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Effect of AMPS(2-acrylamido-2-methylpropane sulfonic acid) content on the properties of polymer gels

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Petroleum Science 2022年第2期19卷 697-706页

作者： Tian-Ci Zhang Ji-Jiang Ge Hao Wu Hong-Bin Guo Bao-Lei Jiao Zhen Qian School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina Petroleum Engineering Institute Northwest Branch of SinopecUrumqi830011XinjiangChina

The BST oilfield in the northwestern Taklamakan Desert is a fractured carbonate reservoir,but issues of water breakthrough are becoming increasingly severe with the development of water ***,the high-temperature and high-salt conditions(130°C,71695 mg/L)of the BST oilfield pose challenges for the development of plugging *** this study,the effects of 2-acrylamido-2-methylpropane sulfonic acid(AMPS)content on AM/AMPS copolymers and gels were studied through viscosity measurements,nuclear magnetic resonance(NMR),and cryo-scanning electron microscope(Cryo-SEM).Moreover,the AMPS stabilization mechanism of the polymers and gels was *** and salt-tolerant gel systems were developed,and their gelation properties,thermal stability,injection capacity,and plugging ability were *** results showed inconsistencies between the effects of AMPS content on the polymers and *** the polymers,the thermal stability increased with increased AMPS content in the ***,excessive AMPS content resulted in poor gelation and low *** developed gel systems with S30 polymer(AMPS content is approximately 26%)exhibited excellent thermal stability,controllable gelation time,good injection capacity,and plugging *** field application results indicated that most production wells had a positive response,with reduced water-cut and increased daily oil production.

关键词： gels 2-Acrylamido-2-methylpropane sulfonic acid Enhanced oil recovery Hydrolysis Syneresis

Nonlinear dynamics of self-oscillating polymer gels

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Science China(Technological Sciences) 2010年第7期53卷 1862-1868页

作者： WANG PengFei1, ZHOU JinXiong1, LI MeiE2, XU Feng1,3 & LU TianJian1 1 Biomedical Engineering and Biomechanics Center, SV Laboratory, Xi’an Jiaotong University, Xi’an 710049, China 2 School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China 3 HST Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, 510660, USA 1. Biomedical Engineering and Biomechanics Center SV Laboratory Xi’an Jiaotong University Xi’an 710049 China2. School of Materials Science and Engineering Xi’an Jiaotong University Xi’an 710049 China3. HST Center for Biomedical Engineering Department of Medicine Brigham and Women’s Hospital Harvard Medical School Boston 510660 USA

Self-oscillating polymer gels driven by Belousov-Zhabotinsky (BZ) chemical reaction are a new class of functional gels that have a wide range of potential applications (e.g., autonomously functioning membranes, actuate artificial muscles). However, the precise control of these gels has been an issue due to limited investigations of the influences of key system parameters on the characteristics of BZ gels. To address this deficiency, we studied the self-oscillating behavior of BZ gels using the nonline-ar dynamics theory and an Oregonator-like model, with focus placed upon the influences of various system parameters. The analysis of the oscillation phase indicated that the dynamic response of BZ gels represents the classical limit cycle oscillation. We then investigated the characteristics of the limit cycle oscillation and quantified the influences of key parameters (i.e., ini-tial reactant concentration, oxidation and reduction rate of catalyst, and response coefficient) on the self-oscillating behavior of BZ gels. The results demonstrated that sustained limit cycle oscillation of BZ gels can be achieved only when these key pa-rameters meet certain requirements, and that the pattern, period and amplitude of the oscillation are significantly influenced by these parameters. The results obtained in this study could enable the controlled self-oscillation of BZ gels system. This has several potential applications such as controlled drug delivery, miniature peristaltic pumps and microactuators.

关键词： Belousov-Zhabotinsky reaction self-oscillating gels numerical simulation limit cycle parameter analysis

Versatile Inorganic Oligomer-based Photochromic Spiropyrane gels

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Chinese Journal of Structural Chemistry 2022年第5期41卷 37-47页

作者： Jiajia Song Wei Duan Yun Chen Xiangyang Liu State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China College of Ocean and Earth Sciences College of MaterialsCollege of Physical Science and TechnologyState Key Laboratory of Marine Environmental Science(MEL)Research Institute for Biomimetics and Soft MatterXiamen UniversityXiamen 361005China Department of Physics National University of Singapore2 Science Drive 3Singapore 117542Singapore

