CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Qin Zhang,Guo-Rui Zhu,Xiang-Xin Xiao,Qing-Song Liu,Min Jiang,De-Ming Guo,Hai-Bo Zhao,Wen-Da Li,Li Chen,Bo-Wen Liu,Yu-Zhong Wang
Constructing micro cross-linking structures into molecular chains has demonstrated the ability to improve basic properties, such as mechanical strength and thermal stability, of thermoplastic polymers. However, this method has limitations when it comes to improving the functionality of polymers. Herein, we reported a multifunctional micro cross-linking network that improves not just mechanical strength but also flame retardancy, dielectric properties, battery performance, antistatic properties, etc . A novel phosphinamide-containing monomer was designed, synthesized, and copolymerized into the polymer chain of polyamide 6, a typical thermoplastic polymer. On the one hand, the micro cross-linking structure was successfully obtained through the amide interchange reaction between the side-chain phosphinamide groups and the main-chain amide groups, leading to a 23.7% improvement of tensile strength and largely maintained tensile toughness. On the other hand, the functional phosphorus groups showed an efficient free-radical-capturing effect during fire, endowing the copolymer with excellent flame retardancy at a low monomer content of 2 mol%. Additionally, the copolymer also possessed great spinnability, melt-crystallization performance, as well as dielectric property, antistatic property, and battery performance, enabling its potential in a wide variety of applications.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zhipeng Wang,Yong Qiu,Anqi Liu,Wei Tang,Wang Xi,Jingyu Wang,Lun-Bagen Gao,Lijun Qian
The precise construction of molecular functional systems is an important way to develop high-performance flame retardant polymer composites with excellent comprehensive mechanical properties. A micro-crosslinked macromolecule (PMD) with group aggregation features has been synthesized from vinyl monomers (MD) bearing phosphaphenanthrene and cyclotetrasiloxane groups. The micro-crosslinking polymerization of MD results in superior structural stability and charring capability. PMD not only endows the polycarbonate (PC) composite with excellent comprehensive flame retardant performance, but also maintains the flexural and tensile properties of the PC matrix, as well as an enhanced anti-impact performance. More importantly, when compared with congeneric low molecular weight contrast, PMD exhibits much higher efficiency in suppressing the combustibility of the PC composite. A toughening effect on the matrix was only observed in the PMD/PCs upon increasing the additive content that did not appear in MVCD/PCs, which fractured more easily. 5 %PMD/PC passed the UL94 V-0 rating with a LOI value of 36.3%, and achieved 31.4% higher impact strength, 46.4% lower pk-HRR, 26.7% longer time to pk-HRR, 57.1% lower FGI, 57.7% higher FPI, and 25.6% lower peak of CO production rate when compared with those of the initial sample. The toughening and flame retardant mechanisms of PMD were also revealed upon analyzing the resultant micro-/macro- morphology and chemical components of the char residue, thermal decomposition volatiles, and pyrolytic fragments. These provide a beneficial molecular-structure construction reference for developing high-performance polymer composites with excellent comprehensive performance in both of flame retardancy and mechanical properties.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
High Voltage
·
2025
·
IF 4.9
Hongbo Liu,Lu Cheng,Zhiyuan Li,Jiakai Zeng,Wenfeng Liu,Shengtao Li
In this study, the authors proposed a promising structure design, the micro-crosslinked polypropylene (PP), to enhance the high-temperature energy storage density. With the grafting of 1,6,7,12-tetrachlorinated perylene- N -2-aminoethyl acrylate- N ′-dodecylamine-3,4,9,10-tetracarboxylic bisimide (PTCDA) onto PP molecules, the obtained PP-g-PTCDA achieved a superior energy storage density of 2.34 J/cm 3 at 120°C with the discharge efficiency above 90%, which was 585% higher than that of neat PP. The great enhancement, on the one hand, originated from the micro-crosslinked structure, since the restricted molecular motion can lead to the suppression of electrons' hopping across the molecular chains. On the other hand, deep traps were also introduced in PP-g-PTCDA, which restricted the electrons' hopping along the molecular chains simultaneously. This work provided an orientation to enhance the energy storage density at an elevated temperature of 120°C.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Gels
·
2025
·Vol. 11
·期 2
·138
·
IF 5.3
Lifang Song,Chengwen Wang,Jingping Liu,Dingye Li
In order to solve the problem of solid-phase particle settlement of high-density cement paste used in deep/ultra-deep wells, a temperature-responsive micro-cross-linking method was innovatively adopted to increase the viscosity and settlement stability of high-density cement paste at high temperatures. Through the self-developed suspension stabilizer and cross-linking agent to form micro-cross-linking gel at high temperature, the increase in high-temperature viscosity of cement paste was successfully realized without increasing the low-temperature viscosity of cement paste. Moreover, this micro-cross-linking reaction, together with the hydrophobic binding effect of the suspension stabilizer, strengthened the filamentary linkage network structure in the polymer solution with the formation of a lamellar linkage network structure. This effectively compensated for the decrease in viscosity of the polymer solution with increasing temperature. The results show that the micro-cross-linked system can be successfully cross-linked at elevated temperatures of 120–220 °C in pH 8–13 and salt content of 0–10%. The viscosity of the micro-cross-linked system was 144.5 mPa·s after 20 min at 220 °C with a shear rate of 170 s −1 , which was 91% higher than the viscosity of the un-cross-linked system. After curing at 220 °C, the density difference between the top and bottom of the high-density cement was 0.025 g/cm 3 , which was 84% lower than the un-cross-linked system. This helped the high-density cement slurry to maintain the homogeneity of the components at high temperatures and ensured the high-temperature consistency and suspension stability of the slurry. This study helps to improve the cementing effect of deep/ultra-deep wells and provides a new method to solve the problems of cement slurry settlement and destabilization under high-temperature and high-pressure well conditions.
