JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 15
·e53718
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IF 3
Qing Li,Shuangfei Xiang,Feiya Fu,Xiangdong Liu,Shujun Zhao
Exploitation a facile and effective strategy for preparing benzoxazine resins with outstanding processability and robust mechanical properties still exists a challenge. In this work, a co-catalytic concept was proposed to fabricate high-performance benzoxazine resin by employing curing agent to derive reactive diluent to construct microphase-separated system. Given on the design, the reactive diluent dissolved solid benzoxazine into a low-viscosity solution, after which the curing agent presented a catalytic effect on diluent and benzoxazine to optimize the curing crosslinking reactions. As a result, it not only increased crosslinking density for a stable mechanical network, but also induced a microphase-separated structure to effectively dissipate energy for a strong yet tough resin system, as proved by Fourier transform infrared, differential scanning calorimetry, and dynamic mechanical analyses measurements. Moreover, the as-prepared modified benzoxazine resin showed great potential to fabricated composites with glass fiber, in which the values of tensile strength, elongation at break, and toughness presented an improvement of 212.1%, 106.8%, and 75.0% compared to composite with pristine PH-ddm and glass fiber, respectively. These results suggested an effective path to improve the processability and overall mechanical properties of benzoxazine resins, opening a new strategy to develop high-performance benzoxazine materials.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Miaomiao Ye,Ningyao Tao,Xiaojiao Zhou,Xingyuan Wang,Wen Jin,Tuqiao Zhang,Xiaowei Liu
Salt accumulation and volatile organic compounds (VOCs) entering condensed freshwater are two main drawbacks in the new approach of solar-driven seawater desalination. In this work, a super-hydrophilic honeycomb activated carbon (SHHAC) evaporator was fabricated for simultaneous salt rejection and VOCs removal. The optimal water evaporation rate of the SHHAC evaporator was as high as 1.50 kg·m −2 ·h −1 under one sun illumination with the corresponding photothermal conversion efficiency of 99.4 %. Due to the super-hydrophilic properties, high water absorption capacity, fast water absorption rate and unique honeycomb structure of SHHAC, the salt-rejection property of the SHHAC evaporator was achieved by flowing back the concentrated brine to the underneath seawater. Simultaneously, the distillation concentration ratio (R D ) of phenol was reduced from 75 % to 0 % by the SHHAC evaporator resulting in zero phenol entering condensed freshwater. Finally, the potential application of the SHHAC evaporator was demonstrated by an expanded outdoor experiment using the real seawater as the feedwater.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Linwei Zhang,Jianchao Wu,Xianbo Yang,Youbo Di,Xupin Zhuang
Thermal insulation fabric for personal thermal protection equipment subjected to harsh conditions is urgently needed but remains challenging. Here, a high-ortho-silicane-modified phenolic resin (SiPR) with linear molecular structure and excellent spinnability is synthesized and melt-blown as a fibrous nonwoven mat with small fiber diameter (less than 4 µm) and high porosity (88%). Benefitting from the synergistic effect, the cured SiPR nonwoven (SiPR-MBNM) demonstrates high heat resistance , flame retardance, and low heat conductivity , which endow it with excellent thermal insulation performance in high-temperature environments. Complemented with the high production capacity of melt-blowing technology, SiPR-MBNM offers promising prospect for personal thermal protection equipment subjected to harsh and high-temperature conditions.
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Polymer Chemistry
·
2023
·Vol. 14
·期 6
·754-762
·
IF 4.6
Lei Zhang,Yujie Liang,Jiazhu Xu,Hong Zheng,Wenjie Sun,Yonghong Cheng
1,3-Benzoxazine has long been considered as a unique polymerizable benzoxazine species to prepare high performance polymers. Herein, polymerization of 2H,4H-3,1-benzoxazine is observed for the first time and the thermal properties of the obtained material are studied. A phenolic hydroxyl-containing mono-functional 3,1-benzoxazine monomer has been synthesized. With additional phenol substitution, 3,1-benzoxazine is able to undergo ring-opening polymerization. The reaction kinetics and variation in the molecular structure during polymerization were systematically investigated. Besides, quantum chemistry simulation showed that the C–O and C–N bond strength reduction in the 3,1-oxazine ring induced by adjacent phenol substitution is the critical factor that endows the monomer with polymerization ability. A polymerization mechanism of 3,1-benzoxazine has been proposed. The reported 3,1-benzoxazine monomer has good evaporation resistance even at 200 °C for 2 hours. More importantly, the cured material shows attractive thermal performance, with a glass transition temperature of 217 °C and a decomposition temperature above 400 °C together with a char yield of 54%. This study offers a new way to develop polymerizable benzoxazines with high performance for numerous emerging applications.
