Gels
·
2023
·Vol. 9
·期 10
·805
·
IF 4.6
Fengbao Liu,Jinsheng Sun,Xianbin Huang,Yuan Geng
Currently, conventional polymeric filtrate reducers with high-temperature resistance for use in drilling fluids have high molecular weights, which greatly affects the rheological properties. Therefore, to address the challenges in regulating the rheology and filtration performance of high-density drilling fluids at high temperatures, it is essential to develop low-molecular-weight filtrate reducers with high-temperature resistance. In this study, a low-molecular-weight filtrate reducer with high-temperature resistance (LMF) was prepared via free radical polymerization from acrylamide and 2-acrylamido-2-methyl-1-propanesulfonic acid as monomers, tertiary dodecyl mercaptan as a chain transfer agent, and ammonium persulfate as the initiator. LMF was then characterized by infrared spectroscopy, thermogravimetric analysis, and gel permeation chromatography. The obtained filtrate reducer exhibits a weight-average molecular weight (Mw) of 3819 and an initial thermal decomposition temperature of 300.7 °C, indicating good thermal stability. The effects of LMF dosage, temperature, and NaCl dosage on the rheology and filtration performance of mud samples were also investigated, and the mechanism of action was revealed by zeta potential, particle size distribution, scanning electron microscopy, and adsorption measurements. The results reveal that LMF increases the mud sample viscosity and reduces its filtration. For example, the filtration of the mud sample with 2 wt% LMF was 7.2 mL, a reduction of 70% compared to that of a blank mud sample. Further, after aging at 210 °C for 16 h, the filtration of the same sample was 11.6 mL, and that of a mud sample with 2 wt% LMF and 35 wt% NaCl after aging at 180 °C for 16 h was 22 mL. Overall, we have reported a scheme to prepare a low-molecular-weight filtrate reducer with high-temperature resistance and superior filtrate-reducing effects, laying the foundation for the investigation and development of low-molecular-weight filtrate reducers.Keywords:low molecular weight;high-temperature resistance;salinity tolerance;filtrate reducer
研究领域:
石油工程
·
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY
·
2020
·
IF 1.992
Jin Xu,Xuejia Shi,Xiaomeng Zhang,Zhenzhong Wang,Wei Xiao,Linguo Zhao
To efficiently recycle GH78 thermostable rhamnosidase (TpeRha) and easily separate it from the reaction mixture and furtherly improve the enzyme properties, the magnetic particle Fe 3 O 4 -SiO 2 -NH 2 -Cellu-ZIF8 (FSNcZ8) was prepared by modifying Fe 3 O 4 -NH 2 with tetraethyl silicate (TEOS), microcrystalline cellulose and zinc nitrate hexahydrate. FSNcZ8 displayed better magnetic stability and higher-temperature stability than unmodified Fe 3 O 4 -NH 2 (FN), and it was used to adsorb and immobilize TpeRha from Thermotoga petrophilea 13995. As for properties, FSNcZ8-TpeRha showed optimal reaction temperature and pH of 90°C and 5.0, while its highest activity approached 714 U/g. In addition, FSNcZ8-TpeRha had better higher-temperature stability than FN. After incubation at 80°C for 3 h, the residual enzyme activities of FSNcZ8-TpeRha, FN-TpeRha and free enzyme were 93.5%, 63.32%, and 62.77%, respectively. The organic solvent tolerance and the monosaccharides tolerance of FSNcZ8-TpeRha, compared with free TpeRha, were greatly improved. Using naringin (1 mmol/l) as the substrate, the optimal conversion conditions were as follows: FSNcZ8-TpeRha concentration was 6 U/ml; induction temperature was 80°C; the pH was 5.5; induction time was 30 min, and the yield of products was the same as free enzyme. After repeating the reaction 10 times, the conversion of naringin remained above 80%, showing great improvement of the catalytic efficiency and repeated utilization of the immobilized α-L-rhamnosidase.
