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New substituted pentazadienes as initiators of free-radical polymerization: synthesis, photochemical properties and perspectives for holographic media 新取代五叠二烯自由基聚合引发剂:合成、光化学性质及全息介质前景
3区 化学 Q2 Chemistry Pub Date : 2023-09-22 DOI: 10.1080/10601325.2023.2257741
Dmitry G. Vyshnevsky, Valeriia N. Ovdenko, Valeriy A. Pavlov, Liudmyla Yu Gryshchuk, Nikolay A. Davidenko, Alexander A. Ishchenko
AbstractThe series of 4,4′-substituted 3-hydroxyethyl-pentaza-1,4-dienes were synthesized in the reaction of aromatic diazonium salts with an ethanol amine. Photolysis of pentaza-1,4-dienes was investigated by means of UV/Vis spectroscopy. Electron donating methyl and methoxy substituents were found to increase photosensitivity whereas electron withdrawing chloro-substituents cause higher photolytic stability. 3-hydroxyethyl-pentaza-1,4-dienes as a radical polymerization initiator has been successfully investigated in 10% methyl methacrylate solution in DMF. Gel permeation chromatography (GPC) and differential scanning calorimetry (DSC) were used for obtained polymers characteristics evaluation. The highest values of PMMA Mn and Đ can be obtained in the case of chloro-substituted derivative. The holograms of a plane wavefront were recorded in media based on obtained PMMA doped by azo-dye by a 532 nm laser in a ∼1-μm-thick sample. The diffraction efficiency values for parallel polarized acting light increased in Cl→Me→OMe series.Keywords: Azo dyesholographydiffraction efficiencyPMMAradical polymerization initiator Disclosure statementThere are no conflicts to declare.
摘要以芳香重氮盐和乙醇胺为原料,合成了4,4′取代的3-羟乙基戊二烯-1,4-二烯。采用紫外/可见光谱法研究了五氮杂-1,4-二烯的光解反应。给予电子的甲基和甲氧基取代基增加了光敏性,而吸电子的氯取代基具有更高的光解稳定性。在10%甲基丙烯酸甲酯溶液中,成功地研究了3-羟乙基-五氮杂-1,4-二烯作为自由基聚合引发剂。采用凝胶渗透色谱法(GPC)和差示扫描量热法(DSC)对所得聚合物的特性进行了评价。在氯取代衍生物的情况下,PMMA Mn和Đ的值最高。用532 nm激光在~ 1 μm厚的样品中记录了以偶氮染料掺杂PMMA为基料的平面波前全息图。平行偏振光的衍射效率值在Cl→Me→OMe串联中增大。关键词:偶氮染料全息衍射效率;自由基聚合引发剂;公开声明;
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引用次数: 0
Use of polyvinyl alcohol-based cationic hydrogels modified with gold nanoparticles as drug and gene delivery systems with enhanced antibacterial properties 用金纳米颗粒修饰的聚乙烯醇基阳离子水凝胶作为增强抗菌性能的药物和基因传递系统
3区 化学 Q2 Chemistry Pub Date : 2023-09-22 DOI: 10.1080/10601325.2023.2258929
İrem Simge Goregen, Ozgur Ozay
AbstractIn this study, PVA/p(HEMA-co-MAPTAC) hydrogels were synthesized by redox polymerization using polyvinyl alcohol (PVA), 2-hydroxyethyl methacrylate (HEMA) and [3-(Methacryloylamino)propyl]trimethylammonium chloride (MAPTAC). In order to increase the antimicrobial activities of synthesized PVA/p(HEMA-co-MAPTAC) hydrogels, they were modified with Au nanoparticles. The swelling behavior of the synthesized hydrogels was investigated. Hydrogels were characterized by various techniques. The drug release studies of PVA/p(HEMA-co-MAPTAC) and PVA/p(HEMA-co-MAPTAC)@Au hydrogels were performed in PBS medium using Ribonucleic acid (RNA) as genetic material and sodium diclofenac (NaDc) as drug. It was determined that PVA/p(HEMA-co-MAPTAC) hydrogel held 91.5 mg/g RNA and 97.48 mg/g NaDc and released 28.32 mg/g RNA and 71.12 mg/g NaDc in PBS medium. Subsequently, PVA/p(HEMA-co-MAPTAC)@Au hydrogel adsorbed 87.46 mg/g RNA and 119.44 mg/g NaDc and released 18.96 mg/g RNA, 104.99 mg/g NaDc drug in PBS medium. Using the data obtained at the end of the release studies, the drug release kinetics of the hydrogels were examined. According to the Korsmeyer Peppas model, RNA release from hydrogels showed Fickian diffusion, while NaDc release showed non-Fickian diffusion behavior. The antibacterial and antifungal activities of the hydrogels were tested using gram-negative bacteria E. coli, gram-positive bacteria B. subtilis and a fungus species C. albicans.Keywords: Hydrogelpolyvinyl alcoholdrug releasegold nanoparticleantibacterial activity AcknowledgmentThis study includes a part of the master thesis of Irem Simge Goregen, and the authors thank Çanakkale Onsekiz Mart University Science and Technology Application and Research Center (COBILTUM) for analyses.Disclosure statementNo potential conflict of interest was reported by the authors.