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INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Ruisen Shi,Xueru Sheng,Haiyuan Jia,Jian Zhang,Na Li,Haiqiang Shi,Meihong Niu,Qingwei Ping
Transparent wood (TW) is a novel biomass-derived composites with potential applications in many areas. In general, the preparation of TW usually involves two steps: (1) the delignification treatment of the wood and (2) the impregnation of the delignified wood (DW) with the resin. However, the resins used for the impregnation still need to be produced from traditional petrochemical materials, which does not fit the concept of green chemistry and carbon neutrality. In this work, a new type of the sustainable transparent wood (STW) was fabricated with the sustainable PG resin and the balsa wood. PG resin was obtained by the polymerization of the phenol and glucose, which could be prepared by the catalytic degradation of the lignin and cellulose , respectively. The obtained STW exhibited good light transmittance (45.8%), excellent mechanical performance (162.1 MPa) and thermal stability. In terms of the PG resin synthesis, a possible mechanism is proposed according to the characterization results.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yan Hu,Zhendong Zhao,Huiwang Dai,Wenjun Zhou
Efficient, stable, and reusable composite of Co 3 O 4 /g-C 3 N 4 with abundant oxygen vacancies (OVs) were successfully constructed using a facile grinding and calcination method. The catalytic performances of OVs-enriched Co 3 O 4 /g-C 3 N 4 activated peroxymonosulfate (PMS) for the degradation of phenanthrene (PHE) and their underlying mechanisms were investigated. The catalytic activity of xCo 3 O 4 -C 3 N 4 with OVs was significantly greater than that of Co 3 O 4 -C 3 N 4 without OVs, and there was a substantial positive correlation between the degradation rate constant of PHE and the OVs content in xCo 3 O 4 -C 3 N 4 . Quenching experiments and EPR tests demonstrated that 1 O 2 is the dominant active species in the 2.0Co 3 O 4 -C 3 N 4 /PMS system, which differs from the radical-dominated activation pathway of conventional cobalt-based heterogeneous catalysts . The results indicate that the OVs introduction in the catalyst can effectively modulate the PMS activation pathway, and the proposed non-radical systems can achieve efficient degradation of PHE. In addition, the synergistic interaction between the redox cycle of Co 2+ /Co 3+ and the electron-rich O-C 3 N 4 carrier favored the degradation of PHE via the radical pathway. This study provides a new theoretical basis and reference for the facile preparation of PMS catalysts and even envision this approach may open new vistas in the application of non-radical systems in refractory organic pollutant treatment.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Dongsheng Luo,Hongfei Yin,Jingxin Li,Binqiang Tian,Huaiqi Li,Yaoguang Li,Chunguang Li,Yuehua Zhang,Mengqi Chen,Yanqiu Jing
Nowadays, researchers make great effects to eliminate some harmful chemicals produced by tobacco. Photocatalysis is one of the most advanced techniques and can degrade organic contaminants effectively. In this paper, a novel CoS@ZnIn 2 S 4 -Ce heterostructured cage was successfully prepared for degradation. After various characterizations, CoS@ZnIn 2 S 4 -Ce exhibited a significant separation of the photo-generated electrons and holes and could degrade phenol effectively no matter under UV light (98.46 %) or visible light (96.72 %). Furthermore, CoS@ZnIn 2 S 4 -Ce could degrade nicotine (91.62 %), benzopyrene (84.65 %) and nitrosamine (99.18 %) effectively under visible light. The effects of the initial conditions on degradation of phenol was also well investigated. The optimal conditions were 0.5 g/L of catalyst dosage, 4.35–7.00 of pH value and 10 mg/L of phenol initial concentration. OH and O 2 − were the main active radicals during the photo-degradation process. On this basis, a possible photocatalytic degradation pathway for degradation of contaminants produced by tobacco are proposed.