研究领域:
生物化学
·
酶工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Baowei Qiu,Youquan Ling,Xiwen Gu,Lei Wang,Fei Chen,Shengtai Zhou,Huawei Zou,Mei Liang
Applying suitable sizing agents is effective in improving the interfacial performance of carbon fiber reinforced composites (CFRPs). However, the poor thermal stability of conventional epoxy-based sizing agent limits their application at elevated temperatures for preparing advanced CFRPs. The question could lead to interfacial damage of composites at high temperatures, thus deteriorating their mechanical properties. In this work, diethanolamine (DEA) was selected to modify E51 resin to obtain a high-temperature resistant sizing agent (E51@DEA). The decomposition temperature of E51@DEA was 320 °C, which was 140 °C higher than that of E51. Furthermore, the resultant composites treated by E51@DEA 2 % showed robust interfacial performance (ILSS = 74.32 MPa, IFSS = 100.70 MPa), which was both increased by about 25 % compared to unmodified samples. In addition, the modified fiber could completely retain their interfacial reinforcement after treatment at 300 °C for 4 h. The prepared composites combined excellent thermal and interfacial properties, further expanding the application range of CFRPs.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Yiming Zhao,Yonggan Yan,Xin Cui,Xunwei Wu,Hui Wang,Jun Huang,Xiaoyong Qiu
The rapid development of flexible electronics motivates the design and synthesis of stable hydrogels that possess good stretchability and conductivity under harsh environment. The long-term durability of traditional hydrogels generally fails at high temperatures. In this work, a high-temperature-tolerant, self-healable hybrid hydrogel showing excellent water-locking and adhesive properties was developed through ultraviolet curing of acrylamide (AM) and hyper-branched polyethyleneimine (PEI) in highly salted ethylene glycol-water solution. Ethylene glycol was used as a crystallization inhibitor and greatly enhanced the solubility of sodium acetate (NaAc). The fabricated hydrogel can retain 75 % of its initial weight for 9 hours at 100 °C or 88 % of its initial weight for 77 hours at 15 % relative humidity (RH) environment. The dehydrated gel was flexible (tensile strain > 1700 %) and conductive after storing at high temperatures (e.g. 100 °C) for a long term. Moreover, the highly salted hydrogel showed remarkable water adsorbing ability in the air: it can recover to its original weight after losing water at high temperature or low humidity conditions. In addition, the separated hydrogel fragments could heal into a single piece in 30 s, and the hydrogel showed reversible adhesiveness to both organic (6.2 kPa for pigskin, 28 kPa for wood) and inorganic (111.9 kPa for glass, 135.5 kPa for iron) substances for at least 5 cycles. This work provides a facile way of obtaining multi-functional conductive hydrogels that can work at high temperatures, demonstrating long-term prospects in engineering applications.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Huamei Zhu,Chaoen Jin,Fan Wang,Yaping Zhu,Shifeng Deng,Huimin Qi
Silicon-containing arylacetylene (PSA)-based composites show excellent heat resistance and dielectric properties, making them highly promising for applications in the aerospace and electronic information fields. However, the low polarity of PSAs and poor interfacial adhesion with fibers lead to weak mechanical properties of their composites. In this study, a novel PSAs-like heat-resistant silane coupling agent (P-SCA) was synthesized through Grignard reagent condensation reaction and used to modify the surface of quartz fiber (QF). Due to the special chemical structure of P-SCA, the siloxanes in P-SCA can undergo dehydration condensation with silicon hydroxyl groups on the quartz fiber cloths and graft onto the surface, while the alkynes in P-SCA can react with the PSAs resin, enhancing the interfacial bonding by forming strong mechanical interlocking and chemical bonds. The composite prepared by quartz fiber cloth treated with 3.5 wt% P-SCA (QF@3.5%P-SCA) shows that the interlaminar shear strength (ILSS) and flexural strength are 21.0 and 270.6 MPa at room temperature, respectively, which have increased by 32.1% and 63.2%, respectively. And at 500°C, the ILSS and flexural strength are 9.3 and 131.7 MPa, increasing by 44.3% and 50.7%, respectively. The mechanical properties of QF@P-SCA/PSA composites are significantly improved while maintaining their excellent heat resistance. Hightlights A heat-resistant silane coupling agent with alkynes was synthesized. The high temperature resistant interface is constructed by the coupling agent. Mechanical interlocking and chemical bonding can occur at the interface. The composites showed good mechanical properties at elevated temperature.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2016
·Vol. 99
·期 8
·2760-2768
·
IF 2.787
Xue Mao,Ying Bai,Jianyong Yu,Bin Ding
Polynanocrystalline yttria-stabilized zirconia (YSZ) nanofibrous membranes with robust flexibility and heat resistant were fabricated by a combination of electrospinning and heat-treatment process. The morphology and crystallographic structure of YSZ nanofibrous membranes were revealed and regulated by varying polymer composition in precursor solutions, which resulting in an effective control of mechanical properties from brittleness to robust tensile strength of 5.04 MPa. In addition, the relationship between the precursor composition and grain size is deeply discussed during the calcination process. Meanwhile, an inverse Hall–Petch effect of nanocrystalline materials was displayed on the YSZ nanofibrous membranes, due to the abundantly existence of ribbons. Furthermore, the flexible YSZ nanofibrous membranes with excellent bending resistance of 400 times and heat resistance of 1473 K exhibit high filtration efficiency of 99.996% for NaCl particles in the size range 300–500 nm, which suggested them to be promising candidate for high-temperature filtration fields including metallurgy, steel, electric power, incineration, cement industries, etc.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-8
·
IF 12.121
Sun Yong,Sun Bo,He Jingbo,Yang Guowei,Wang Chengxin
Providing high performance electrical nano-interconnects for micro-nano electronics that are robust in harsh environments is highly demanded. Today, electrical nano-interconnects based on metallic nanowires, e.g. Ag and Cu, are limited by their positive physicochemical reactivity and ductility under large strain (i.e. irreversible dislocations and local necking-down elongation) at high temperatures or in strong oxidizing and acidic environments. Herein, to overcome these limitations, high-quality millimetre-sized soft manganese-based silicide (Mn 5 Si 3 @SiO 2 ) nanowire nanocables are designed via a glassy Si–Mn–O matrix assisted growth. The proposed nanocables exhibit good electrical performance (resistivity of 1.28 to 3.84×10 -6 Ωm and maximum current density 1.22 to 3.54×10 7 A cm −2 ) at temperatures higher than 317°C in air atmosphere, strongly acidic (HCl, PH=1.0) and oxidizing (H 2 O 2 , 10%) ambient, and under complex electric field. The proposed Mn 5 Si 3 @SiO 2 nanocables, which withstand a strain of 16.7% free of failure, could be exploited for diverse applications in flexible electronics and complex wiring configurations.