Here we report an example of a general strategy for the immobilization of various different photochromic spiropyran molecules on eco-friendly cheap *** spiropyrans are encapsulated in calcium salt oligomers-based gels by centrifugation,forming an inorganic oligomer-based gelatinous photoswitchable hybrid ***^(2+)is also used to regulate the optical properties of spiropyrans through *** oligomer-based gel can not only provide the space required for photoisomerization,but also reduce the interference of the surrounding environment on the photochromic ***,a practical paper-based and colloidal flexible substrate platform is constructed for the removal and naked-eye detection of liquid and gaseous hydrazine at room temperature based on the reactivity of the formyl group on spiro-pyrans loaded in Ca3(PO4)2 *** general strategy can be used for other inorganic oligomer-based molecular switches and sensing systems.

关键词： inorganic oligomer photochromic gels naked-eye detection of hydrazine

All-small-molecule dynamic covalent gels with antibacterial activity by boronate-tannic acid gelation

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Chinese Chemical Letters 2020年第3期31卷 869-874页

作者： Xuejing Cheng Mengyu Li Hui Wang Yiyun Cheng Shanghai Key Laboratory of Regulatory Biology School of Life SciencesEast China Normal UniversityShanghai 200241China South China Advanced Institute for Soft Matter Science and Technology South China University of TechnologyGuangzhou 510640China

Reversible boronate-catechol linkage was widely used to construct two-dimensional coatings and threedimensional nanostructures or *** construction of these functional materials usually requires the pre-synthesis of macro molecular building blocks,and direct gelation between natural polyphenols and small molecule boranic acids is yet to be *** this study,we fabricated a family of allsmall-molecule dynamic covalent gels consisting of tannic acid and boronic *** and thixotropic gels were formed by boronate affinity towards catechol groups abundant on natural *** gels showed multi-responsiveness,such as acid-,base-,reduction-and oxidantsensitive depending on the used boronic acid building *** chemistry for gel formation and stimuli-responsiveness was characterized by11B NMR *** multi-stimuli responsiveness,green processing and facile modular design make the boronic acid-tannic acid gels promising candidates for the development of smart soft materials.

关键词： Nature polyphenols Boronic acids Hydrogels Boronate-catechol complexation All-small-molecule dynamic covalent gels

Tetrathiafulvalene (TTF)-based gelators:Stimuli responsive gels and conducting nanostructures

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Science China Chemistry 2011年第4期54卷 596-602页

作者： YANG XingYuan ZHANG DeQing ZHANG GuanXin ZHU DaoBen 1Beijing National Laboratory for Molecular Sciences Organic Solids LaboratoryInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Graduate University of Chinese Academy of Sciences Beijing 100049China

Tetrathiafulvalene (TTF) and its derivatives have been intensively investigated for conducting materials for more than 30 *** π-electron donors,TTF and its derivatives can be reversibly transformed into the respective TTF.+ and TTF2+.Due to its reversible feature,the TTF unit has been widely employed as the building block for switchable *** recent years studies of conducting nanostructures of TTF derivatives have received more and more *** simple way to prepare nano-structures is through the gelation *** this review,we have discussed recent progress in stimuli-responsive gels and conducting nanostructures based on TTF-based gelators.

关键词： tetrathiafulvalene gelator self-assembly gels conducting nanostructures

Exploration of structure and mechanism of insoluble gels formed in microwave-assisted Suzuki coupling for poly(9,9-dihexylfluorene)s

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Science China Chemistry 2012年第5期55卷 844-849页

作者： ZHANG WenSi LU Ping WANG ZhiMing MA YuGuang State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China

A series of poly(9,9-dihexylfluorene)s (PDHFs) have been synthesized via microwave-assisted Suzuki and Yamamoto coupling reactions. Compared with the conventional oil-bath heating (48 h, Mw 20100 g/mol by Suzuki reaction and Mw 24000 g/mol by Yamamoto reaction), microwave-assisted polymerization can yield PDHFs with higher molecular weights (Mw 37200 g/mol by Suzuki reaction and Mw 43400 g/mol by Yamamoto reaction) in shorter time (14 and 60 min). However, sometimes formation of insoluble gels was observed together with PDHF in Suzuki coupling reaction. PDHF and insoluble gels were analyzed by XPS, elemental analysis, FTIR, TGA and DSC. Experimental results demonstrated that H2O might take part in the Suzuki coupling reaction under microwave condition, which could make the cross-linking reaction occur and form gels.

