Angewandte Makromolekulare Chemie最新文献

{"title":"Preparation and characterization of spinning dopes for dry spinning of continuous alumina green fibers","authors":"B. Clauss","doi":"10.1002/APMC.1994.052170114","DOIUrl":"https://doi.org/10.1002/APMC.1994.052170114","url":null,"abstract":"Aqueous spinning dopes for dry spinning of alumina green fibers were prepared by using basic aluminium chloride Al2(OH)5Cl · 2.5 H2O and SiO2 sol as inorganic components and poly(vinyl alcohol) (PVA) as polymeric organic component. \u0000 \u0000 \u0000 \u0000Certain rheological properties of the mixtures are essential to achieve good spinnability at high spinning speeds. The rheology of the dope is influenced by the molecular weight and the degree of hydrolysis of the PVA, as well as by the composition and the concentration of the mixture. For mixtures without SiO2 best results were obtained at a PVA: Al2O3 mass ratio of 18:82 and an Oxide content of about 27 wt.-%. The PVA used has an average molecular weight of 70000 and a degree of hydrolysis of 89%. \u0000 \u0000 \u0000 \u0000The dopes were spun to continuous green fibers at speeds up to 500 m/min. The structure and the ageing behaviour of concentrated solutions of basic aluminium chloride has been intensively studied. \u0000 \u0000 \u0000 \u0000Wasrige Spinnmassen fur das Trockenspinnen von Aluminiumoxid-Grunfasern wurden hergestellt. Dabei wurden basisches Aluminiumchlorid Al2(OH)5Cl · 2,5 H2O und SiO2-Sol als anorganische Komponenten und Polyvinylalkohol (PVA) als polymere organische Komponente eingesetzt. \u0000 \u0000 \u0000 \u0000Bestimmte rheologische Eigenschaften der Mischungen sind essentiell, um eine gute Spinnbarkeit bei hohen Spinngeschwindigkeiten zu erhalten. Die Rheologie der Spinnmassen wird zum einen vom Molekulargewicht und dem Verseifungsgrad des PVA beeinflust und zum anderen von der Zusammensetzung und der Konzentration der Mischung. Fur Mischungen ohne SiO2 wurden die besten Ergebnisse bei einem PVA:Al2O3, Massenverhaltnis von 18:82 und einem Oxidgehalt von ungefahr 27 Gew.-% erzielt. Der verwendete PVA hat ein mittleres Molekulargewicht von 70000 und einen Verseifungsgrad von 89%. \u0000 \u0000 \u0000 \u0000Die Spinnmassen wurden mit Spinngeschwindigkeiten von bis zu 500 m/min zu kontinuierlichen Grunfasern versponnen. Die Struktur und das Alterungsverhalten von konzentrierten Losungen von basischem Aluminiumchlorid wurden ausfuhrlich untersucht.","PeriodicalId":7808,"journal":{"name":"Angewandte Makromolekulare Chemie","volume":"2 1","pages":"139-158"},"PeriodicalIF":0.0,"publicationDate":"1994-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80334920","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}

{"title":"Viscous and elastic behaviour of SEBS triblock copolymer","authors":"I. Mathew, K. E. George, D. Francis","doi":"10.1002/APMC.1994.052170106","DOIUrl":"https://doi.org/10.1002/APMC.1994.052170106","url":null,"abstract":"The viscous and elastic behaviour of the saturated triblock copolymer polystyrene-block-poly(ethylene-co-butylene)-polystyrene (SEBS) was investigated using a capillary viscometer. The viscous behaviour was evaluated from the variation of viscosity with shear and temperature, and the elastic behaviour from the capillary entrance pressure loss, die swell ratio and surface roughness. The melt behaviour was found to result from the two-phase structure which existed up to a particular shear and/or temperature and thereafter from the single-phase structure. \u0000 \u0000 \u0000 \u0000Das viskose und das elastische Verhalten von gesattigtem Triblock-Copolymeren Polystyrol-block-poly(ethylen-co-butylen)-block-polystyrol (SEBS) wurde mittels Kapillarviskosimetrie untersucht. Das Viskositatsverhalten wurde aus der Abhangigkeit der Viskositat von Scherung und Temperatur, das elastische Verhalten aus dem Kapillareingangsdruckverlust, der Strangaufweitung und der Oberflachenrauheit ermittelt. Das Schmelzeverhalten resultiert aus der zweiphasigen Struktur, die unterhalb einer definierten Scherung und/oder Temperatur existiert, und aus der einphasigen Struktur oberhalb dieser Werte.","PeriodicalId":7808,"journal":{"name":"Angewandte Makromolekulare Chemie","volume":"92 1","pages":"51-59"},"PeriodicalIF":0.0,"publicationDate":"1994-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74543760","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}

