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Cyclic voltammetric study of redox-active surfactant by hydrogel-modified electrode 水凝胶修饰电极对氧化还原活性表面活性剂的循环伏安研究
Polymer Gels and Networks Pub Date : 1997-01-01 Epub Date: 1999-07-07 DOI: 10.1016/S0966-7822(97)00007-5
Yukikazu Takeoka , Takashi Aoki , Kohei Sanui , Naoya Ogata , Masayoshi Watanabe
{"title":"Cyclic voltammetric study of redox-active surfactant by hydrogel-modified electrode","authors":"Yukikazu Takeoka ,&nbsp;Takashi Aoki ,&nbsp;Kohei Sanui ,&nbsp;Naoya Ogata ,&nbsp;Masayoshi Watanabe","doi":"10.1016/S0966-7822(97)00007-5","DOIUrl":"10.1016/S0966-7822(97)00007-5","url":null,"abstract":"<div><p>The dissolved states of redox-active non-ionic surfactant (FPEG) in the swollen state of N-isopropyl acrylamide (NIPA) hydrogel have been studied by using a gel-modified electrode. The pronounced decrease in the peak current and the negative shift in the formal potential of CV at the gel-modified electrode, as compared with the normal GC electrode, was observed in the micelle-solution; this indicates that the diffusive FPEG molecules which form the micelle hardly penetrate into the NIPA gel. This result suggests that there exists an interaction between FPEG molecules and the NIPA gel in the vicinity of the surface of the NIPA gel in the micelle-solution. However, this also indicates that a small amount of FPEG molecules which can form micelles exist in the NIPA gel.</p></div>","PeriodicalId":20331,"journal":{"name":"Polymer Gels and Networks","volume":"5 4","pages":"Pages 369-383"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0966-7822(97)00007-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77233534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
States of water in poly(vinyl alcohol) hydrogels 聚乙烯醇水凝胶中水的状态
Polymer Gels and Networks Pub Date : 1997-01-01 Epub Date: 1999-07-07 DOI: 10.1016/S0966-7822(97)00016-6
Masanobu Nagura , Naoya Takagi , Hiroshi Katakami , Yasuo Gotoh , Yutaka Ohkoshi , Tomoe Koyano , Norihiko Minoura
{"title":"States of water in poly(vinyl alcohol) hydrogels","authors":"Masanobu Nagura ,&nbsp;Naoya Takagi ,&nbsp;Hiroshi Katakami ,&nbsp;Yasuo Gotoh ,&nbsp;Yutaka Ohkoshi ,&nbsp;Tomoe Koyano ,&nbsp;Norihiko Minoura","doi":"10.1016/S0966-7822(97)00016-6","DOIUrl":"10.1016/S0966-7822(97)00016-6","url":null,"abstract":"<div><p>Poly(vinyl alcohol) (PVA) hydrogels with various water contents were prepared from 10 wt% aqueous solutions of mixtures of PVA and anionic poly(styrene sulfonic acid) sodium salt (NaPSS) by casting, dehydrating, and then extracting NaPSS. The existence of three types of ice were suggested by differential scanning calorimetry (DSC) measurements for every frozen hydrogel. In the frozen hydrogels the states of water, except unfrozen water, were ice of free water and disordered ice crystals. The mobility and activation energy for motion of water molecules in unfrozen hydrogels were investigated by using pulsed nuclear magnetic resonance (PNMR) measurements. It was concluded that there are two states of water in the unfrozen hydrogel, i.e. unfrozen water and disordered water which is mainly formed in narrow apertures in the hydrogel. The discrepancy between the DSC and PNMR measurements was explained by a structural transformation during cooling.</p></div>","PeriodicalId":20331,"journal":{"name":"Polymer Gels and Networks","volume":"5 5","pages":"Pages 455-468"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0966-7822(97)00016-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81075199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
Anisotropic swelling behavior of copolymeric gel film with crystalline oriented side chains 具有结晶取向侧链的共聚物凝胶膜的各向异性膨胀行为
Polymer Gels and Networks Pub Date : 1997-01-01 Epub Date: 1999-07-07 DOI: 10.1016/S0966-7822(97)00013-0
Xiaowei He, Atsushi Takahara, Tisato Kajiyama