摘要以聚乙烯醇(PVA)、甲基丙烯酸2-羟乙基(HEMA)和[3-(甲基丙烯胺)丙基]三甲基氯化铵(MAPTAC)为原料,采用氧化还原聚合法制备了PVA/p(HEMA-co-MAPTAC)水凝胶。为了提高合成的PVA/p(HEMA-co-MAPTAC)水凝胶的抗菌活性,对其进行了纳米金修饰。研究了合成的水凝胶的溶胀行为。水凝胶通过各种技术进行表征。以核糖核酸(RNA)为遗传物质,双氯芬酸钠(NaDc)为药物,在PBS培养基中进行PVA/p(HEMA-co-MAPTAC)和PVA/p(HEMA-co-MAPTAC)@Au水凝胶的药物释放研究。测定PVA/p(HEMA-co-MAPTAC)水凝胶在PBS培养基中含有91.5 mg/g RNA和97.48 mg/g NaDc,释放28.32 mg/g RNA和71.12 mg/g NaDc。随后,PVA/p(HEMA-co-MAPTAC)@Au水凝胶吸附87.46 mg/g RNA和119.44 mg/g NaDc,在PBS培养基中释放18.96 mg/g RNA和104.99 mg/g NaDc药物。利用释放研究结束时获得的数据,检查了水凝胶的药物释放动力学。根据Korsmeyer Peppas模型,水凝胶中的RNA释放表现为菲克式扩散,而NaDc释放表现为非菲克式扩散。用革兰氏阴性菌大肠杆菌、革兰氏阳性菌枯草芽孢杆菌和真菌白念珠菌对水凝胶的抗菌和抗真菌活性进行了测试。本研究为Irem Simge Goregen硕士论文的一部分,作者感谢Çanakkale Onsekiz Mart大学科技应用与研究中心(COBILTUM)的分析。披露声明作者未报告潜在的利益冲突。
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引用次数: 0
Development of Jeffamine cross-linked poly(vinyl chloride) films by sequential CuAAC click chemistry and aza-Michael addition 用顺序CuAAC键合化学和aza-Michael加成法制备Jeffamine交联聚氯乙烯薄膜
3区 化学 Q2 Chemistry Pub Date : 2023-09-20 DOI: 10.1080/10601325.2023.2257769
Cagatay Altinkok
AbstractThe objective of this study is to present a promising route to design a series of new poly(vinyl chloride) (PVC) films cross-linked with polyetheramine (PEA), namely jeffamine, by combining copper (I)-catalyzed azide-alkyne cycloaddition “click” reaction (CuAAC) and aza-Michael addition (PVC-Jeffs). In the first step, the clickable azido‐functional PVC is prepared easily by displacement reaction between chlorine groups and sodium azide (PVC-N3) and then reacted with propargyl acrylate by CuAAC (PVC-acr). The second step is aza-Michael addition of PVC-acr and Jeffamine to achieve the desired PVC-Jeffs. Transparent and uniform films are prepared by casting from dichloromethane solvent. The effect of loading ratio by weight (PVC/Jeffamine (w/w) = 9:1; 8:2 and 7:3) on the thermal properties of final PVC-Jeffs is systematically explored. The chemical structure of PVC-Jeffs and their intermediates is characterized by Fourier transform infrared (FT-IR) and proton nuclear magnetic resonance (1H-NMR) spectroscopies, whereas thermal characteristics of the samples are investigated by thermogravimetric (TGA) and differential scanning calorimetry (DSC) analyses. The higher Jeffamine loaded PVC-Jeff exhibit enhanced thermostability and glass transition temperature with the Tg of 69.9 °C. Hence, this kind of strategy to achieve the PVC based films with good characteristics is expected to be applied in the preparation of biomedical materials.Keywords: aza-Michael additioncopper-catalyzed azide-alkyne cycloadditioncross-linked filmsJeffaminepoly(vinyl chloride) AcknowledgmentThe authors thank Denge Kimya for supplying the Jeffamine® ED-600.Disclosure statementNo potential conflict of interest was reported by the author(s).
