Catalysts
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2022
·Vol. 12
·期 7
·685
·
IF 4.501
Hao Dong,Cheng-Hua Xu,Fang-Lu Yang,Lei Du,Chen-Long Liu,Wen-Jing Chen,Lin Wang
Ca–Zr–Sn composite oxides catalysts for 1,4-butanediol (BDO) selective dehydration to 3-butene-1-ol (BTO) are synthesized by impregnation and co-precipitation in the present work. The results show that Ca–Zr–Sn catalysts prepared from co-precipitation by using NaOH-Na2CO3mixing alkali solution as precipitant exhibit an excellent catalytic property for BDO dehydration to BTO. For instance, Ca–Zr–Sn oxide with Ca/Zr and Sn/Zr molar ratio of 0.68 and 0.28 calcined at 650 °C gives a BDO conversion and BTO selectivity of about 97% and 82%, respectively, and exhibits no deactivation during 1000 h scale-up experimental testing. X-ray diffraction results indicate that catalytic active centers for BDO dehydration to BTO are from Ca0.15Zr0.85O crystal phase. NH3- and CO2-temperature programmed desorption prove that the surface of obtained catalysts can provide a large amount of acid and base sites simultaneously. FT-IR spectra of pyridine-adsorbed samples show that acid sites on the surface of Ca–Zr–Sn oxide catalyst mainly exist in a state of Lewis acid, which activates terminal -OH groups of BDO molecule through complexing. The activated -OH interacts with β-H activated on base sites O2−anions relative to Ca species, thereby the CH2=CH- bonds are produced through dehydration to form BTO.
研究领域:
化学工程
·
催化材料科学
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DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Miao Dong,Xinrui Lin,Xinyi Liu,Xiaodong Xu,Junhua Chen,Jianxin Yang
This study presents the rational design and performance evaluation of eco-friendly BIT-triazine acrylic resins for marine antifouling applications. Two monomers were synthesized using cyanuric chloride as a core scaffold, incorporating the effective biocide 1,2-benzisothiazolin-3-one (BIT) and a polymerizable methallyl alcohol group. A total of 22 copolymers were prepared via copolymerization with acrylic esters and laboratory-synthesized functional monomers. Their chemical structures were confirmed by FT-IR and 1H NMR spectroscopy. Hydrolytic degradation tests revealed that polymers containing zinc monomers showed the highest contact angle change (Δθ > 20°), while those with heterocyclic monomers exhibited the fastest surface erosion rates (0.0138 mg/cm2/day), indicating tunable degradation behavior. Biological assays demonstrated excellent antifouling performance: polymers with pyridin-2-yl acrylate achieved algae inhibition rates of 94.47–99.93% and antibacterial rates of 98.61–99.69% against various marine strains. Importantly, these polymers exhibited low or negligible toxicity toward mussels and barnacle larvae. In a 90 day marine field test, all resins showed a strong antifouling efficacy, particularly those containing zinc or heterocyclic monomers. This work establishes a modular design strategy for multifunctional antifouling resins that are adaptable to diverse marine environments, including ships, aquaculture systems, and submerged infrastructure.
研究领域:
高分子科学
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海洋生物技术
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材料科学
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环境科学
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涂层技术
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DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Teng Wang,Tianqi Xu,Hao Yuan,Lang Xu,Ying Cai,Tian Zuo,Wenjing Liu,Jiawen Zhang,Lingmin Yi
Non-specific protein adsorption on material surfaces is a critical challenge in the fields of biomedicine applications, often compromising device functionality and causing potential health risks. To address this challenge, a series of amphiphilic mixed brush coatings composed of hydrophilic poly(carboxybetaine methacrylate) (PCBMA) and hydrophobic poly[methyl(3,3,3-trifluoropropyl)siloxane] (PMTFPS) were designed and prepared. The surface restructuring behaviors of these mixed brushes affect their synergistic antifouling effects, resulting in distinctly different protein-resistant properties. When the PCBMA chains are shorter than the PMTFPS chains and the grafting density of PCBMA is moderately higher than that of PMTFPS, the mixed brushes exhibit excellent protein adsorption resistance after both dry and wet treatments. The presence of a suitable number of PMTFPS chains on the surface not only provides the fouling-release property but also minimizes the disturbance on hydration from protein contact, thereby maximizing synergistic antifouling effects. This work can provide unique insight for designing brush coatings with excellent protein-resistant performance in the future.