{"title":"Anisotropic swelling behavior of copolymeric gel film with crystalline oriented side chains","authors":"Xiaowei He,&nbsp;Atsushi Takahara,&nbsp;Tisato Kajiyama","doi":"10.1016/S0966-7822(97)00013-0","DOIUrl":"10.1016/S0966-7822(97)00013-0","url":null,"abstract":"<div><p>A copolymeric gel film with swelling anisotropy was prepared on a flat Petri dish by free-radical copolymerization of stearyl acrylate (SA) and acrylic acid (AA) with N,N′-methylenebisacrylamide (MBAA) as the crosslinking agent. An X-ray diffraction study of the gel film revealed that the SA side chains in the gel film SA/AA/MBAA:24.7/74.3/1.0 (in mol) were spontaneously oriented perpendicular to the film surface in order to minimize the interfacial free energy between the gel film surface and air. The one-dimensional swelling ratio perpendicular to the gel film surface in an ethanol/water mixture was greater than that in the direction parallel to the film surface. This swelling anisotropy can be explained on the basis of changes in the state of anisotropic aggregation.</p></div>","PeriodicalId":20331,"journal":{"name":"Polymer Gels and Networks","volume":"5 5","pages":"Pages 429-438"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0966-7822(97)00013-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88295170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
A proton NMR investigation of crosslinks and entanglements in polyethylene networks and star polymers 聚乙烯网络和星形聚合物中交联和缠结的质子核磁共振研究
Polymer Gels and Networks Pub Date : 1997-01-01 Epub Date: 1998-05-19 DOI: 10.1016/S0966-7822(97)00004-X
M.E. Ries , M.G. Brereton , P.G. Klein , P. Dounis
{"title":"A proton NMR investigation of crosslinks and entanglements in polyethylene networks and star polymers","authors":"M.E. Ries ,&nbsp;M.G. Brereton ,&nbsp;P.G. Klein ,&nbsp;P. Dounis","doi":"10.1016/S0966-7822(97)00004-X","DOIUrl":"10.1016/S0966-7822(97)00004-X","url":null,"abstract":"<div><p>This paper investigates the ability of proton transverse NMR relaxation to study the structure and dynamics of polyethylene melts. Commercial linear samples of similar M<sub>n</sub> and various M<sub>w</sub> have been examined, together with samples crosslinked by electron beam irradiation. Apart from the linear sample of lowest M<sub>w</sub>, all the free induction decays (FIDs) are very similar and this is attributed to the presence of free chain ends. The magnitude of this problem is illustrated by generating theoretical FIDs from networks of different crosslink density and reptating linear chains of different entanglement spacings, with and without free chain ends. A new result for the FID using the reptation spectrum is presented and used to fit data from the linear polyethylenes. This yields an “NMR average” molar mass, similar to the accepted value and provides information on a sample's polydispersity. Three-arm polyethylene star polymers, of low polydispersity and various arm lengths, have also been studied. The large variation in the chain dynamics from the core to the free end of the star arm is not reflected in the FIDs, which can all be well-fitted by double exponentials. This highlights the importance of specific isotopic labelling in studying such systems.</p></div>","PeriodicalId":20331,"journal":{"name":"Polymer Gels and Networks","volume":"5 3","pages":"Pages 285-305"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0966-7822(97)00004-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78855852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Preparation of Bi-based superconducting fiber by metal biosorption of Na-alginate 金属生物吸附海藻酸钠制备铋基超导纤维
Polymer Gels and Networks Pub Date : 1997-01-01 Epub Date: 1998-05-19 DOI: 10.1016/S0966-7822(96)00048-2
Takashi Shimizu , Akio Takada