{"title":"Study of the mechanism of the antioxidant action of ethoxyquin","authors":"L. Taimr","doi":"10.1002/APMC.1994.052170112","DOIUrl":"https://doi.org/10.1002/APMC.1994.052170112","url":null,"abstract":"A study has been carried out of the reaction of 6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline (ethoxyquin, I) with alkylperoxyls. In the presence of a relatively low concentration of 1-cyano-1-methylethylperoxyl, I reacts to form dimer IV (8-(6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinolin-1-yl)-6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline) as the main product and quinoline derivative III (2,4-dimethyl-6-ethoxyquinoline), as a side product, i.e., substances formed by the conversion of the aminyl II (6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinolin-1-yl) alone. Smaller amounts of p-quinoneimine VI and o-quinoneimine VIII (2,2,4-trimethyl-2,6-dihydro-6-quinolone and 6-ethoxy-2,2,4-trimethyl-2,8-dihydro-8-quinolone) have been found; these substances are formed by further oxidation of II. In the presence of relatively high concentrations of tert-butylperoxyls, peroxide IX (6-tert-butylperoxy-6-ethoxy-2,2,4-trimethyl-2,6-dihydroquinoline) is formed as the main product. Substance IX thermally decomposes to form VIII, while in the presence of weak acids IX is converted into VI as the main product. \u0000 \u0000Dimer IV is a medium-strength antioxidant which is gradually converted into 8-(6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinolin-1-yl)-2,2,4-trimethyl-6-quinolone (XI) and 8-(6-ethoxy-3-hydroxy-2,2-dimethyl-4-methylene-1,2,3,4-tetrahydroquinolin-1-yl-)-2,2,4-trimethyl-2,6-dihydro-6-quinolone) (XII). The methyl group in XI actively participates in the antioxidation process. \u0000 \u0000When formed, nitroxide V (6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinolin-N-oxyl) acts as an efficient antioxidant which, however, does not participate in the cyclic mechanism that is employed to explain the action of antioxidants of the HALS type. \u0000 \u0000The antioxidant properties were evaluated on the basis of their effect on the course of the autoxidation of squalene.","PeriodicalId":7808,"journal":{"name":"Angewandte Makromolekulare Chemie","volume":"402 ","pages":"119-128"},"PeriodicalIF":0.0,"publicationDate":"1994-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91445713","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}

{"title":"Reactive blending of thermosets: Molecular, morphological and mechanical analysis","authors":"E. Martuscelli, P. Musto, G. Ragosta, G. Scarinzi","doi":"10.1002/APMC.1994.052170115","DOIUrl":"https://doi.org/10.1002/APMC.1994.052170115","url":null,"abstract":"A number of different approaches were used to enhance the toughness of tri- and tetrafunctional epoxies and of unsaturated polyester resins. In the case of epoxies, tough, thermally stable, engineering thermoplastics, namely a bisphenol-A polycarbonate and a thermoplastic poly(ether imide) (Ultem 1000) were employed as modifiers. For unsaturated polyesters a different approach was adopted: two commercial liquid rubbers were chemically modified to enhance their reactivity towards the matrix functionalities. In particular, a hydroxy-terminated polybutadiene and an aminoterminated butadiene-acrylonitrile copolymer were transformed into isocyanate-terminated and maleimide-terminated rubbers, respectively. A further system which is described in the present contribution is aimed at mitigating another deficiency of the polyester matrix, namely its rapidly decreasing rigidity at temperatures above room temperature. In this case, a thermosetting bismaleimide was incorporated into the resin as a co-reactive second component.","PeriodicalId":7808,"journal":{"name":"Angewandte Makromolekulare Chemie","volume":"106 1","pages":"159-190"},"PeriodicalIF":0.0,"publicationDate":"1994-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79337072","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}

