Relevant bibliographies by topics / Polyaddition

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Polyaddition'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 April 2025

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Journal articles on the topic "Polyaddition"

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Karpov, Sergei V., Artem Iakunkov, Dmitry A. Chernyaev, Vladimir G. Kurbatov, Georgiy V. Malkov, and Elmira R. Badamshina. "A Theoretical Investigation of the Polyaddition of an AB2+A2+B4 Monomer Mixture." Polymers 16, no. 3 (2024): 426. http://dx.doi.org/10.3390/polym16030426.

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Hyperbranched polymers (HBPs) are widely applied nowadays as functional materials for biomedicine needs, nonlinear optics, organic semiconductors, etc. One of the effective and promising ways to synthesize HBPs is a polyaddition of AB2+A2+B4 monomers that is generated in the A2+CB2, AA′+B3, A2+B′B2, and A2+C2+B3 systems or using other approaches. It is clear that all the foundational features of HBPs that are manufactured by a polyaddition reaction are defined by the component composition of the monomer mixture. For this reason, we have designed a structural kinetic model of AB2+A2+B4 monomer mixture polyaddition which makes it possible to predict the impact of the monomer mixture’s composition on the molecular weight characteristics of hyperbranched polymers (number average (DPn) and weight average (DPw) degree of polymerization), as well as the degree of branching (DB) and gel point (pg). The suggested model also considers the possibility of a positive or negative substitution effect during polyaddition. The change in the macromolecule parameters of HBPs formed by polyaddition of AB2+A2+B4 monomers is described as an infinite system of kinetic equations. The solution for the equation system was found using the method of generating functions. The impact of both the component’s composition and the substitution effect during the polyaddition of AB2+A2+B4 monomers on structural and molecular weight HBP characteristics was investigated. The suggested model is fairly versatile; it makes it possible to describe every possible case of polyaddition with various monomer combinations, such as A2+AB2, AB2+B4, AB2, or A2+B4. The influence of each monomer type on the main characteristics of hyperbranched polymers that are obtained by the polyaddition of AB2+A2+B4 monomers has been investigated. Based on the results obtained, an empirical formula was proposed to estimate the pg = pA during the polyaddition of an AB2+A2+B4 monomer mixture: pg = pA = (−0.53([B]0/[A]0)1/2 + 0.78)υAB2 + (1/3)1/2([B]0/[A]0)1/2, where (1/3)1/2([B]0/[A]0)1/2 is the Flory equation for the A2+B4 polyaddition, [A]0 and [B]0 are the A and B group concentration from A2 and B4, respectively, and υAB2 is the mole fraction of the AB2 monomer in the mixture. The equation obtained allows us to accurately predict the pg value, with an AB2 monomer content of up to 80%.
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Sato, Eiichi, Tsutomu Yokozawa, and Takeshi Endo. "Polyaddition of diallenes: radical polyaddition of dithiols to 1,4-bis(allenyloxy)benzene." Macromolecules 26, no. 19 (1993): 5185–86. http://dx.doi.org/10.1021/ma00071a031.

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Petrov, A. O., Georgiy V. Malkov, Sergei V. Karpov, A. V. Shastin, and A. V. Bakeshko. "Kinetic Study of the Polyaddition of Azide-Alkyne AB2 Monomers in Nonisotermic Conditions." Key Engineering Materials 816 (August 2019): 151–56. http://dx.doi.org/10.4028/www.scientific.net/kem.816.151.

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Nowadays, hyperbranched polymers (HBP) are obtained by different polycondensation and polyaddition reactions [1]. Almost interest is the reaction of 1,3-dipolar cycloaddition of azides to alkynes (1,3-DCA) [2, 3]. There is a series of papers dedicated to the preparation of triazine-triazole HBPs [4, 5, 6]. These polymers were obtained by the reaction of azido-acetylene AB2 monomers polyaddition: 2-azido-4,6-bis (propyne-2-yloxy) -1,3,5-triazine (ABPOT) and 2,4-diazido-6- (propine-2-yloxy) -1,3,5-triazine (DAPOT) (Fig. 1).
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Yamaguchi, Isao, Kohtaro Osakada, and Takakazu Yamamoto. "Ru(0) complex catalyzed polyaddition." Polymer Bulletin 42, no. 2 (1999): 141–47. http://dx.doi.org/10.1007/s002890050445.

