within the limited region among adjacent RC nanofibers at BNNS loading of 60 wt%. Attributed to its highly anisotropic conformation, the as-prepared composite filament exhibits an ultra-high thermal conductivity of 9.22 W/m K, about 4.5-fold of non-confined RC/BNNS counterpart. After being weaved into a textile and integrated with a thermoelectric generator (TEG), it enables TEG to efficiently harvest energy from body heat and continuously self-power some wearable electronics, demonstrating a significant proof of concept for its extraordinary wearable thermal management applications.
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EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Mohammad Ziaur Rahman,Chanchal Kumar Kundu,Xin Wang,Lei Song,Yuan Hu
A dual interaction-based (i.e., ionic/covalent) deposition of carbohydrate polymers, namely chitosan (CS) and oxidized sodium alginate (OSA) along with a plant-derived phosphorus-rich compound like phytic acid (PA) and a nitrogen rich compound like melamine (ME) was considered onto the phosphorylated chitosan (PCS) modified polyamide 6.6 (PA6.6) fabric surfaces in order to impart durable flame retardancy along with super-hydrophilicity of the same. Firstly, the pure PA6.6 textile surfaces were modified by PCS via UV-induced grafting and subsequently, the above-mentioned polyelectrolytes were assembled onto the fabric surfaces in a quadralayer fashion [i.e., (CS/ME-OSA-CS/ME-PA) n ; “n” represents the number of quadralayers (QLs)]. Here, the amino groups of CS/ME and the aldehyde groups of the OSA were stabilized via covalent interaction and the deposition of positively charged CS/ME and negatively charged phytic acid (PA) formed ionic interaction. In the vertical burning (UL-94) test, both the only PCS grafted and the simultaneously PCS-grafted along with LbL assembled fabrics could completely stop the melt dripping tendency and attained a V-1 rating. In the meantime, the limiting oxygen index (LOI) value received a moderate increase from 18.5 % of pure PA6.6 to 23.5 % for the PCS grafted and 8-QLs deposited fabric sample (i.e., PA6.6-g-PCS-8QL). Moreover, the PA6.6-g-PCS-8QL fabric sample exhibited a dramatic decrease in the peak heat release rate (pHRR) and total heat release (THR) by about 45 % and 24.7 % respectively alongside enhanced thermal stability. Apart from the appreciable flame retardancy, this fabric sample (i.e., PA6.6-g-PCS-8QL) could boost up the hydrophilicity to attain a water contact angle of 0°. Finally, this dual interaction-based deposition of bio-inspired polyelectrolytes posed a positive impact in enhancing the coating stability in laundering and imparting durable flame retardancy to sustain even up to 20 laundering cycles.
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