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Journal of Analysis and Testing
·
2022
·Vol. 7
·期 1
·8-15
·
IF 0
Wang Danni,Li Hui,Qiu Hongdeng,Chen Jia
In this paper, silicon quantum dots (SiQDs) with green fluorescence are synthesized by solvothermal reaction of 3-(2,3-epoxypropoxy)propyltrimethoxysilane (GPTMS) and ethylenediaminetetraacetic acid (EDTA), and then SiQDs are bonded to the surface of silica to obtain a new nano-on-micro stationary phase (SiO 2 -SiQDs) for reversed-phase chromatography. The successful preparation of SiO 2 -SiQDs stationary phase is demonstrated by a variety of characterizations, such as transmission electron microscopy, laser confocal microscopy, elemental analysis and Fourier infrared spectroscopy. In addition, the chromatographic performance of the prepared stationary phase is evaluated and it shows good separation performance for non-polar substances such as alkylbenzene, aniline and polycyclic aromatic hydrocarbons in reversed-phase liquid chromatography. It is also verified that the stationary phase has good methyl selectivity and shape selectivity. More interestingly, the separation of prednisolone and hydrocortisone isomers can also be achieved at a low ratio of organic solvents, indicating that this new stationary phase has a good application prospect in isomer separation.
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JOURNAL OF CHROMATOGRAPHY A
·
2022
·
IF 4.601
Lei Zeng,Wenbo Xie,Lijuan Jiang,Xingdong Yao,Hao Li,Boan Shi,Fuhou Lei
As green, less toxic, and abundant ligands with rich functional groups, natural products are widely used in synthesis of chromatographic stationary phases. In this work, dodecyl imide maleopimaric acid glycidyl methacrylate ester (C12-MPAGN) was prepared from maleopimaric acid through the imidization and ring-opening based esterification reaction. By using “thiol-ene” click chemistry, it was chemically bonded to the silica and (3-mercaptopropyl) trimethoxysilane (γ-MPS) was used as the coupling agent to obtain dodecyl imide maleopimaric acid glycidyl methacrylate ester bonded silica stationary phase (Sil-C12-MPAGN). Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), scanning electron microscopies (SEM), and elemental analysis (EA) were utilized to verify that the Sil-C12-MPAGN stationary phase was successfully prepared with C12-MPAGN immobilized on the silica surface. In order to evaluate the chromatographic performance and retention mechanisms of the Sil-C12-MPAGN column and compared with C18 column, a variety of compounds were used, including stander mixture of Tanaka, alkylbenzenes, polycyclic aromatic hydrocarbons (PAHs), phenols and flavonoids. Based on these multiple interactions, including hydrophobic, hydrogen-bonding, and π-π interactions, high selectivity and superior separation performance were demonstrated by the Sil-C12-MPAGN column for probe molecules what had previously been mentioned. In addition, the quantitative determination of paclitaxel content in Yew bark extract was conducted with this column, which was found that the concentration was 83.67 mg/L, respectively. In short, the present study proposes a new strategy for introducing rosin to liquid chromatography with high selectivity and separation performance.