{"title":"Structure and some properties of methacrylonitrile/divinylbenzene macroporous copolymers","authors":"B. Kolarz, A. Trochimczuk, M. Wojaczyǹska, M. Drewniak","doi":"10.1002/APMC.1994.052170103","DOIUrl":"https://doi.org/10.1002/APMC.1994.052170103","url":null,"abstract":"Copolymers of methacrylonitrile (MAN) and divinylbenzene (DVB) of different crosslinking degree between 6–50 wt.-% DVB were obtained by suspension polymerization of monomers in the presence of a diluent (1 : 1, v/v), i.e. a mixture of toluene with tetradecane (9 : 1, v/v). Porosity of the copolymers (MAN/DVB) has been found to fall in the range 48–57.3%. Specific surface area of the copolymers increased in the range of mesopores with the increasing crosslinking degree. Sorption properties of the copolymers towards aqueous phenol solution are similar to those of acrylonitrile-DVB copolymers. MAN/DVB copolymers display rather poor thermal stability (low residue) what indicates that thermally initiated cyclization of nitrile groups can not take place and the influence of depolymerization may be significant. \u0000 \u0000 \u0000 \u0000Copolymere aus Methacrylnitril (MAN) und Divinylbenzol (DVB) mit unterschiedlichen Vernetzergehalten zwischen 6 und 50 Gew.-% DVB wurden durch Suspensions-polymerisation in Gegenwart eines Losungsmittelgemisches (1 : 1, v/v) aus Toluol und Tetradecan (9 : 1, v/v) hergestellt. Die Porositat der Copolymeren (MAN/DVB) lag zwischen 48 und 57,3%. Die spezifische Oberflache der Copolymeren nahm mit steigendem Vernetzungsgrad zu. Die Sorptionseigenschaften fur eine wasserige Phenollosung ahneln denen von Acrylnitril/DVB-Copolymeren. Die thermische Stabilitat der MAN/DVB-Copolymeren ist vergleichsweise schlecht (geringer Ruckstand), wahrscheinlich dadurch bedingt, das die Nitrilgruppen nicht thermisch cyclisiert werden konnen und die Depolymerisation einen merklichen Einflus hat.","PeriodicalId":7808,"journal":{"name":"Angewandte Makromolekulare Chemie","volume":"81 1","pages":"19-29"},"PeriodicalIF":0.0,"publicationDate":"1994-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76847094","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}

{"title":"Modified styrene‐isoprene‐styrene block copolymer membranes complexed with cobalt‐containing schiff's bases for oxygen permeation","authors":"G. Hsiue, Wey‐Leun Hsu, Jen-Ming Yang","doi":"10.1002/APMC.1994.052170104","DOIUrl":"https://doi.org/10.1002/APMC.1994.052170104","url":null,"abstract":"The grafting of 4-vinylpyridine (VP) and 1-vinylimidazole (VIm) onto styrene-isoprene-styrene (SIS) triblock copolymer by radiation-induced graft copolymerization was studied. The effect of grafting degree on gas permeability of membranes made of grafted copolymers was investigated. The complex formation of the modified SIS (SIS-g-VP or SIS-g-VIm) with cobalt-containing Schiff's bases (CoS) in chloroform solution was studied. Facilitated transport of molecular oxygen in modified SIS membranes containing CoS as fixed carrier of oxygen, and oxygen permeability in modified SIS membranes due to the oxygen binding ability to CoS was observed. Mechanism of oxygen transport across the SIS-g-VP-CoS and SIS-g-VIm-CoS membrane is discussed. \u0000 \u0000 \u0000 \u0000Die strahleninduzierte Pfropfpolymerisation von 4-Vinylpyridin (VP) und 1 -Vinylimidazol (VIm) auf ein Styrol-Isopren-StyroI-Blockcopolymeres (SIS) sowie die Gasdurchlassigkeit von daraus hergestellten Membranen wurde untersucht. Eine Komplexierung der modifizierten SIS-Copolymeren (SIS-g-VP bzw. SIS-g-VIm) mit Cobalt enthaltenden Schiffschen Basen (CoS) als fixierte Sauerstofftrager verbesserte deren Sauerstoffdurchlassigkeit. Der Mechanismus des Sauerstofftransports wird diskutiert.","PeriodicalId":7808,"journal":{"name":"Angewandte Makromolekulare Chemie","volume":"9 1","pages":"31-41"},"PeriodicalIF":0.0,"publicationDate":"1994-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84277828","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}