研究领域:
生物医学工程
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材料科学
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表面工程
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高分子科学
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生物污损防护
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Honglei Wang,Chuhan Sun,Xingui Zhou,Jinshan Yu
Tantalum carbide (TaC) matrix composites are widely used in aerospace thermal protection systems due to their high melting point and excellent thermal shock resistance. In the precursor infiltration and pyrolysis (PIP) process, the TaC precursor plays a critical role in the fabrication of the composites. However, conventional tantalum alkoxide precursors often suffer from insufficient crosslinking sites and lack of molecular-level mixing between the Ta and C sources. To address these issues, this study synthesized an unsaturated TaC precursor using tantalum pentachloride (TaCl 5 ) and 3-buten-1-ol as reactants, with allyl novolac resin (AN) introduced as the carbon source. The C=C bonds in the structure acted as active crosslinking centers during copolymerization, leading to the formation of a densely cross-linked network in the PTC-Butene precursor. Using PTC-Butene solution as the precursor and 30 vol% carbon fiber felt as the reinforcement, C f /TaC composites were successfully fabricated by PIP process. The composites were subjected to oxyacetylene ablation tests for 10, 60 and 120 s, and the ablation mechanisms were systematically investigated. Results show that during ablation, a molten Ta 2 O 5 layer formed on the surface, which acted as a barrier against oxygen diffusion. However, this oxide layer was continuously eroded by the high-speed gas flow. Carbon fibers helped alleviate thermal stress and suppress matrix cracking, yet inherent pores within the composites and channels left after fiber oxidation provided pathways for oxygen infiltration.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 40
·51184
·
IF 3.125
Siyuan Jiang,Yufei Liu,Xiaoyu Zou,Min He,Kai Zhang,Guomin Xu,Shuhao Qin
The two macromolecular antioxidants, P(3,5-di-tert-butyl-4-hydroxy cinnamic acid-alt-N-phenylmaleimide) (PCN) and P(3-butene-1-yl-3,5-di-tert-butyl −4-hydroxyphenyl propionate-alt-N-phenylmaleimide) (PPN) were designed and synthesized via free radical copolymerization. The structures of the resulting PCN and PPN antioxidants were characterized by Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy ( 1 H NMR), and gel permeation chromatography. In addition, the effect of the two macromolecular antioxidants on the thermal oxidation aging resistance of polyamide 6 (PA6) was studied. According to the analysis of differential scanning calorimetry, thermogravimetric analysis, dynamic mechanical analysis, dynamic viscosity, and the mechanical property of PA6 and its blends, these two types of macromolecular antioxidants protected the molecular chain of PA6 from breaking, protected the crystallization of PA6 and maintained the stability of PA6 crystal form, improved the activation energy of thermal degradation and thermal stability of PA6, enhanced the strength and elasticity of PA6 and maintained the mechanical properties of PA6 during aging to a certain extent.
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Polymer Chemistry
·
2020
·Vol. 11
·期 12
·2252-2261
·
IF 5.342
Li Zhang,Dongjian Shi,Yunyun Gao,Tianyang Zhou,Mingqing Chen
To overcome the thermodynamic instability of polymeric micelles in an extremely high dilution bio-environment, unimolecular micelles with covalently-bound molecular architectures have been widely studied for drug delivery. In this work, an amphiphilic multi-arm star random copolymer, polyamidoamine-poly(butenyl phospholane-co-methoxy phospholane) with phenylboronic acid end groups (abbreviated as PAMAM-P(BEP-co-MP)-PBA), was synthesized by a simple one-pot ring-opening polymerization with the fourth-generation PAMAM dendrimer as a macro-initiator. Then, unimolecular micelles (UMs) were formed by the obtained copolymers in a dilute aqueous solution. Dynamic light scattering (DLS) and transmission electron microscopy (TEM) results showed that the UMs possess uniform spherical structures and stable hydrodynamic sizes (ca. 20 nm). Besides, further information on polymer repeat unit numbers could be theoretically calculated by comparison of hydrodynamic sizes and contour lengths. Doxorubicin (DOX) could be encapsulated into the inner hydrophobic regions of the UMs. The obtained DOX-loaded UMs exhibited a slow and sustainable release behavior in an intracellular simulated environment. Furthermore, in vitro cytotoxicity and cellular uptake studies demonstrated that the DOX-loaded UMs could specifically recognize and accumulate in HepG2 cells, and then inhibit tumor cell growth effectively. Therefore, this PBA-functionalized unimolecular micelle could be a promising candidate for targeted drug delivery.
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高影响因子
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