JOURNAL OF POLYMER RESEARCH
·
2014
·Vol. 21
·期 12
·1-8
·
IF 1.897
Sun F. M.,Xu W. F.,Chen M. S.,Zhang F. A.
A series of polymerized high internal phase emulsions (polyHIPEs) with different cavities and windows (named PSD) were used as microreactors. Then methyl methacrylate (MMA) was polymerized in the spaces of the polyHIPE by reverse atom transfer radical polymerization (RATRP). The resulting materials and PMMA in the polyHIPEs were characterized by scanning electron microscopy, gel permeation chromatography, Fourier transform infrared spectroscopy, thermogravimetry, hydrogen nuclear magnetic resonance and differential scanning calorimetry. The results suggest that the monomer MMA is polymerized in the PSDs by RATRP. The confinement effect of the different cavities and pores is obvious but it weakens with the increase of the pore size. Compared with the conventional PMMA by RATRP, the number-average molecular weight and temperature of the initial decomposition of the PMMA obtained from PSDs is significantly high, which suggests that the confined space in the PSDs plays an active role in RATRP.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
Biosensors-Basel
·
2026
·Vol. 16
·期 6
·303
·
IF 6.2
Yu Chen,Lina Dong,Hengyan Tian,Fei Yang,Dengbang Jiang,Minglong Yuan
Magnetic polymeric microspheres are pivotal solid-phase carriers in chemiluminescence enzyme immunoassays (CLEIA). However, their practical clinical application is frequently hindered by non-specific adsorption, irreversible aggregation, and the intrinsic susceptibility of exposed outermost Fe3O4nanoparticles to oxidation. To overcome these critical bottlenecks, we rationally engineered highly original monodisperseP(St-MMA)@Fe3O4@P(St-MMA) sandwich-structured microspheres. The bespoke amphiphilic outer shell acts as an impenetrable shield against hydration and oxidation, while maintaining a topologically size-matched mesoporous network (average pore size of 13.11 nm) for optimal antibody anchoring. Strikingly, this architecture ensures exceptional long-term colloidal stability, completely preventing macroscopic agglomeration for over six months in buffer solutions. When evaluated in a carcinoembryonic antigen (CEA), CLEIA, our microspheres achieved an ultra-low limit of detection (LOD) of 0.055 ng·mL−1and high analytical recovery (93.37–108.25%). In a head-to-head comparison with industry-standard commercial magnetic beads, the engineered microspheres delivered stronger chemiluminescent signals and lower background noise, demonstrating excellent intra-assay (CV < 4.37%) and inter-assay (CV < 10%) precision. This work establishes a scalable, highly stable materials platform that effectively resolves the persistent oxidation limitations, holding immense practical importance for next-generation ultrasensitive clinical in vitro diagnostics.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 13
·5808-5821
·
IF 4.5
Wu Wei,Wang Yueming,Sun Jiyu
Color changing can immediately activate system of vision, which bring corresponding monitoring function without delay. Traditional color-changing sensor is not competent for the detection of large area, low-cost and easy preparing. Inspired by adaptive coloring strategies of beetle elytra, angle dependent and humidity responsive color-changing films are achieved with large area through convenient and low-cost technics of spin-coating and self-leveling. When observed at different angles, L 2B , L 2P and L 3G acquired with NPAM and HEMA-co-MMA layers can bring color-changing expect L 3P . And L 3G also conducts humidity responsive color-changing with stability from green to purple in variation from 46%rh to 84%rh and reversibly changing from purple to green while from high to low humidity, which ascribed to transformation between dehydration and hydration of NPAM layer with hydrophilic groups. To characterize the durability and stability in microscale, nano-indentation technology was used to reveal the nanomechanical properties of cross-link networks for NPAM and HEMA-co-MMA films. It was found out that the hydrophilic groups of networks can carry hydrogen bonds to enhance cross-link characteristic and low separation performance. This research provides insights into the simple and efficient technology for preparing functional material that displays potential applications in industrial, agricultural and military fields. Graphical Abstract
研究领域:
材料科学
·
仿生学
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DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2017
·
IF 0.963
Min-Jie Zhou,Mang Lu,Guo-Xiang Wang,Li-Chao Liu,Hu Wu,Wen-Yuan Xu
In this study, reduced grapheme oxide (RGO)/BiVO4 composite was prepared and characterized by FT-IR, XRD, and UV spectrum. Photo-chemically-mediated atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) was successfully performed at 25°C in N,N-dimethylformamide (DMF) with RGO/BiVO4 as photoinitiator, FeCl3·6H2O/triphenylphosphine (PPh3) as catalyst, and ethyl 2-bromoisobutyrate as ATRP initiator. MMAs were polymerized in a controlled manner under ultraviolet (UV) light and sunlight conditions. The results show that a first-order kinetics model was obeyed up to higher conversion. The reaction gave well-controlled PMMA with Mn,GPC close to the theoretical value and a narrow MWD (Mw/Mn<1.5). The experiments of light on and off reveal the photoredox cycle between Fe(III) and Fe(II) species. The living character was further verified by the chain extension experiments.