{"title":"Effect of a curing accelerator on the glass transition temperature of non‐stoichiometric epoxy amine networks","authors":"V. Strehmel, Kalina Deltschewa, K. Häusler, K. Schröter","doi":"10.1002/APMC.1994.052200109","DOIUrl":"https://doi.org/10.1002/APMC.1994.052200109","url":null,"abstract":"Networks were prepared from Bisphenol A diglycidylether and 4,4′-diaminodiphenylmethane both in the presence of different amounts of imidazole and in the absence of any accelerator. The ratio of epoxy groups to amino hydrogen was varied: the networks were made with amino hydrogen excess, a stoichiometric ratio of epoxy groups to amino hydrogen, and an epoxy excess. The resulting networks were investigated by thermomechanical analysis, by torsion pendulum analysis and by uniaxial compression modulus measurements in the rubbery-plateau zone. Further characterization was done by sol gel analysis of the cured samples. It was shown that imidazole does not significantly influence the glass transition temperature and the soluble content of the samples of an excess of amino hydrogen was used. In the case of a stoichiometric ratio of epoxy groups to amino hydrogen and in the case of an epoxy excess, imidazole considerably influences the glass transition temperature of the networks. A dependence of the soluble content of the samples on imidazole concentration used for network synthesis was found mainly in epoxy excess systems. Netzwerke aus Bisphenol-A-diglycidylether und 4,4′-Diaminodiphenylmethan wurden sowohl in Gegenwart unterschiedlicher Imidazolkonzentrationen als auch in Abwesenheit von Beschleunigern hergestellt. Dabei wurde das Verhaltnis von Epoxidgruppen zu Aminwasserstoff variiert. Es wurde sowohl ein Uberschus an Aminwasserstoff als auch an Epoxidgruppen sowie ein stochiometrisches Verhaltnis von Epoxidgruppen zu Aminwasserstoff eingesetzt. Die Netzwerke wurden mittels thermomechanischer Analyse, Torsionspendelanalyse und uniaxialer Kompressionsmodulmessungen im Kautschukplateau untersucht. Weiterhin wurde eine Sol-Gel-Analyse der vernetzten Proben durchgefuhrt. Es wird gezeigt, das Imidazol bei Einsatz eines Uberschusses an Aminwasserstoff keinen signifikanten Einflus auf die Glasubergangstemperatur und den loslichen Anteil der Proben hat. Im Falle eines stochiometrischen Verhaltnisses von Epoxidgruppen zu Aminwasserstoff oder eines Epoxidharzuberschusses hat Imidazol einen beachtlichen Einflus auf die Glasubergangstemperatur der synthetisierten Netzwerke. Eine Abhangigkeit des loslichen Anteils der Proben von der Imidazolkonzentration konnte hauptsachlich bei Netzwerken festgestellt werden, die mit Epoxiduberschus synthetisiert wurden.","PeriodicalId":7808,"journal":{"name":"Angewandte Makromolekulare Chemie","volume":"251 1","pages":"99-109"},"PeriodicalIF":0.0,"publicationDate":"1994-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75490183","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}

{"title":"Study of the surface properties of ultrathin films of poly(dimethylsiloxane)‐polyamide multiblock copolymers","authors":"A. Kishida, T. Furuzono, T. Ohshige, I. Maruyama, Matsumoto Takeo, Haruhiko Itoh, M. Murakami, M. Akashi","doi":"10.1002/APMC.1994.052200108","DOIUrl":"https://doi.org/10.1002/APMC.1994.052200108","url":null,"abstract":"Ultrathin films of poly(dimethylsiloxane)-polyamide copolymers (PAS) with different silicone contents were prepared by the methods of water casting and spin coating. The surface properties of the films were investigated in detail using contact angle measurements and X-ray photoelectron spectroscopy (XPS). The water-cast films were thin enough to be applicable as laminate films for an artificial lung or an air-separator for oxygen-enrichted air. Uniform and ultrathin films were obtained by the spin coating method. XPS and contact angle measurements suggested that poly(dimethylsiloxane) segments were condensed at the outermost surface of spin-coated PAS films. XPS measurements also revealed that the surface properties of PAS were affected by the molding method, especially the solvent evaporation conditions. \u0000 \u0000 \u0000 \u0000Ultradunne Filme aus Polydimethylsiloxan(PDMS)-Polyamid-Copolymeren (PAS) mit unterschiedlichen Silikonanteilen wurden durch Filmgiesen auf Wasser und Rotationsbeschichten hergestellt. Die Oberflacheneigenschaften der Filme wurden mittels Kontaktwinkelmessungen und Rontgenphotoelektronenspektroskopie (XPS) untersucht. Die auf Wasser gegossenen Filme waren dunn genug, um als Laminatfilme in kunstlichen Lungen oder als Trennmembranen zur Sauerstoffanreicherung von Luft Anwendung finden zu konnen. Gleichmasig dicke und ultradunne Filme wurden durch Rotationsbeschichten erhalten. Aus den XPS- und Kontaktwinkelmessungen kann geschlossen werden, das sich die PDMS-Segmente an der Oberflache der Filme anreichern. Aus den XPS-Messungen geht auserdem hervor, das die Oberflacheneigenschaften von PAS von der Herstellungsmethode, insbesondere von den Bedingungen der Losemittelverdampfung abhangen.","PeriodicalId":7808,"journal":{"name":"Angewandte Makromolekulare Chemie","volume":"54 1","pages":"89-97"},"PeriodicalIF":0.0,"publicationDate":"1994-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91331491","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}