研究领域:
石油工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Quan Yan,Bailiang Xue,Qinyu Zhao,Wenliang Wang,Xinping Li,Yongsheng Zhao,Jialong Wen,Xianzhi Meng,Wei Zhao
The incorporation of lignin into polybutylene succinate (PBS) is considered as a green approach to enhance the mechanical properties, durability, and biodegradability of PBS. However, it often leads to only a limited improvement in the toughness of PBS due to the poor compatibility of lignin with PBS. Herein, we present a novel approach to prepare lignin reinforced PBS composites with fully biobased, ultra-tough and high tensile strength characteristics through reactive extrusion and mold-pressing methodology, involving lignin epoxy vitrimer (LEV), sebacic acid (SA) and PBS. The influences of the LEV content on the structure, mechanical property, morphology, reprocessability, self-healing, creep resistance characteristics of the resultant PBS/LEV composites were systematically investigated. The incorporation of LEV in PBS could induce unique dynamic micro-crosslinked structure within PBS through dynamic transesterification reaction, which offered the resultant PBS/LEV composites with a extraordinary 18 times enhancement in elongation at break and a 13 times enhancement in toughness compared with that of pure PBS. Furthermore, the PBS/LEV composites exhibited excellent reprocessing, self-healing, creep resistance and UV resistance properties. The novel approach provides a potential avenue for enhancing the compatibility between lignin and PBS, which is beneficial for development new brand of lignin-containing fully biobased and biodegradable materials.
研究领域:
材料科学
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生物基材料
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绿色化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Mengyuan Pu,Changqing Fang,Xing Zhou,Tianqi Bai,Yangyang Lin,Wanqing Lei
Recycling of sustainable raw materials from waste poly(ethylene terephthalate) is a promising production path compared to traditional raw materials sourced from limited fossil fuel resources. The renewable resources have potential in preparing polyurethane (PU) pressure-sensitive adhesive (PSA) with high activity and polarity for wide applications. In this work, a novel microcross-linked solvent-free PU adhesive based on a chain extender from glycolysis of waste polyethylene terephthalate (PET) was processed. The adhesive displayed stable adhesion on a variety of substrate materials including steel, plastic, glass, paper, and wood. The adhesive strength on wood substrates can be up to 1.69 MPa, and the 180 peeling strength is 2.75 N/2.5 cm, which is comparable to other PSA made from recyclable resources. The main component of PET glycolysis products (LGOP), bis(2-hydroxyethyl) terephthalate, can cause rapid expansion and cross-linking of the PU chain segment. The PU adhesive demonstrates molecular reconstruction capability, good healing, excellent ductility, and thermal stability due to the presence of the strong polarity and rigid aminoester group and cross-linking. Chang’s viscoelastic windows of Chang’s PU adhesives shifted to quadrant II under high shear pressures, and quadrant V could be used for general-purpose sensitive adhesives. This study presents an environmentally friendly method for producing PU adhesive by recycling waste PET as a key raw material for pressure-sensitive adhesive.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2020
·
IF 4.605
Yufei Yuan,Cuiyan Tong,Changli Lü
ABSTRACT The low ionic conductivity and poor dimensional stability severely influence the application of anion exchange membranes (AEMs). Therefore, how to balance the problem of excessive swelling of polymer matrix caused by increasing ion conductivity becomes an important challenge. Herein, 3-(dimethylamino)-1- propylamine (DMAPA) and polyethyleneimine (PEI) were grafted to the surface of layered double hydroxide (LDH) through mussel-inspired chemistry. The sheet-like functionalized LDH (DLDH and PLDH) as both filler and crosslinker was incorporated into the quaternized fluorenyl-containing polyethersulfone (QPFSU) matrix to get a series of new