研究领域:
高分子化学
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光氧化还原催化
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材料科学
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纳米复合材料
·
可控自由基聚合
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DOI
高影响因子
IRANIAN POLYMER JOURNAL
·
2017
·Vol. 26
·期 3
·205-211
·
IF 1.422
Zhou Min-Jie,He Fang,Wu Hu,Wang Guo-Xiang,Liu Li-Chao,Xu Wenyuan
Fe-mediated photo-induced atom transfer radical polymerization (ATRP) of methyl methacrylate was studied with chlorophyll A as photoredox catalyst in the absence of ligands. This is the first report on photo-induced and FeBr 3 -mediated ATRP. A low-cost and environmentally friendly ATRP is provided in this system. A good linear semi-logarithmic plot of polymerization kinetics is the first-order time conversion, and narrow molecular weight distributions explain the well-controlled behavior. The measured number average molecular weight, M
n,GPC (determined by gel permeation chromatography), is increased with monomer conversion, and it is in good agreement with the theoretical values ( M
n,th ). The effect of FeBr 3 is studied with respect to the polymerization. The values of the resultant PMMA increased with reduced FeBr 3 concentration. In this system, the effect of periodic light/off process has been investigated through chain growth instantly turned on and off in response to the visible light. The polymerization was controllable even though the concentration of Fe-based catalyst was dropped to 4 ppm. The chain-end group having a functionality in the synthesized poly(methyl methacrylate) was characterized by nuclear magnetic resonance spectrometry ( 1 H NMR). However, chain extension experiments show reserved chain-end functionality in the synthesized polymers and further confirm the “living” feature of the Fe-mediated photo-induced atom transfer radical polymerization.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
CHEMICAL PAPERS
·
2023
·Vol. 77
·期 7
·3713-3726
·
IF 2.2
Xue Tao,Wei Yan,Yu Caili,Zhou Zhongqun,Zhang Faai
A series of mesoporous silica (MS) materials, including rod-like and spherical SBA-15, spherical MCM-41, and MCM-48, was successfully synthesized and modified by silane coupling agent γ-aminopropyltriethoxysilane. The modified MS was utilized as a microreactor for solution reversible addition–fragmentation transfer (RAFT) polymerization of methyl methacrylate (MMA) using xanthate as a chain transfer agent and azodiisobutyronitrile as an initiator. Notably, modified MS had a low specific surface area and pore volume while maintaining the original morphological structure. Given to the confinement effects, poly(methyl methacrylate) (PMMA) prepared from internal mesoporous channels had higher molecular weight and initial thermal decomposition temperature than those from conventional RAFT polymerization. Moreover, PMMA obtained from spherical SBA-15 and modified MCM-48 exhibited the highest molecular weight ( M n = 8.78 × 10 4 and M n = 7.43 × 10 4 , respectively). This work provided a novel approach in designing a polymer microstructure for a more comprehensive application, such as in drug release. Graphical abstract
研究领域:
材料科学
·
高分子化学
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Ya-Lan Yu,Ming-Xin Zhao,Xue-Ru Cao,Tong-Xiao Zhou
Monodisperse macroporous poly(methyl methacrylate- hydroxyethyl methacrylate) (poly(MMA-HEMA)) microspheres have been successfully prepared by microfluidic methods. In our experiment, numerous fine water droplets were at first fabricated by homogeneous emulsification method and were then evenly dispersed inside monodisperse poly(MMA-HEMA) microspheres as porogens by using a combination of the microfluidic emulsification and the free-radical polymerization method. The embedded fine water droplets within the poly(MMA-HEMA) microspheres resulted in highly controllable uniform porous structures. Fourier transform infrared (FT-IR) spectrometer and scanning electron microscopy (SEM) were employed to examine the