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A robust polyacrylic acid/chitosan cryogel for rapid hemostasis

Science China(Technological Sciences) 2022年第5期65卷 1029-1042页

作者： SHI MingYue JIANG LiJie YU ChaoJie DONG XiaoRu YU QingYu YAO MengMeng HE ShaoShuai YUE ZhiWei YAO FangLian ZHANG Hong SUN Hong LI JunJie School of Chemical Engineering and Technology Tianjin UniversityTianjin300350China School of Basic Medical Sciences North China University of Science and TechnologyTangshan063210China Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering Ministry of EducationTianjin UniversityTianjin300350China

Currently,it is a challenge to develop hemostatic materials with high water absorption capacity and anti-fatigue properties for quickly preventing massive hemorrhage from arteries and visceral organs.A series of polyacrylic acid/chitosan(PAA/CS)cryogels were prepared by a cryostructurization technique to improve mechanical performance and hemostatic efficiency of chitosan(CS).In this system,the chemically cross-linked PAA network was used as a framework to improve water absorption behaviors and mechanical *** CS network was co-blended by hydrogen bonding and electrostatic interactions,both of which synergistically promoted *** cryogels had high porosity(>94%),rapid water absorption rate(2000%),outstanding mechanical strength,and fatigue ***,the results of cytotoxicity and hemolysis demonstrated that the cryogels had good ***,the PAA/CS cryogels exhibited superior whole blood coagulation ability and red blood cell and platelet adhesion ability compared to those of commercial hemostatic dressing(gauze,gelatin sponges,and CS sponges).Based on these results,mouse femoral artery hemorrhage models and liver hemorrhage models were prepared to investigate the hemostatic ability of the prepared PAA/CS *** suggested that the hemostatic ability of PAA5/CS cryogels was superior to that of commercial hemostatic ***,the PAA/CS cryogels showed potential application in preventing massive hemorrhage from arteries and visceral organs.

关键词： hemostatic dressing chitosan polyacrylic acid cryogel

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IN SITU INTERFEROMETRIC STUDY ON THE GELATION PROCESS OF polyacrylic acid GELS

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Chinese Journal of Polymer Science 2000年第4期18卷 373-377页

作者： Ying Guan Qiang Chen Xian-min Zhang Yu-xing Peng Jian Xu Polymer Physics Laboratory, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China Department of Information & Electronic Engineering, Zhejiang University, Hangzhou 310027, China Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China Chinese Acad Sci Inst Chem Ctr Mol Sci Polymer Phys Lab Beijing 100080 Peoples R China Zhejiang Univ Dept Informat & Elect Engn Hangzhou 310027 Peoples R China Chinese Acad Sci Chengdu Inst Organ Chem Chengdu 610041 Peoples R China

In situ interferometry was used to investigate the gelation process of polyacrylic acid (PAA) gels. The basic principle of the in situ interferometry technique is illustrated. It can give sufficient information for non-destructive and successful investigation of the whole gelation process. The effect of initiator concentration on the gelation process was studied. The polymerization rate of AA increases with increasing initiator concentration. The error arising from the thermal effect in the gelation process can be neglected.

关键词： in situ interferometry gelation polyacrylic acid

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The Synthesis Technique of polyacrylic acid Superplasticizer

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Journal of Wuhan University of Technology(Materials Science) 2008年第6期23卷 830-833页

作者：张荣国雷家珩 School of Science Wuhan University of Technology

Using water separation technique,acrylic acid （AA） and polyethylene glycol （PEG） 1000,of which the ratio was 1.5,were esterified and the optimum esterification ratio of 90% could be reached under the condition of 110 ℃×3 *** polyoxyethylene acrylate macromonomer （PA） prepared in the esterification,AA and sodium methylacryl sulfonate （MAS） as monomers,a copolymer which could be used as superplasticizer was prepared by free radical coolymerization in n（PA）：n（AA）：n（MAS） of 1：7：*** the synthesis condition was 80 ℃× 5 h,the optimal dosage of initiator was 3.0%-4.0%,the fluidity of cement paste with the samples could reach 270 *** analyzing the effect of the content of residual small molecule sulfonic monomer on the properties of sample,n（MAS）/n（PA） was controlled in a range of 2.5-3.8.