composite anion exchange membranes (AEMs). The as-prepared micro-crosslinked AEMs were found to form more hydrophilic conductive ion clusters owing to the generation of new quaternary ammonium groups during the crosslinking reaction. The micro-crosslinked AEMs have better dimensional stability while having higher OH − conductivity. Especially the ion conductivity of CQPFSU-1%-PLDH membrane can reach 86.8 mS cm −1 at 80 °C with excellent dimensional and chemical stability (SR is 9.6% at 80 °C, 21.8% decrease in OH − conductivity at 60 °C in 1.0 M NaOH for 200 h). Overall, the micro-crosslinking method for functionalized LDH modified AEMs achieves a balance between ion conductivity and dimensional stability of AEMs.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Xiaokang Yin,Zhicheng Li,Fengxin Chai,Yuan Tian,Yebang Tan,Minggang Wang
A cationic polyacrylamide (PADO) with excellent flocculation performance was synthesized by the inverse emulsion polymerization of acrylamide benzyldimethyl[2-[(1-oxoallyl)oxy]ethyl]ammonium chloride (DBC) and vinyl siloxanes (VTEO). The structure and weight of PADOs were characterized by H NMR spectra and static light scattering. The impacts of the types and amounts of vinyl siloxanes were investigated to optimize the produced flocculant. When more crosslinking groups are present in the added vinyl siloxanes, the synthesized copolymer could achieve larger molecular weights through micro-crosslinking networks, which is beneficial to its flocculation performance. The PAD3O copolymer prepared by VTEO3 monomers with a mole fraction of 1.16% exhibited the best efficiency for oil removal, which balanced the large molecular weight and appropriate water solubility, optimizing the interactions with oily colloids from produced water. The flocculation performance of PADO copolymers prepared in this work has been compared with seven different commercial cationic polyacrylamides by treating simulated produced water. The PADO copolymers exhibited a higher oil removal rate with a lower dosage, which surpassed the performances of all commercial cationic polyacrylamides and successfully achieved high-efficiency water treatment. Moreover, the application performance was further evaluated by treating the practical produced water with complex composition generated from the site of the Bohai K platform. The deoiling rate of practical produced water could achieve 98% after 2 h at room temperature by adding 300 mg/L PAD3O copolymers. This work shows a potential candidate for efficient treatment of oily wastewater and provides an approach for future flocculant design.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qinyong Liu,Xiaowei Su,Jian Liu,Baozhu Wang,Huihui Li,Jun Sun,Hongfei Li,Xiaoyu Gu,Sheng Zhang
The widespread application of polyurea (PUA) in protective coatings typically requires excellent flame retardancy due to real-world usage scenarios. However, the addition of flame retardant additives often compromises the material’s mechanical properties. In this study, a multifunctional reactive additive, MX-SP-NH 2 , was creatively prepared by covalently grafting spirocyclic pentaerythritol bisphosphorate disphosphoryl chloride (SPDPC) onto MXene (Ti 3 C 2 T x ) surfaces, followed by the introduction of 1,3-propanediamine (PDA) by the reaction with SPDPC. MX-SP-NH 2 was then incorporated into PUA, participating in its crosslinking process and significantly enhancing both its mechanical strength and flame retardancy. Compared to the control PUA sample, the micro-crosslinked PUA sample with just 1.0 wt% MX-SP-NH 2 demonstrated a 184.3% increase in tensile strength, a 126.1% increase in elongation at break, and a 436.3% increase in toughness. The flammability characterization revealed that the peak heat release rate, peak smoke production rate, and peak CO production rate were reduced by 31.7%, 28.9%, and 61.5%, respectively, indicating a substantial improvement in fire safety. Additionally, the flame retardant PUA-based flexible strain sensors demonstrated stable electrical signal responsiveness. This work has opened up new potential applications of PUA in flexible electronics.