chemical compositions and microstructures of the microspheres. The effects of porogen quantity on the macroporous structures have been investigated systematically. The macroporous microspheres samples showed superior adsorption performance. With a water-in-oil type emulsion (water-to-oil volume ratio = 40%) used as the porogen, the microporous microspheres adsorbed 3.18 and 2.80 times their own weight of oil in diesel and in ethylene glycol dimethacrylate (EGDMA), respectively, and the adsorption capacity of microspheres remained unchanged by repeating the process five times. The large adsorption capacity for oil and good reusability of the macroporous microspheres make them attractive when applied in the separation of water and oil.
研究领域:
材料科学
·
环境工程
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DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2024
·
IF 3.9
Hao Yanjun,Zheng Xuecheng,Fan Wei,Chen Siqi,Ye Zhongbin,Tai Lei
In view of the extremely developed bedding of shale formations, which are dominated by micro-nano pores and fractures, traditional sealing agents make it difficult to produce a tight seal on shale formations due to their huge particle sizes. Combining the bridging effect of inorganic nanoparticles and the deformation properties of organic particles, this article synthesized a core-shell structure nano-blocking agent through emulsion polymerization, which was called P(MMA-St-BD)/KH570-SiO 2 . The structure of the synthesized nano-plugging agent was characterized utilizing Fourier transform infrared spectroscopy (FT-IR), particle size distribution, thermogravimetric analysis (TGA), and transmission electron microscopy (TEM). Performance characterization was carried out through the effect of nano-blocking agents on emulsion stability, rheological properties, microporous filter membrane plugging experiments, and core pressure-bearing capacity tests. The findings demonstrate that P(MMA-St-BD)/KH570-SiO 2 ’s structure satisfies design specifications, and that the nano-plugging agent has outstanding thermal stability, homogeneous particle size distribution, and good dispersion. Its decomposition temperature also exceeds 400 °C. This study analyzed the plugging efficiency of nano-blocking agents from the temperature perspective, indicating that the nano-blocking agents seal shale formations tightly. Ultimately, through mechanism analysis, nanomaterials can squeeze and deform through the polymer shell and enter the shale micropores and micro-cracks for sealing, forming a high-strength sealing zone.
研究领域:
材料科学
·
石油工程
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DOI
高影响因子
JOURNAL OF POLYMER ENGINEERING
·
2022
·Vol. 42
·期 4
·343-350
·
IF 1.624
Yashu He,Zhenyang Wang,Fengyu Wen,Igor S. Sirotin,Jianxin Mu,Vyacheslav V. Kireev
In this study, the application of methyl methacrylate (MMA) resin as the binder and standard sand as the aggregate has been employed to prepare the repair materials that can be cured in the sub-zero temperature environment. For this purpose, the redox initiation system of benzoyl peroxide (BPO) and N,N-dimethyl-p-toluidine (DMPT) has been used. Subsequently, the influence of initiator and accelerator content on the compressive strength, flexural strength, curing time and other properties of the materials has been revealed. At an ambient temperature of 0 °C, with BPO = 4.5% and DMPT = 3.5%, the developed repair materials can be cured within 31 min, and the 1 h compressive strength reaches 84.6 MPa. At an ambient temperature of −25 °C, with BPO = 4% and DMPT = 5%, the repair materials can be cured within 43 min, with the 1 h compressive strength reaching 53.4 MPa. The materials can be swiftly cured at low-temperature and exhibit excellent mechanical properties, thus, confirming their suitability for extreme environments. Fourier transform infrared spectrometry (FT-IR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and other techniques have been employed to characterize the developed materials.