研究领域:
材料科学
·
纳米技术
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 7
·1-12
·
IF 2.8
Zhang Xinle,Chi Qingguo,Tang Chao,Li Hua,Zhang Changhai,Li Zhonghua,Zhang Tiandong
The rapidly growing third-generation wide-band-gap semiconductor electronic device industry urgently requires high-temperature-resistant packaging materials. However, the epoxy molding compound materials cannot suffer the high-temperature working condition due to the intrinsic molecular chain structure of epoxy materials (EP). In this paper, bisphenol A-type cyanate (BADCy) with triazine ring structure was introduced into EP to improve its heat resistance. The curing reaction as well as the curing mechanism has been clearly revealed for BADCy/EP with different contents of BADCy according to the Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimeter (DSC) results. In the whole copolymer system, the copolymer at higher BADCy concentration (50–60 mol%) achieved the highest crosslink density (12.8 × 10 –3 mol/cm 3 ), thus, showing excellent glass transition temperature (> 200 °C) and thermal decomposition temperature( T 5% > 400 °C). The heat resistance and electrical insulation property of BADCy/EP system have been systematically investigated, and a balance between high heat resistance and good electrical insulation are achieved at 66 mol% BADCy content, where the glass transition temperature reaches 215 °C, which is 73 °C higher than that of the EP system of anhydride copolymer. The volume resistivity of 1.5 × 10 15 Ω·m and dielectric constant of 3.3 is obtained, indicating excellent electrical insulation and dielectric properties of BADCy/EP. This work provides a facile and efficient strategy to improve the overall properties of EP by optimizing the molecular chain structure.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hongjian Gu,Cheng Liu,Qian Liu,Hang Jia,Yue Qiao,Wenqi Zhao,Yousi Chen,Xigao Jian
High-performance polymers that are both high temperature resistant and soluble is significant for the development of high-tech fields. 4,4′-(Thiobis(4,1-phenylene))bis(phthalazin-1(2H)-one) (T-BDHPZ) monomer is synthesized by an efficient two-step method using inexpensive phenyl sulfide and phthalic anhydride as raw materials. A series of novel poly(bisphthalazinone thioether sulfone ketone)s (PBPTSKs) were synthesized via aromatic nucleophilic substitution polycondensation. The structures of PBPTSKs were characterized by NMR and FT-IR. These polymers have glass transition temperatures ( T g s ) in the range of 302–328 ℃, and are soluble in N -methyl-2-pyrrolidone (NMP), pyridine (Py) and 1,1,2,2-tetrachloroethane (TECT), and partially soluble in N , N -dimethylacetamide (DMAc), N , N -dimethylformamide (DMF), dichloromethane (DCM), trichloromethane (TCM) and pyridine. PBPTSK films were prepared by solution casting, and the average light transmittance from 400 to 800 nm of films are all over 70%. PBPTSK boards prepared by hot press molding have outstanding mechanical properties with the tensile strength and the flexural strength of 91–102 MPa and 123–135 MPa, respectively. PBPTSK boards also exhibit excellent high- and low-temperature resistance properties at 290 and −60c, respectively. Moreover, these polymers with bisphthalazinone thioether moiety have outstanding inherent flame retardancy, which pass the V-0 level of the UL-94 test. This provides opportunities to develop high-performance polymers that are both high temperature resistant and soluble, showing great prospects in frontier applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2025
·
IF 11.6
Min Chao,Bei Zhang,Jiahua Yang,Chunjia Luo,Chaobo Liang,Luke Yan
The electromagnetic absorption properties of single optimized wave-absorbing materials limit their practical applications in complex environments such as aerospace and military protection. Therefore, it is of great significance to develop composite materials that combine high temperature resistance, flame retardancy and other properties with efficient wave-absorbing properties. In this study, MXene/CB/PI (MCP) aerogels were successfully prepared by using polyimide (PI) as the polymer matrix and carbon black (CB) and MXene as the conductive fillers. The porous structure of the aerogel enhances the multiple reflections and propagation path length of electromagnetic waves. The conductive network facilitates the conversion of electromagnetic waves into electric currents for efficient conductive loss and multiple heterogeneous interfaces enhance the interfacial polarization. Therefore, the prepared MCP aerogel has excellent microwave absorption properties, with a minimum reflection loss (RL min ) of −56.3 dB and an effective absorption bandwidth (EAB) that completely covers the X-band (4.2 GHz). In addition, MCP aerogel also exhibits: excellent thermal stability (Weight loss is only noticeable above 520 °C), good flame retardancy (LOI up to 43.7 %) and good hydrophobicity (water contact angle of about 110°). MCP aerogel materials combine multiple functions and are expected to play an important role in aerospace and other fields.