关键词： polyacrylic acid superplasticizer esterification free radical polymerization

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Oxygen self-doping pyrolyzed polyacrylic acid as sulfur host with physical/chemical adsorption dual function for lithium-sulfur batteries

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Chinese Chemical Letters 2024年第7期35卷 473-479页

作者： Yan Wang Huixin Chen Fuda Yu Shanyue Wei Jinhui Song Qianfeng He Yiming Xie Miaoliang Huang Canzhong Lu Engineering Research Center of Environment-Friendly Functional Materials Ministry of EducationInstitute of Materials Physical ChemistryHuaqiao UniversityXiamen 361021China CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstitutesChinese Academy of SciencesXiamen 361021China

Lithium-sulfur(Li-S)batteries with high theoretical capacity and energy density need to solve problems such as the high decomposition energy barrier of Li_(2)S and large volume change of sulfur in the charging process caused by the shuttle effect before practical ***,a green synthesis method is used to prepare polyacrylic acid(PAA)superabsorbent material,and then the pyrolyzed PAA(P/PAA)material is obtained as the positive electrode of Li-S *** functional calculation reveals that the oxygen self-doping pyrolyzed polyacrylic acid(P/PAA)delivered stronger binding energy toward Li2S species in carbonyl C=O than that of graphite powder(GP)which are-1.58 eV and-1.02 eV,*** with the distribution of relaxation time analysis and the in-situ electrochemical impedance approach,it is further demonstrated that the designed P/PAA as sulfur host plays a physical/chemical adsorption dual function in maintaining the stability and rate performance of *** an initial discharge capacity of 1258 mAh/g at 0.1 C and a minimal capacity decline of 0.05%per cycle even after 800 cycles at 0.5 C,the produced cathode demonstrated outstanding electrochemical *** average Coulombic efficiency is nearly 100%.The P/PAA electrodes may typically retain 96%of their capacity while declining on average only 0.033%per cycle after 130 cycles at 3 *** effort provides a new method for the future development of heteroatomic self-doping superabsorbent with promising adsorption properties for polysulfides as cathode materials of Li-S batteries.

关键词： polyacrylic acid Oxygen self-doping Green synthetic Pore mesh polymer cathodes Lithium-sulfur batteries

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A new approach for development of vaccine against visceral leishmaniasis: Lipophosphoglycan and polyacrylic acid conjugates

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Asian Pacific Journal of Tropical Medicine 2017年第9期10卷 877-886页

作者： Adil M.Allahverdiyev Rabia Cakir Koc Melahat Bagirova Serhat Elcicek Serap Yesilkir Baydar Olga Nehir Oztel Emrah Sefik Abamor Sezen Canim Ates Murat Topuzogullari Sevil Isoglu Dincer Zeynep Akdeste Yildiz Technical University Department of Bioengineering Firat University Department of Bioengineering Yeni Yuzyil University Biomedical Engineering Abdullah Gul University Material Science and Nanotechnology Department

Objective: To determine the antileishmanial vaccine effectiveness of lipophosphoglycan(LPG) and polyacrylic acids(PAA) conjugates on in vivo mice ***: LPG molecule was isolated and purified from large-scale Leishmania donovani parasite culture. Protection efficacies of LPG alone, in combination with Freund's adjuvant, in a physical mixture and in conjugate(consisting of various LPG concentrations) with PAA, were comparatively determined by various techniques, such as cultivation with the micro-culture method, assessment of in vitro infection rates of peritoneal macrophages, determination of parasite load in liver with Leishman-Donovan Units, and detection of cytokine ***: Obtained results demonstrated that the highest vaccine-mediated immune protection was provided by LPG-PAA conjugate due to all parameters investigated. According to the Leishman-Donovan Units results, the sharpest decline in parasite load was seen with a ratio of 81.17% when 35 mg LPG containing conjugate was applied. This value was 44.93% for the control group immunized only with LPG. Moreover, decreases in parasite load were 53.37%, 55.2% and 65.8% for the groups immunized with 10 mg LPG containing LPG-PAA conjugate, a physical mixture of the LPG–PAA, and a mixture of LPG + Freund's adjuvant, respectively. Furthermore, cytokine results supported that Th1 mediated protection occurred when mice were immunized with LPG-PAA ***: It has been demonstrated in this study that conjugate of LPG and PAA has an antileishmanial vaccine effect against visceral leishmaniasis. In this respect, the present study may lead to new vaccine approaches based on high immunogenic LPG molecule and adjuvant polymers in fighting against Leishmania infection.