{"title":"Preparation of Bi-based superconducting fiber by metal biosorption of Na-alginate","authors":"Takashi Shimizu ,&nbsp;Akio Takada","doi":"10.1016/S0966-7822(96)00048-2","DOIUrl":"10.1016/S0966-7822(96)00048-2","url":null,"abstract":"<div><p>The excellent gelation and metal biosorption properties of Na-alginate in acidic metal ion solution were advantageous for the preparation of the Bi-based superconducting fibers. 0.67 <em>mol</em>/<em>l</em> nitric acid solution and acidic mixed metal nitrates solution of Bi, Pb, Sr, Ca and Cu were used for the gelation and the biosorption, respectively. A stretched and dried gel having uniform diameter and unlimited length was obtained as the precursor. The superconducting fiber, which was principally constructed of the mixture of 2212 and 2223 phase, was prepared by sintering the precursor in an air atmosphere at a temperature of 1104 K for about 40 h. The optimum ratio of metal ions in the solution was determined on the basis of the analysis of the metal components of the precursor or fiber using an atomic absorbence spectrometer and X-ray fluorescence spectrometer. The effect of HNO<sub>3</sub> on the biosorption of five kinds of metal was discussed and the conclusion of sintering process and the inspection of superconducting phase were performed by DSC., TG, IR and XRD experiments.</p></div>","PeriodicalId":20331,"journal":{"name":"Polymer Gels and Networks","volume":"5 3","pages":"Pages 267-283"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0966-7822(96)00048-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91121216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 16
Papers published in volume 4 论文发表于第4卷
Polymer Gels and Networks Pub Date : 1997-01-01 Epub Date: 2004-07-02 DOI: 10.1016/S0966-7822(97)90005-8
{"title":"Papers published in volume 4","authors":"","doi":"10.1016/S0966-7822(97)90005-8","DOIUrl":"https://doi.org/10.1016/S0966-7822(97)90005-8","url":null,"abstract":"","PeriodicalId":20331,"journal":{"name":"Polymer Gels and Networks","volume":"5 1","pages":"Pages I-III"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0966-7822(97)90005-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137211358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Relative humidity and temperature effects on mechanical and water vapor barrier properties of myofibrillar protein-based films 相对湿度和温度对肌原纤维蛋白基薄膜力学和水汽阻隔性能的影响
Polymer Gels and Networks Pub Date : 1997-01-01 Epub Date: 1998-05-19 DOI: 10.1016/S0966-7822(96)00026-3
Bernard Cuq , Nathalie Gontard , Christian Aymard , Stéphane Guilbert
{"title":"Relative humidity and temperature effects on mechanical and water vapor barrier properties of myofibrillar protein-based films","authors":"Bernard Cuq ,&nbsp;Nathalie Gontard ,&nbsp;Christian Aymard ,&nbsp;Stéphane Guilbert","doi":"10.1016/S0966-7822(96)00026-3","DOIUrl":"10.1016/S0966-7822(96)00026-3","url":null,"abstract":"<div><p>Fish mince-based films were studied as a function of equilibrium relative humidity and temperature conditions. The sigmoid-shape adsorption isotherm curves were typical of high protein content material and were adequately described, irrespective of temperature, by the Guggenheim-Anderson-de Boer equation. A plasticizing effect of water related to rapid changes in the functional properties was mainly noted at the highest <em>a</em><sub><em>w</em></sub> and explained by the disruptive water-polymer hydrogen bonding theory. Relatively sharp decreases in force at break, elastic modulus and water vapor barrier properties, and increases in deformation at break were observed at temperature-dependent relative humidities; this relative humidity was reduced by increasing the temperature. The temperature dependence of the hydration effect on functional properties could be explained by the glass transition theory.</p></div>","PeriodicalId":20331,"journal":{"name":"Polymer Gels and Networks","volume":"5 1","pages":"Pages 1-15"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0966-7822(96)00026-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72948351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 80
Ferrogel: a new magneto-controlled elastic medium 铁凝胶:一种新型磁控弹性介质
Polymer Gels and Networks Pub Date : 1997-01-01 Epub Date: 1999-07-07 DOI: 10.1016/S0966-7822(97)00010-5