研究领域:
材料科学
·
高分子化学
·
功能材料
·
电磁学
·
防火安全工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2018
·Vol. 25
·期 2
·1-13
·
IF 1.434
Cheng Chuanjie,Li Jin,Yang Fanghong,Li Yupeng,Hu Zhongyu,Wang Jinglan
A novel small molecule 1,3-bis(eugenyl) glycerol diether is synthesized from renewable eugenol and epichlorohydrin in 60% total yield, and its structure is confirmed by 1 H–NMR spectrum. Then, this small molecule is utilized to prepare oligomer, linear polymer and the corresponding crosslinked polymer (denoted as P
2
) by using thiol-ene and thiol-oxidation reactions. The polymer P
2
can form brown film on a glass substrate and can be easily put off from the substrate. Mechanical properties of P
2
show that tensile strength value is about 6 MPa, with elongation at break of around 300%. Glass transition temperature (Tg) of P
2
is −2.76 °C, meaning that P
2
is at rubber state. There are hydroxyl groups in the prepared linear polymer, which further reacts with 1,6-hexanediisocyanate (HDI) to form polyurethane P
4
with crosslinked structures. Compared with P
2
, the polyurethane P
4
forms yellow film on a glass substrate. But the film of P
4
is not so flexible as that of P
2
, presumably because of relatively higher Tg (5.85 °C) of P
4
than P
2
. Due to the existence of dynamic disulfide bonds as well as hydrogen bonds in both P
2
and P
4
, these thermoset resins show repeatable self-healing behavior stimulated by UV irradiation. Furthermore, the polyurethane P
4
exhibits ultrahigh temperature resistance performance, with Td 5 = 375 °C and Td 10 = 1000 °C according to TGA curve. This work is expected to expand research and potential applications of the renewable resource eugenol in preparation of smart materials.
研究领域:
高分子材料
·
绿色化学
·
智能材料
·
功能材料
·
自修复材料
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Chaochao Cao,Jingwen Yang,Shaobo Yang,Wenjuan Bai,Dong Wang,Song Yan,Yanming Xue,Xiongwei Qu,Chengchun Tang
Hexagonal boron nitride ( h -BN) materials with excellent physicochemical stability and processibility have been considered as promising engineering materials . However, their practical applications are rather limited by the difficulty in constructing the well-bonded h -BN ceramic. Herein, we present a reaction welding strategy for facile preparation of well-bonded h -BN fibers (BNFs) network by using ethanolamine (ETA) containing alcoholic hydroxyl and primary amine groups as crosslinking agent. The formed >B-O-H 2 C-H 2 C-H 2 N|→B< bond bridges through the esterification and intramolecular coordination (N|→B) reactions between ETA molecules and BNFs containing surface hydroxyls, play an essential role in the construction of the thermodynamically stable >B-N-B< covalent bond between BNFs. Based on this synthetic strategy and a room-temperature molding process followed by a calcination step, a series of resilient BNFs ceramics with high processibility, typical diamagnetism, low dielectric constant (∼ 2.1) and loss, good resistance to temperature different, corrosion, oxidation and abrasion are produced. Besides, they also exhibit excellent strain and damage tolerance, the maximum compression strain and strength can reach up to 38% and ∼ 33 MPa, respectively. Significantly, the deliberately designed BNFs vessel can be successfully used for the alloying of high melting point metals, showing both structural/chemical robustness and good reusability. This ingenious design for well-bonded BNFs network not only is a good model for exploring the welding way for h -BN powders, but also opens up numerous opportunities for practical applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）