关键词： Leishmania Lipophosphoglycan Vaccine Polymer polyacrylic acid

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Preparation and Properties of pH-Responsive Intelligent Medical Dressing Based on Bacterial Cellulose/polyacrylic acid

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Materials Sciences and Applications 2022年第3期13卷 107-131页

作者： Fei Jiang Wen Zhang Siyu Guo Xin Zhang Shaanxi University of Science & Technology Xi’an China

Bacterial cellulose/polyacrylic acid (BC/PAA) pH-responsive hydrogels were prepared by free-radical polymerization (in situ) using BC as the raw material and AA as the monomer. The hydrogels were loaded with curcumin (Cur) to prepare pH-responsive intelligent medical dressings. The preparation process of the hydrogels was optimized by a single factor and response surface experiment using their swelling degree as an index. The structures of BC/PAA pH-responsive hydrogels were characterized by scanning electron microscope (SEM), Fourier Transform Infrared spectrometer (FTIR), X-ray diffraction (XRD), and tensile tester, and the swelling properties, mechanical properties, bacteriostatic properties, and drug release behavior were investigated. The results showed that the BC/PAA pH-responsive hydrogel has a three-dimensional network structure with the swelling rate up to 1600 g/g, compressive strength of up to 8 KPa, and good mechanical properties, and the drug release behavior was in line with the logistic dynamics model, and it has good inhibitory effects on common pathogens of wound infection: E. coli, S. aureus, and P. aeruginosa.

关键词： Bacterial Cellulose polyacrylic acid In Situ Polymerization pH-Responsive Hydrogel BC/PAA-Cur Intelligent Medical Dressing

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Erosion resistance of treated dust soils based on the combined enzymatically induced carbonate precipitation and polyacrylic acid

Biogeotechnics

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Biogeotechnics 2023年第4期1卷 68-76页

作者： Wang, Hengxing Wang, Junjie Sun, Xiaohao Miao, Linchang Shi, Wenbo WU, Linyu Yuan, Junhao Institute of Geotechnical Engineering Southeast University Nanjing 210096 China Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong School of Intelligent Transportation Xuchang University Xuchang 461000 China School of Civil Engineering and Architecture Wuhan Polytechnic University Wuhan 430023 China

The majority of cities worldwide are grappling with the challenge of dust pollution. Recently, the application potential of enzymatically induced carbonate precipitation (EICP), a novel environmentally friendly method, for dust control has been convincingly demonstrated. However, the long-term durability of EICP treatment is consistently a significant concern, particularly in regions prone to recurrent erosion caused by rainfall. As a result, the erosion durability of the EICP-treated dust soils requires further investigation. To address this, polyacrylic acid (PAA) was added to the cementation solution in this study as the combined PAA and EICP treatment for dust control. The results showed that the addition of PAA slightly affected urea degradation;however, the combined PAA and EICP treatment significantly improved surface strength from 300 kPa to 500 kPa, especially for the wind-erosion resistance compared with the EICP treatment alone. The surface strength of samples treated with the combined PAA and EICP still exhibited a decrease due to repeated rainfall erosion, along with a reduction in calcium carbonate (CaCO3) contents. Nevertheless, the decreasing slopes of surface strength (k = 13.434, 14.002, or 14.186) in response to repeated rainfall for EICP-PAA-treated slopes were much smaller than those for EICP-treated samples (k = 14.271), as well as the decreasing slopes of CaCO3 contents, which suggested the slopes with the combined treatment had significantly improved durability. By comparing the cementation effect and the influence of repeated rainfalls on treated dust samples, the EICP-PAA (50 g/L) treatment achieved better dust control effects. Overall, the combined treatment of EICP-PAA shows promising potential for effectively suppressing dust generation and enhancing erosion durability. © 2023 The Authors

关键词： Crust layer Dust control Enzymatically induced carbonate precipitation Erosion durability polyacrylic acid

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Sprayed PAA-CaO_(2)nanoparticles combined with calcium ions and reactive oxygen species for antibacterial and wound healing

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Regenerative Biomaterials 2023年第1期10卷 1356-1371页