关键词： microwave Suzuki Yamamoto PDHF gels

Controlled Synthesis of Proton-Conductive Porous Organic Polymer gels via Electrostatically Stabilized Colloidal Formation

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CCS Chemistry 2024年第7期6卷 1767-1775页

作者： Bin Chen Yifeng Kuang Lu Liu Linkun Cai Zaoming Wang Panchao Yin Liangbin Huang Cheng Gu State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and DevicesSouth China University of TechnologyGuangzhou 510640 College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065 Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510641 South China Advanced Institute for Soft Matter Science and Technology South China University of TechnologyGuangzhou 510640 Institute for Integrated Cell-Material Sciences Institute for Advanced StudyKyoto UniversityKyoto 606-8501

Porous organic polymers(POPs)have attracted extensive interest due to their structural diversity and predesigned ***,the majority of POPs are synthesized as insoluble and unprocessable powders,which greatly impede their advanced applications because of limited mass transport and inadaptation for device ***,we report a controlled synthetic strategy of macroscopic POP gels by a cation-stabilized colloidal formation mechanism,which is widely adaptable to a large variety of tetra-/tri-amino build blocks for the synthesis of Tröger’s base-linked POP gels,aerogels,and ionic *** POP gels combined the integrated advantages of hierarchically porous structures and tailorable mechanical stiffness,whereas they could load substantial amounts of phosphoric acids and construct unimpeded transport pathways for proton conduction,exhibiting unprecedented proton conductivity at subzero *** strategy offers a new solution to the intractable processing issues of POPs toward device applications with cutting-edge performances.

关键词： porous organic polymers Tröger’s base linkage gels superprotonic conduction subzero temperatures

gels技术在光交换以太网中的应用(本期优秀论文)

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光通信技术 2009年第12期33卷 22-25页

作者：周宇范红南京邮电大学光电工程学院南京210003

具有层次化分割思想的运营商骨干网传输(PBT)技术,实现了数据平台和控制平台的分离。为了解决PBT缺乏完善的控制、管理等相关功能的不足,探讨了将GMPLS Ethernet Label Switching (gels)技术应用至光交换以太网的设想,提出了gels在PBT... 详细信息

具有层次化分割思想的运营商骨干网传输(PBT)技术,实现了数据平台和控制平台的分离。为了解决PBT缺乏完善的控制、管理等相关功能的不足,探讨了将GMPLS Ethernet Label Switching (gels)技术应用至光交换以太网的设想,提出了gels在PBT中应用的初步方案。

关键词：电信级以太网 gels PBT 多粒度光交换

The Principle of Polysaccharide gels

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Advances in Bioscience and Biotechnology 2015年第1期6卷 22-36页

作者： Masakuni Tako Department of Subtropical Bioscience and Biotechnology University of the Ryukyus Nishihara Okinawa Japan Present Address: Health and Longevity Research Laboratory Integrated Innovation Research Center University of the Ryukyus Nishihara Okinawa Japan

For several decades attention has been directed to natural polysaccharide gels and synthesized polymer gels. The structure-function relationships at molecular level in water of polysaccharides, κ-carrageenan, ι-carrageenan, agarose (agar), and gellan family of polysaccharides (gellan, welan, rhamsan, S-657, deacetylated rhamsan and native gellan gum), which are industrially useful polysaccharides extracted from family of red seaweeds and bacteria, in principle are discussed on the view point of rheological aspects. The polysaccharide molecules (0.1% - 1.0%) play a dominant role in the center of the tetrahedral cavities occupied by water molecules (99.0% - 99.9%), and the arrangement is similar to a tetrahedral structure in a gelation process. The cage and hydrophobic effect play thermal dynamically dominant role in gelation process which gives lowest entropy to electrons of sugar residues. Though the chemical structure of these polysaccharides similar each other, their rheological (gelling) characteristics are quite different. Many investigations about the gelling properties of the polysaccharides have been undertaken to elucidate the structure-function relationship, but no other researchers have established mechanism at the molecular level. There is consistency in our investigations. Thus, the rheological analysis is one of significant methods for understanding the structure-function relationship of polysaccharides in aqueous media. The discussion provides many important information not only in academic field, but also in industrial one, such as food, cosmetic, pharmaceutical, drug delivery and tissue industries, and biotechnology.

关键词： Polysaccharide gels Principle Gelation Mechanism of Polysaccharides Hydrogen Bonding Ionic Bonding Van der Waals Forces of Attraction