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PubMed
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DESIGNED MONOMERS AND POLYMERS
·
2022
·
IF 3.718
Shichang Chen,Xuhai Fu,Zhijun Jing,Hongzheng Chen
PBT and PET are subjected to thermal-oxidative degradation and thermomechanical degradation during the process of melt blending, which affect the polymer structure and properties. The effect of feed properties of PET and the addition of modified nanoparticles on blends are a question worthy of discussion. This work describes the melting and thermal stability, the crystallization behavior and non-isothermal crystallization kinetic, the rheological behaviors and mechanical properties of several PBT/PET blends prepared by twin-screw melt extrusion. Results show that the molecular chain of the polyester blends obtained by stable extrusion are not significantly degraded, there is only one obvious melting peak and crystallization peak on the thermal analysis curves, and the melting point is lower than either of the two polyesters. An appropriate amount of SD can effectively reduce the crystallization rate of the PBT material and extend the crystallization time. The rheological behavior of PBT/PET blends is complicated than PET raw materials and SD, as well as the melt processing temperature and shear rate will all affect the rheological behavior of the blends. For example, at low shear rate, polyester blends with SD exhibit strong shear thinning behavior. In general, the SD content affects the rheological property of blends in a way similar to the law of influence on crystallization behavior. When SD content is 0.3 wt%, a polyester product with higher elongation at break than pure PBT can be obtained. This can provide a useful reference for preparing commercialized polyester blend products with good melt processability and elongation by simple blending.
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PubMed
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OPTICAL MATERIALS
·
2022
·
IF 3.754
Zhenzhen Huang,Yanxin Wang,Xianhang Yan,Xinhui Mao,Zhiyuan Gao,Matt J. Kipper,Linjun Huang,Jianguo Tang
In this work, a luminescent lanthanide complex, namely, Eu(tta) 3 phen (Eu = europium , tta = 2-thenoyltrifluoroacetone, phen = 1, 10-phenanthroline) is used as a luminescent dopant to prepare fluorescent nanofiber films. The resulting nanofibers (CS/PEO-SiO 2 @Eu(tta) 3 phen) are composed of chitosan and polyethylene oxide containing silica nanoparticles , encapsulating the Eu(tta) 3 phen. The nanofibers are stabilized by treatment with sodium bicarbonate (NaHCO 3 ) aqueous solution as neutralizer and then repeatedly washed with deionized water. A more stable Na-CS/PEO-SiO 2 @Eu(tta) 3 phen fiber film is obtained as a fluorescence sensor for Cu 2+ ions. The Na-CS/PEO-SiO 2 @Eu(tta) 3 phen has high sensitivity, and a wide detection range. The response is linear in the concentration range from 10 to 90 μmol/L, and the detection limit is 0.826 μmol/L. In addition, Na-CS/PEO-SiO 2 @Eu(tta) 3 phen nanofiber film can be used as a recyclable sensor for the detection of Cu 2+ ions in aqueous solution due to its good recyclability, selectivity and rapid optical response.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jie Zhao,Yunning Chen,Renquan Guan,Xueying Cheng,Zhengkai Wu,Nana Zhao,Qingkun Shang,Yingnan Sun
In this paper, we successfully constructed two composite photocatalysts TiO 2 @PDI-NapSO 3 H and Fe-TiO 2 @PDI-NapSO 3 H by utilizing water-soluble PDI derivatives to bond with TiO 2 or iron-doped TiO 2 . Their photocatalytic performance to degrade phenol and diclofenac sodium (DCF) under visible light were investigated. The results show that PDI-NapSO 3 H can effectively improve the optical absorption properties of TiO 2 . Furthermore, the oxygen vacancy produced by doping of Fe in TiO 2 prevents the recombination of photogenerated carriers effectively. The larger conjugate plane of PDI-NapSO 3 H provides a convenient channel for the migration and separation of photogenerated carriers. Thus almost 99 % of phenol or DCF can be degraded by Fe-TiO 2 @PDI-NapSO 3 H within 90 or 120 min, respectively. However, the photocatalytic activity of Fe-TiO 2 @PDI-NapSO 3 H is better. The rate of phenol degradation is much higher than that of TiO 2 @PDI-NapSO 3 H. Further, through the photoelectric response characteristic analysis, radical trapping experiment and EPR test, the effects mechanism of the energy band structure, photogenerated carrier separation efficiency on the photocatalytic performance of Fe-TiO 2 @PDI-NapSO 3 H were discussed. In addition, the possible degradation pathways of DCF and the reasons for the obvious reduction of environmental toxicity after photocatalytic degradation were proposed.
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