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Yiamsawas, Doungporn, Grit Baier, Eckhard Thines, Katharina Landfester, and Frederik R. Wurm. "Biodegradable lignin nanocontainers." RSC Adv. 4, no. 23 (2014): 11661–63. http://dx.doi.org/10.1039/c3ra47971d.

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Li, Guangyao, Zhicheng Pan, Zhanyu Jia, et al. "An effective approach for fabricating high-strength polyurethane hydrogels with reversible photochromic performance as a photoswitch." New Journal of Chemistry 45, no. 14 (2021): 6386–96. http://dx.doi.org/10.1039/d1nj00429h.

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Iwamori, Ryota, Ryota Sato, Junpei Kuwabara, and Takaki Kanbara. "Nonstoichiometric hydroarylation polyaddition for synthesis of pyrrole-based poly(arylenevinylene)s." Polymer Chemistry 13, no. 3 (2022): 379–82. http://dx.doi.org/10.1039/d1py01425k.

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Davletbaeva, I. M., G. R. Nurgaliyeva, A. I. Akhmetshina, et al. "Porous polyurethanes based on hyperbranched amino ethers of boric acid." RSC Advances 6, no. 112 (2016): 111109–19. http://dx.doi.org/10.1039/c6ra21638b.

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Jiao, Caicai, Lilong Gao, Bing Yu, Hailin Cong, and Youqing Shen. "Mild polyaddition and polyalkylation based on the carbon–carbon bond formation reaction of active methylene." RSC Advances 9, no. 69 (2019): 40455–61. http://dx.doi.org/10.1039/c9ra08155k.

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Sheng, Xingfeng, Guanjie Ren, Yusheng Qin, Xuesi Chen, Xianhong Wang, and Fosong Wang. "Quantitative synthesis of bis(cyclic carbonate)s by iron catalyst for non-isocyanate polyurethane synthesis." Green Chemistry 17, no. 1 (2015): 373–79. http://dx.doi.org/10.1039/c4gc01294a.

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Dissertations / Theses on the topic "Polyaddition"

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Mannchen, Hannah [Verfasser]. "(Photo)latente Präkatalysatoren für die Polyaddition / Hannah Mannchen." München : Verlag Dr. Hut, 2016. http://d-nb.info/1097818519/34.

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Bucksch, Lars. "Sprühpolymerisation Herstellung von thermoplastischen Polyurethanpulvern durch Sprüh-Polyaddition." Berlin Wiss.-und-Technik-Verl, 2008. http://d-nb.info/992894336/04.

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Tadjang, Ambo Upe. "Greffage de la cellulose papetière par polyaddition électrophile des oxazolines." Grenoble INPG, 1987. http://www.theses.fr/1987INPG0087.

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La premiere partie traite de la synthese d'esters de cellulose, ces groupements servant de centres actifs pour la polymerisation ulterieure. La deuxieme partie traite de la synthese et de la caracterisation par spectroscopie ir et rmn**(1)h de diverses oxazolines. La troisieme partie est consacree a la polymerisation electrophile d'oxazolines, celle-ci etant amorcee par le tosylate de methyle, le triflate de methyle ou d'ethyle et l'iodure de methyle. Le greffage de la cellulose est etudie dans la quatrieme partie. Une attention particuliere est portee a l'influence sur le taux de greffage du nombre de centres actifs de la cellulose, de la concentration du monomere, de la duree et de la temperature de polymerisation. Appliquee a des pates cellulosiques, cette methode s'est montree l'une des meilleures methodes de greffage tant au point de vue rendement que du taux de greffage
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Tadjang, Ambo Upe. "Greffage de la cellulose papetière par polyaddition électrophile des oxazolines." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb376100984.

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Djelali, Nacer-Eddine. "Electropolymérisation cationique amorcée par dissolution anodique." Grenoble 1, 1992. http://www.theses.fr/1992GRE10142.