摘要本研究的目的是通过铜(I)催化叠氮-炔环加成反应(CuAAC)和aza-Michael加成反应(PVC- jeffs),设计一系列新型聚乙胺(PEA)交联聚氯乙烯(PVC)膜。首先,通过氯基与叠氮化钠(PVC- n3)的置换反应制备了可点击的叠氮化功能PVC,然后用CuAAC (PVC-acr)与丙烯酸丙酯反应。第二步是将PVC-acr和杰弗明加在一起,得到所需的PVC-Jeffs。以二氯甲烷为溶剂,采用浇铸法制备透明均匀的薄膜。重量负载比(PVC/Jeffamine (w/w) = 9:1;8:2和7:3)对最终聚氯乙烯-杰夫斯的热性能进行了系统的探讨。利用傅里叶红外(FT-IR)和质子核磁共振(1H-NMR)对pvc -杰夫斯及其中间体的化学结构进行了表征,并用热重(TGA)和差示扫描量热(DSC)分析了样品的热特性。高负载的Jeffamine PVC-Jeff表现出更高的热稳定性和玻璃化转变温度,Tg为69.9℃。因此,这种策略可以使PVC基薄膜具有良好的性能,有望应用于生物医用材料的制备。关键词:aza-Michael加成铜催化叠氮-炔环加成交联膜jeffaminepoly(氯乙烯)感谢Denge Kimya提供的Jeffamine®ED-600。披露声明作者未报告潜在的利益冲突。
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引用次数: 0
High stretching tuned GO decorated non-shrinkable polyacrylic acid-based composite fiber and its excellent performance as a Fenton catalyst 高拉伸调谐氧化石墨烯装饰不收缩聚丙烯酸基复合纤维及其作为芬顿催化剂的优异性能
3区 化学 Q2 Chemistry Pub Date : 2023-09-15 DOI: 10.1080/10601325.2023.2257738
Jinghong Wang, Jiayi Liu, Zeyan Wang, Nana Huang, Jiao Han, Naiku Xu, Jiahan Zhang, Xiangyuan Yan, Yaqi Li
AbstractMixed valent iron ions were used to create a flexible ionic crosslinking network through coordination, making PAA fiber highly stretchable, and the fiber was highly stretched to tear graphene oxide (GO) sheets into discontinuously-dispersed monolayer sheets. The monolayer sheets could construct many hydrogen bonds with PAA chains to serve as knots to hinder chain movement, controlling the shrinkage of stretched fiber. Co-solvent formamide could improve the heat resistance of PAA fiber through special calorific effect; thus the highly-stretched fiber could tolerate high temperature heat setting. Due to the advanced structure induced by stretching, internal force relaxation caused by heat setting, and the existence of knots, the resulting fiber possessed the features of high strength and no shrinkage. High strength made the fiber mechanically applicable, and the unshrinkability could help it to maintain large specific surface area and strong iron ions-immobilizing capability. As a result, the catalytic activity of non-shrinkable fiber was increased by 25% compared with that of shrinkable fiber for methylene blue (MB) decolorization, and iron ion loading ratio was increased by 174.5%; however, iron ion leaching ratio was decreased by 76.5%, which was conducive to reusability improvement. Thereby, the resulting fiber could be repeatedly used to decolorize MB.Keywords: Dye wastewater treatmentfenton catalytic composite fibermulticomponent assistancepolyacrylic acidwet spinning AcknowledgmentsWe would like to thank the Analytical & Testing Center of Tiangong University for measurement work.Author contributionsJinghong Wang: Writing-original draft, Validation, Investigation, Data curation, Resources. Jiayi Liu: Investigation, Data curation. Zeyan Wang: Investigation, Data curation. Nana Huang: Investigation, Data curation. Jiao Han: Investigation, Data curation. Naiku Xu: Conceptualization, Methodology, Formal analysis, Writing-original draft, Project administration, Funding acquisition. Jiahan Zhang: Investigation, Data curation. Xiangyuan Yan: Investigation, Data curation. Yaqi Li: Investigation, Data curation.Disclosure statementNo potential conflict of interest was reported by the author(s).Data availability statementThe authors confirm that the data supporting the findings of this study are available within the article and its supplementary materials.Additional informationFundingThis work was support by the National Nature Science Foundation of China [grant number 51103099], the Tianjin Municipal Natural Science Foundation [grant number 12JCQNJC01600], the Research Fund for the Doctoral Program of Higher Education of China [grant number 20111201120002], and the China Postdoctoral Science Foundation [grant numbers 2014M550143, 2015T80221].