研究领域:
土木工程
·
材料科学
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DOI
高影响因子
Journal of Coatings Technology and Research
·
2024
·
IF 2.3
Wang Shuai,Tang Baoling,Lu Jiehong
Nonionic polyacrylate (NPA) emulsions were synthesized through emulsion polymerization employing methyl methacrylate (MMA), lauryl methacrylate (LMA), butyl acrylate (BA), hydroxypropyl acrylate (HPA), acrylamide (AM), acrylic acid (AA), and N-hydroxyethyl acrylamide (NHEMAA) for raw materials. Later, some additives were mixed into the emulsion to create a printing coating which was used for digital inkjet printing on fabric surfaces. The effects of different MMA/LMA ratios on the properties of NPA emulsions were discussed and analyzed. In addition, the particle morphology, chemical structure, and surface morphology of the printed coatings of NPA emulsions were also characterized. The results showed that the highest absolute value of zeta potential and the most stable and relatively good properties of the emulsions were obtained at a ratio of 3:2 MMA/LMA. As the ratio of MMA/LMA increased, the screen blocking performance decreased, and the color intensity, rubbing fastness, and washing fastness all improved. Furthermore, the addition of NHEMAA improved the application performance of the printing coating. The optimal application performance of the printing coating, made from NPA emulsion, was achieved when using a MMA/LMA ratio of 3:2 and adding 2 wt% NHEMAA.
研究领域:
材料科学
·
印刷技术
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DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2010
·
IF 3.858
Sude Ma,Guolin Song,Wei Li,Pengfei Fan,Guoyi Tang
Microencapsulated phase change material (MEPCM), paraffin, with polymethylmethacrylate shell was prepared by introducing UV irradiation to an O/W emulsion polymerization for approximately 30 min under constant stirring. The results of differential scanning calorimetry analyses indicate that the latent heat and the content of paraffin of microcapsules are 101 J g −1 and 61.2 wt%, respectively. The phase transition temperature of MEPCM ranges from 24 to 33 °C. The MEPCM was characterized using scanning electron microscopy and Fourier transform infrared spectroscopy. Thermal gravimetric analysis results show that the MEPCM is degraded into two distinguishable steps. Accelerated thermal cycling tests also indicate that the MEPCM displays a good thermal reliability. Gypsum boards composed of as-prepared MEPCM show a good temperature-regulated property. Based on all these results, it can be concluded that the microencapsulated paraffin as MEPCMs have good potential for thermal energy storage purposes such as phase change material slurries, solar space heating applications, textiles and building materials .
研究领域:
材料科学
·
能源存储
·
建筑技术
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产品关联
DOI
高影响因子
POLYMER SCIENCE SERIES A
·
2017
·Vol. 59
·期 5
·708-717
·
IF 0.822
Zhang Q. L.,Tian X. H.,Sun J. Y.,Yuan Y. Z.,Zhang K. T.
Nanoparticles including starch- graft -methylmethacrylate, starch- graft -(methylmethacrylate/methyl acrylate), starch- graft -(methyl methacrylate/butyl methacrylate) were synthesized via emulsifier-free emulsion polymerization and were blended with natural rubber latex at various mass ratios. Chemical structure of graft copolymers was confirmed by Fourier transform infrared. Transmission electron microscopy demonstrated the core-shell structures of the nanoparticles distributed uniformly around the natural rubble particles. The tensile strength of blend films was significantly enhanced by addition of graft copolymers. Besides, scanning electron microscopy and atomic force microscopy showed the blend film had smooth surface.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）