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La polymerisation cationique est amorcee par certains cations metalliques generes par dissolution anodique. La reaction peut se propager meme en presence de tres fortes concentrations d'anions pourvu que ceux-ci ne soient ni basiques ni nucleophiles. C'est le cas des anions pf#6#, clo#4#, sbf#6# et bf#4# quoique ce dernier peche par son instabilite. Le degre d'oxydation des cations metalliques obtenus electrochimiquement en milieu non complexant a ete determine par coulometrie, gravimetrie et spectrophotometrie d'absorption atomique. Il se forme v#4#+, cr#6#+; le mercure donne hg#+ en milieu non complexant et hg#2#+ en milieu complexant. Als+ forme est oxyde en al#3#+ par l'ion clo#4#. Divers monomeres ont ete testes: pi-donneurs (styrene, isoprene, methylstyrene) n, pi-donneurs (isobutylvinylether, allylglycidylether), n donneurs (lactones, hexamethylcyclotrisiloxane, 1,3-dioxolane). Les polymeres obtenus ont ete analyses et leurs masses sont comparables avec celles que l'on obtient habituellement dans les polymerisations cationiques malgre les conditions defavorables a ce type de reaction
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Descours-Michallet, Catherine. "Synthèse directe d'oligoisobutène thiocyano- et isothiocyano-téléchéliques : comparaison avec les réactions sur molécules modèles." Grenoble INPG, 1992. http://www.theses.fr/1992INPG0049.

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Ce travail concerne la synthese en une seule etape d'oligomeres du 2-methylpropene contenant une fonction isothiocyanate terminale. Son but est de preciser les conditions de realisation de ce nouveau type de polymerisation cationique. La methode utilisee permet l'obtention d'oligomeres du 2-methylpropene contenant a l'une de leurs extremites le groupement tert-butyl ou phenyl et a l'autre extremite la fonction isothiocyanate ou thiocyanate. La fonctionnalisation par le groupement thiocyanate a ete favorisee en presence de la 2,6-di-tert-butyl-4-methylpyridine. Le mecanisme d'amorcage de la polymerisation par deux isothiocyanates organiques tertiaires a ete aborde par analyses spectroscopiques (spectrometrie de masse, resonance magnetique nucleaire, infrarouge) et par analyse chromatographique (chromatographie en phase gazeuse). La caracterisation des oligomeres a ete realisee par rmn, ir et chromatographie d'exclusion sterique. L'utilisation d'amorceurs isothiocyanates constitue un domaine entierement nouveau en polymerisation par polyaddition electrophile
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Bathfield, Maël. "Synthèse d'agents de contrôle originaux our l'obtention de copolymères α-fontionnels par le procédé Raft : application à l'élaboration de particules à chevelure contrôlée". Lyon 1, 2006. http://www.theses.fr/2006LYO10195.