摘要利用混合价铁离子通过配位形成柔性离子交联网络,使PAA纤维具有高拉伸性,并将氧化石墨烯(GO)片拉伸成不连续分散的单层片。单层膜可以与PAA链形成许多氢键作为结,阻碍链的运动,控制拉伸纤维的收缩。助溶剂甲酰胺通过特殊的热效应提高PAA纤维的耐热性;因此,高拉伸纤维可以承受高温热固化。由于拉伸引起的先进结构,热定型引起的内力松弛,以及结的存在,使纤维具有高强度和不收缩的特点。高强度使纤维具有机械适用性,不收缩性使其保持较大的比表面积和较强的铁离子固定化能力。结果表明,与收缩纤维相比,非收缩纤维对亚甲基蓝(MB)脱色的催化活性提高了25%,铁离子负载比提高了174.5%;铁离子浸出率降低了76.5%,有利于提高可重复利用性。关键词:染料废水处理;fenton催化复合纤维;多组分助剂;聚丙烯酸;湿法纺丝感谢天工大学分析测试中心所做的测量工作。王景红:写作—原稿、验证、调研、数据整理、资源。刘佳怡:调查,数据管理。王泽燕:调查,数据管理。黄娜娜:调查,数据管理。焦晗:调查,数据管理。许乃库:概念、方法论、形式分析、写作原稿、项目管理、资金获取。张嘉涵:调查,数据管理。闫祥源:调查,数据管理。李雅琪:调查,数据管理。披露声明作者未报告潜在的利益冲突。数据可用性声明作者确认,支持本研究结果的数据可在文章及其补充材料中获得。基金资助:国家自然科学基金项目[批准号:51103099]、天津市自然科学基金项目[批准号:12JCQNJC01600]、高等学校博士点科研专项基金项目[批准号:20111201120002]、中国博士后科学基金项目[批准号:2014M550143, 2015T80221]。
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引用次数: 0
Preparation and properties of flame-retardant epoxy prepreg yarn for dry winding 干式卷绕用阻燃环氧预浸纱的制备及性能研究
3区 化学 Q2 Chemistry Pub Date : 2023-09-12 DOI: 10.1080/10601325.2023.2253838
Ming Li, Zhiwen Li, Jingzhu Han, Yi Wei, Wei Min, Ruize Gao, Zeyu Sun
AbstractThe winding tension of the dry-wound forming process is uniform, the process is easy to control and the structure and performance of the prepared vehicle-mounted hydrogen composite pressure vessels are stable. Since the vehicle-mounted hydrogen pressure vessels must be subjected to rigorous fire experiments, the flame-retardant epoxy prepreg yarn technology is currently monopolized by foreign countries. The development of flame-retardant prepreg yarn with good processing properties is of great significance to the promotion and application of hydrogen pressure vessels. Here, a flame-retardant additive hexaphenoxy cyclotriphosphazene (HPCTP) was synthesized and dissolved in epoxy resin of prepreg yarn named P/N-EP. Then, the flame-retardant prepreg yarn was made by the solution impregnation method. Curing behavior, thermal analysis combustion behavior and mechanical properties of P/N-EP and tensile properties of flame-retardant prepreg yarn were investigated. Experimental results showed that the LOI value reached 36.4% at 10 phr and reached the V-0 level of the UL-94 test. The results about thermal stability of the P-N/EP resin system showed that with the increase of P-N content, T5% (temperature at 5% weight loss) and CY600 (carbon residue rate) both increased. The microstructure of carbon residue after UL-94 test was studied by electron microscope and laser Raman spectrometer. The results showed that with the increase of P-N content, the carbon layer structure became denser and the ID/IG decreased significantly, to achieve the flame-retardant effect by the condensed phase mechanism.Keywords: Flame-retardantepoxy prepreg yarndry windingmechanical properties Disclosure statementNo potential conflict of interest was reported by the authors.Additional informationFundingThis work was supported by Jilin Province intelligent manufacturing major science and technology project (20210301004GX).
摘要干绕成形过程中缠绕张力均匀,工艺易于控制,制备的车载氢复合材料压力容器结构性能稳定。由于车载氢气压力容器必须经过严格的防火试验,目前阻燃环氧预浸纱技术被国外所垄断。开发加工性能良好的阻燃预浸纱对氢压力容器的推广应用具有重要意义。合成了一种阻燃添加剂六苯基环三磷腈(HPCTP),并将其溶解在P/N-EP预浸纱的环氧树脂中。然后,采用溶液浸渍法制备阻燃预浸纱。研究了P/N-EP阻燃预浸纱的固化性能、热分析、燃烧性能、力学性能和拉伸性能。实验结果表明,在10 phr时LOI值达到36.4%,达到UL-94测试的V-0水平。P-N/EP树脂体系的热稳定性结果表明,随着P-N含量的增加,T5%(失重5%温度)和CY600(残炭率)均增加。采用电子显微镜和激光拉曼光谱仪对UL-94试验后的残炭微观结构进行了研究。结果表明:随着P-N含量的增加,碳层结构变得更加致密,ID/IG显著降低,通过凝聚相机制达到阻燃效果;关键词:阻燃环氧预浸料纱线缠绕机械性能披露声明作者未报告潜在利益冲突。本研究由吉林省智能制造重大科技专项(20210301004GX)资助。
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Journal of Macromolecular Science Part A-Pure and Applied Chemistry
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