研究领域:
材料科学
·
聚合物化学
·
防火安全工程
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 33
·16064-16079
·
IF 4.682
Zhang Yang,He Jiyu,Yang Rongjie
A series of novel tetraamino phthalocyanine zinc (TAPcZn) micro-crosslinked polyimide films were successfully synthesized by the copolymerization of 3,3′,4,4′-benzophenone tetracarboxylic dianhydride and 4,4′-oxydianiline. The UV–Vis, FTIR, NMR, MALDI-TOF-MS, and SEM–EDS technologies were used to demonstrate the synthesis of TAPcZn. The copolyimide films were mainly characterized via their morphologies, thermal stability, and mechanical properties. As expected, the copolyimide films inherited the optical properties of phthalocyanine compounds and showed good mechanical properties, excellent thermal stability, and flame retardancy with low content of TAPcZn (< 5.0 wt%), regularly. Smooth, uniform, and defect-free copolyimide films all showed good mechanical properties, and the tensile strength of PI with 1.52 wt% of TAPcZn reached 116.9 MPa, which is 19.7% higher than that of pure PI. In addition, as the amount of TAPcZn increases, both the residue char and the initial decomposition temperature of the copolymer film improved significantly, and the fire resistance of PI showed the same rules according to the limiting oxygen index and UL-94 tests. Amazingly, the obtained copolyimides are π -conjugate macrocycle homogeneous copolymers with excellent low dielectric properties. In particular, the 4.49 wt% TAPcZn/PI film showed an ultra-low dielectric constant of 2.326 (at 1 MHz) and a dielectric loss of less than 0.007. Therefore, the copolyimide films containing TAPcZn are highly prospective candidates as high-performance flexible substrates and dielectrics for electronics devices. Graphical Abstract
研究领域:
材料科学
·
高分子化学
·
电气工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Xiaodong Dong,Jinsheng Sun,Xianbin Huang,Kaihe Lv,Yuan Geng,Fengbao Liu,Zonglun Wang,Xianfa Zhang
ABSTRACT In the process of developing deep oil and gas resources, the problem of high temperature and high salinity in deep strata has become a serious challenge faced by water-based drilling fluids. Under high temperature and high salinity conditions, drilling fluids must maintain good rheological properties to ensure safe and efficient drilling work. In this study, a temperature- and salt-resistant viscosifier (DASL) was synthesized using N, N-dimethylacrylamide, 2-Acrylamido-2-methylpropane sulfonic acid, sodium p-styrene sulfonate, and lauryl methacrylate as monomers with a double backbone structure of micro crosslinking and hydrophobic association structures. The results of pyrene fluorescence probe test and transmission electron microscopy observation showed that DASL has an obvious hydrophobic associative structure. Moreover, due to the presence of microcrosslinked structure, DASL exhibits good shear thinning property and thixotropy in aqueous solution. Under the conditions of 200℃ and 35 wt% NaCl, the apparent viscosity of the drilling fluid with 2 wt% DASL added was 24.5 mPa⸱s, and the filtration was only 9.2 mL. In addition, mechanism studies have shown that the dual skeleton structure of DASL improves its temperature and salt resistance. DASL can adsorb and bridge with bentonite particles, increase the internal friction and structural viscosity of the drilling fluid, enhance the internal mesh structure of the drilling fluid, improve the colloidal stability of the drilling fluid, and maintain a reasonable particle size distribution of the bentonite particles, which enable DASL to significantly increase the viscosity of the drilling fluid while reducing the filtration loss of the drilling fluid. This work demonstrates that polymers with dual skeleton structures of micro crosslinking and hydrophobic association have good application effects as temperature- and salt-resistant viscosifier for water-based drilling fluids.
研究领域:
石油工程
·
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Petroleum Science
·
2024
·
IF 6
Jian Li,Yu-Xi Ji,Xiao-Xiao Ni,Kai-He Lv,Xian-Bin Huang,Jin-Sheng Sun
During ultradeep oil and gas drilling, fluid loss reducers are highly important for water-based drilling fluids, while preparing high temperature- and salt-resistance fluid loss reducers with excellent rheology and filtration performance remains a challenge. Herein, a micro-crosslinked amphoteric hydrophobic association copolymer (i.e., DADC) was synthesized using N,N-dimethyl acrylamide, diallyl dimethyl ammonium chloride, 2-acrylamido-2-methylpropane sulfonic acid, hydrophobic monomer, and pentaerythritol triallyl ether crosslinker. Due to the synergistic effects of hydrogen bonds, electrostatic interaction, hydrophobic association, and micro-crosslinking, the DADC copolymer exhibited outstanding temperature- and salt-resistance. The rheological experiments have shown that the DADC copolymer had excellent shear dilution performance and a certain degree of salt-responsive viscosity-increasing performance. The DADC copolymer could effectively adsorb on the surface of bentonite particles through electrostatic interaction and hydrogen bonds, which bring more negative charge to the bentonite, thus improving the hydration and dispersion of bentonite particles as well as the colloidal stability of the drilling fluids. Moreover, the drilling fluids constructed based on the DADC copolymer exhibited satisfactory rheological and filtration properties (FL HTHP = 12 mL) after aging at high temperatures (up to 200 °C) and high salinity (saturated salt) environments. Therefore, this work provided new insights into designing and fabricating high-performance drilling fluid treatment agents, demonstrating good potential applications in deep and ultradeep drilling engineering.
研究领域:
石油工程
·
材料科学
✓ 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）