{"title":"Adsorption of cis‐1,4‐polyisoprene at solid/liquid interface","authors":"V. Vangani, A. Rakshit","doi":"10.1002/apmc.1994.052200103","DOIUrl":"https://doi.org/10.1002/apmc.1994.052200103","url":null,"abstract":"The adsorption of cis-1,4-polyisoprene on alumina and silica gel was studied at three temperatures. The solvents used were toluene, chlorobenzene and various mixtures of both. The adsorption from the mixtures of the solvents was much less than from either of the pure solvents. The amount of adsorption was an inverse function of temperature. The thermodynamic quantities of adsorption at infinite dilution were obtained by extrapolation and at isosteric conditions. They were computed and discussed for all the systems. \u0000 \u0000 \u0000 \u0000Die Adsorption von Poly(cis-1,4-isopren) an Aluminiumoxid- und Siliziumdioxid-Oberflachen wurde bei verschiedenen Temperaturen untersucht. Die Adsorptionsausbeute verhielt sich umgekehrt proportional zur Temperatur und war aus Toluol- und Chlorbenzol-Losungen groser als aus Mischungen von Toluol und Chlorbenzol. Die thermodynamischen Adsorptionsparameter bei unendlicher Verdunnung und isosteren Bedingungen wurden durch Extrapolation ermittelt und fur alle untersuchten Systeme diskutiert.","PeriodicalId":7808,"journal":{"name":"Angewandte Makromolekulare Chemie","volume":"62 1","pages":"21-37"},"PeriodicalIF":0.0,"publicationDate":"1994-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85766917","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}

{"title":"Functionalization of carbon fibres","authors":"E. Palma, L. Ibarra","doi":"10.1002/APMC.1994.052200110","DOIUrl":"https://doi.org/10.1002/APMC.1994.052200110","url":null,"abstract":"This work reports on a study conducted to achieve carbon fibre functionalization by means of a diazide derivative(p-(azidosulfonyl)benzoyl azide) in two stages. The first stage comprises surface oxidation of the fibres, which causes an increase of the number of superficial COOH groups. During the second stage the oxidated fibres are brought to react with the diazide derivative via the isocyanate group, obtained by means of the Curtius transposition of the carbonyl azide groups. Fibre oxidation depends on reaction time, following a similar patterns as the one described for carbon black particles. Oxidized fibres functionalization is evidenced both in the progressive decreases in SO2N3 groups in the reagent solution and through differential scanning calorimetry analysis (DSC), which shows an exothermal peak around 190°C due to the decomposition of the azide grafted onto the carbon fibre. \u0000 \u0000 \u0000 \u0000The degree of attainable functionalization is a function of COOH groups concentration, generated during fibre oxidation, and the ratio of the functionalizing agent with regard to the carboxy groups formed. \u0000 \u0000 \u0000 \u0000Die zweistufige Funktionalisierung von Kohlenstoffasern mit einem Diazidderivat(p-(Azidosulfonyl)benzoylazid) wurde untersucht. Wahrend einer ersten Phase wird die Faseroberflache oxidiert, wodurch die Konzentration der COOH-Gruppen auf der Faser erhoht wird. In der zweiten Stufe reagieren die oxidierten Fasern mit dem Diazidderivat uber die Isocyanatgruppe, die bei der Curtius-Umlagerung der Carbonylazidgruppe gebildet wird. Die Faseroxidierung ist abhangig von der Reaktionszeit und nimmt einen ahnlichen Verlauf wie die von Rusteilchen. Die Funktionalisierung der oxidierten Fasern wird anhand der progressiven Abnahme der SO2N3-Gruppen bewiesen sowie anhand der DSC-Kurven der Fasern, bei denen ein exothermer Peak bei etwa 190°C erscheint, der sich aus dem Abbau des an die Kohlenstoffasern gebundenen Azids ergibt. Der jeweils zu erreichende Funktionalisierungsgrad ist abhangig vom Gehalt an durch die Faseroxidierung entstandenen COOH-Gruppen sowie dem Verhaltnis zwischen dem Funktionalisierungsagens und dem Gehalt an Carboxygruppen.","PeriodicalId":7808,"journal":{"name":"Angewandte Makromolekulare Chemie","volume":"45 1","pages":"111-122"},"PeriodicalIF":0.0,"publicationDate":"1994-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85292183","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}