M. Zrínyi, L. Barsi, A. Büki
{"title":"Ferrogel: a new magneto-controlled elastic medium","authors":"M. Zrínyi,&nbsp;L. Barsi,&nbsp;A. Büki","doi":"10.1016/S0966-7822(97)00010-5","DOIUrl":"10.1016/S0966-7822(97)00010-5","url":null,"abstract":"<div><p>Magnetic-field-sensitive gels, called ferrogels, have been prepared by introducing monodomain, magnetite particles of colloidal size into chemically crosslinked poly(vinyl alcohol) hydrogels. The influence of a non-uniform external magnetic field on the shape of gel tubes and the possibility to induce elongation and contraction by means of a magnetic field gradient produced by an electromagnet have been demonstrated. It was shown that both the concentration of magnetite particles and the crosslinking density of the ferrogels play an essential role in the magneto-elastic behaviour.</p></div>","PeriodicalId":20331,"journal":{"name":"Polymer Gels and Networks","volume":"5 5","pages":"Pages 415-427"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0966-7822(97)00010-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72943666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 183
Responsive conducting polymer-hydrogel composites 响应性导电聚合物-水凝胶复合材料
Polymer Gels and Networks Pub Date : 1997-01-01 Epub Date: 1998-05-19 DOI: 10.1016/S0966-7822(96)00044-5
C.J. Small, C.O. Too, G.G. Wallace
{"title":"Responsive conducting polymer-hydrogel composites","authors":"C.J. Small,&nbsp;C.O. Too,&nbsp;G.G. Wallace","doi":"10.1016/S0966-7822(96)00044-5","DOIUrl":"10.1016/S0966-7822(96)00044-5","url":null,"abstract":"<div><p>A range of conducting polymer-hydrogel composites have been prepared and characterised. These composites are electroactive and have high rehydration levels (80–95%). The high water content and the ability to induce efficient electrochemical release, even of larger molecules, suggest that the resultant materials have a novel, open porous structure.</p></div>","PeriodicalId":20331,"journal":{"name":"Polymer Gels and Networks","volume":"5 3","pages":"Pages 251-265"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0966-7822(96)00044-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83092350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 69
New hydrogels based on carbohydrate and on carbohydrate-synthetic polymer networks 基于碳水化合物和碳水化合物合成聚合物网络的新型水凝胶
Polymer Gels and Networks Pub Date : 1997-01-01 Epub Date: 1998-05-19 DOI: 10.1016/S0966-7822(96)00051-2
V. Crescenzi , G. Paradossi , P. Desideri , M. Dentini , F. Cavalieri , E. Amici , R. Lisi
{"title":"New hydrogels based on carbohydrate and on carbohydrate-synthetic polymer networks","authors":"V. Crescenzi ,&nbsp;G. Paradossi ,&nbsp;P. Desideri ,&nbsp;M. Dentini ,&nbsp;F. Cavalieri ,&nbsp;E. Amici ,&nbsp;R. Lisi","doi":"10.1016/S0966-7822(96)00051-2","DOIUrl":"10.1016/S0966-7822(96)00051-2","url":null,"abstract":"<div><p>Novel synthetic routes recently explored in our laboratories in order to obtain crosslinked polymeric samples, comprising either chitosan or gellan as polysaccharidic components, are outlined. The former networks, in which different crosslinking partners have been used (i.e. oxidized cyclodextrin and telechelic poly(vinylalcohol)), can bear fixed positive charges while the latter are anionic. Zwitterionic networks formed by the template polymerization of acrylic acid onto chitosan with concomitant crosslinking (bisacrylamide) have also been prepared. Procedures adopted are simple and, once optimized, may lead to biocompatible hydrogels, with easily tunable physical properties, of potential interest in the biomedical area.</p></div>","PeriodicalId":20331,"journal":{"name":"Polymer Gels and Networks","volume":"5 3","pages":"Pages 225-239"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0966-7822(96)00051-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86567154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 45
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