作者： Hong Yu Jiale Sun Kepeng She Mingqi Lv Yiqiao Zhang Yawen Xiao Yangkun Liu Changhao Han Xinyue Xu Shuqing Yang Guixue Wang Guangchao Zang Tissue and Cell Biology Lab Teaching&Management CenterChongqing Medical UniversityChongqing 400016China Chongqing University Central Hospital Chongqing Emergency Medical CenterChongqing 400030China Key Laboratory for Biorheological Science and Technology of Ministry of Education State and Local Joint Engineering Laboratory for Vascular ImplantsBioengineering College of Chongqing UniversityChongqing 400030China Jinfeng Laboratory Chongqing 401329China

The most common socioeconomic healthcare issues in clinical are burns,surgical incisions and other skin *** lesion healing can be achieved with nanomedicines and other drug application *** study developed a nano-spray based on cross-linked amorphous calcium peroxide(CaO_(2))nanoparticles of polyacrylic acid(PAA)for treating skin wounds(PAA-CaO_(2)nanoparticles).CaO_(2)serves as a‘drug’precursor,steadily and continuously releasing calcium ions(Ca^(2+))and hydrogen peroxide(H_(2)O_(2))under mildly acidic conditions,while PAA-CaO_(2)nanoparticles exhibited good spray behavior in aqueous *** demonstrated that PAA-CaO_(2)nanoparticles exhibited low cytotoxicity and allowed L929 cells proliferation and migration in *** effectiveness of PAA-CaO_(2)nanoparticles in promoting wound healing and inhibiting bacterial growth in vivo was assessed in SD rats using full-thickness skin defect and Staphylococcus aureus(***)-infected wound models based *** results revealed that PAA-CaO_(2)nanoparticles demonstrated significant advantages in both ***,the infected rats’skin defects healed in 12 *** benefits are linked to the functional role of Ca^(2+)coalesces with H_(2)O_(2)as known antibacterial and healing-promoted ***,we developed nanoscale PAA-CaO_(2)sprays to prevent bacterial development and heal skin lesions.

关键词： polyacrylic acid calcium peroxide nanomedicines antibacterial wound healing

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DIFFERENT TYPES OF MICROFIBRILLATED CELLULOSE AS FILLER MATERIALS IN POLYSODIUM ACRYLATE SUPERABSORBENTS

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Chinese Journal of Polymer Science 2011年第4期29卷 407-413页

作者： Mikael Larsson Qi Zhou Anette Larssona Department of Chemical and Biological Engineering Chalmers University of Technology 41296 Gothenburg Sweden Wallenberg Wood Science Center Royal Institute of Technology SE-100 44 Stockholm Sweden School of Biotechnology Royal Institute of Technology SE-106 91 Stockholm Sweden

Three types of microfibrillated cellulose （MFC） with differences in structure and surface charge were used at low concentration as filler materials in polysodium acrylate superabsorbents （SAPs）. The swelling of the composite hydrogels was determined in 0.9% NaCl solution as well as in deionized water. The shear modulus of the samples was determined through uniaxial compression analysis after synthesis and after swelling in 0.9% NaC1 solution. Furthermore, the ability to retain filler effects after washing was investigated. The results showed that all of the investigated MFCs had a strong reinforcing effect on the shear modulus after synthesis. The filler effect on swelling and on the associated shear modulus of swollen samples showed a more complicated dependence on structure and surface charge. Finally, it was found that the filler effects were reasonably retained after washing and subsequent drying. The results confirm that MFC holds great potential as a filler material in superabsorbent applications. Furthermore, the results provide some insight on how the structural properties and surface charge of MFC will affect gel properties depending on swelling conditions. This information should be useful in evaluating the use of different types of MFC in future applications.

关键词： SAP MFC Microfibrillated cellulose polyacrylic acid Hydrogels.

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An Odyssey in antiviral drug development—50 years at the Rega Institute:1964–2014

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Acta Pharmaceutica Sinica B 2015年第6期5卷 520-543页

作者： Erik De Clercq Rega Institute for Medical Research

*** it started I entered the Rega Institute for Medical Research in August 1964,as a medical student,to start working under the guidance of *** De Somer,then professor of microbiology at the Leuven School of *** I gra... 详细信息

关键词： Erik De Clercq Antiviral drug Poly(I) poly(C) polyacrylic acid Interferon Reverse transcriptase Suramin Valaciclovir Brivudin Stavudine Tenofovir disoproxil fumarate(TDF) Truvada~ Atripla~ Complera~/Eviplera~ Stribild~ FV-100 Mozobil~ Tenofovir alafenamide(TAF) Holy's legacy Sofosbuvir

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