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Le procédé RAFT (transfert de chaîne réversible par addition-fragmentation) est une technique de polymérisation radicalaire contrôlée de choix permettant d’obtenir directement des chaînes polymères α-fonctionnelles de longueur contrôlée. La synthèse préalable d’agents de transfert de chaîne (ATC) fonctionnalisés est une étape primordiale dans cette optique. Dans ce travail de thèse, une stratégie simple a été développée pour la synthèse d’ATC fonctionnalisés utilisant des ATC précurseurs originaux appartenant à la famille des dithioesters. Cette nouvelle voie de synthèse a préalablement été validée à l’aide d’un composé modèle avant d’être appliquée à la synthèse de dithioesters portant un ligand biologique tel que la biotine, un phospholipide ou un dérivé carbohydrate. La polymérisation de type RAFT de la N-acryloylmorpholine en présence de chacun de ces nouveaux bio-ATC vérifie tous les critères d’une polymérisation contrôlée. En particulier, les polymères obtenus ont une distribution des masses molaires très étroite (Ip&lt;1,1). De plus, la présence du ligand biologique en extrémité α des chaînes a été confirmée par RMN 1H et par spectrométrie de masse MALDI-ToF. Enfin, cette stratégie de synthèse de polymères α-bio-fonctionnels a été utilisée pour la conception de structures macromoléculaires répondant aux critères requis pour des applications dans le diagnostic biologique : 1- un copolymère réactif de masse molaire élevée précurseur de sondes de détection « super-fluorescentes » a été synthétisé à partir du dithioester-biotine ; 2- Un procédé de polymérisation mixte associant le principe de la polymérisation en dispersion avec celui de la polymérisation de type RAFT a été imaginé. L’utilisation, dans ce procédé, de polymères α-fonctionnels synthétisés à partir du dithioester-sucre a permis l’élaboration de particules fonctionnalisées à chevelure contrôlée potentiellement utilisables pour la capture d’agents pathogènes<br>α-functionalized polymer of controlled chain length can be designed by the use of the RAFT (Reversible Addition Fragmentation chain Transfer) process, which is a controlled radical polymerization technique. The first requirement for this strategy is to synthesize functionalized chain transfer agents (CTA). In this research work, a simple strategy is presented: original dithioester precursors CTA were designed and used to provide a large variety of functionalized dithioesters. The efficiency of this strategy was previously checked with a model compound, and was then applied to the synthesis of dithioesters bearing biomolecules (bio-CTA) like a biotin, a phospholipid or a carbohydrate derivative. RAFT polymerization of N-acryloylmorpholine mediated by each of these new bio-CTAs is well controlled, the resulting polymer exhibiting narrow molar mass distributions (PDI&lt;1. 1). Moreover, 1H NMR and MALDI-ToF mass spectrometry analyses confirmed the presence of the biological compound at the α-end of the chains. Finally, the same strategy (leading to α-bio-functionalized polymers) was used to elaborate macromolecular structures for applications in biological diagnostic tests: 1- a high molecular weight reactive random copolymer was synthesized from the biotin-dithioester, and may serve as “highly-fluorescent” detection probes; 2 - Functionalized particles with controlled hair were obtained via dispersion polymerization using α-functionalized polymer chains bearing a carbohydrate derivative (potentially able to capture pathogenic agents) as precursor stabilizer
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Denizot, Vincent. "Polymères haute performance polymérisables par ionisation : Etude de systèmes propargyliques et bismaleimides." Pau, 1993. http://www.theses.fr/1993PAUU3029.

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Le but de cette thèse est l'étude de polymères haute performance polymérisables sous irradiation. Après avoir rappelé quelques généralités concernant les polymères thermostables et les rayonnements ionisants, nous avons entrepris l'étude de prépolymères fonctionnalisés propargylique ou maleimide. Dans une première partie, nous avons présenté l'étude cinétique de la polymérisation des composés propargyliques. Ainsi, lors de l'étude thermique nous avons mis en évidence la formation d'un composé intermédiaire de type chromène, polymérisant par la suite. Toutefois, dans les conditions d'irradiation utilisées, les composés propargyliques et les chromènes se sont montrés non réactifs. En revanche, les composés polypropargyliques polymérisent à la fois par voie thermique et sous bombardement électronique, pour donner un matériau réticulé à haute stabilité thermique, notamment lorsqu'ils sont associés à un comonomère méthacrylique. Dans une seconde partie, nous développons la polymérisation d'un oligomère téléchélique à terminaison maleimide en présence de diluant réactif. La polymérisation par irradiation sous électrons ou rayons X apporte des informations importantes sur l'influence de la pureté du prépolymère, la nature de la source d'irradiation, la dose d'irradiation, le taux de diluant réactif et l'ajout de catalyseur.
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Lepais-Masmejean, Michèle. "Préparation de copolymères AA-ADQUAT MC (acide acrylique-chlorure de triméthylaminoéthylacrylate), par voie radicalaire en phase homogène et dispersée : caractérisation des polymères et des gels." Lyon 1, 1992. http://www.theses.fr/1992LYO10295.

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Des gels ioniques ont ete prepares par copolymerisation radicalaire (en solution et en suspension inverse) de monomeres monofonctionnels ioniques, l'acide acrylique (aa) et le chlorure de trimethylaminoethylacrylate (adquat mc) en presence de faibles quantites d'agent reticulant, le methylenebisacrylamide (mba). Ces gels sont obtenus a divers degres d'ionisation, a partir du monomere (aa) a differents taux de salification. Les parametres cinetiques de la copolymerisation de ces deux monomeres ont tout d'abord ete determines experimentalement en solution aqueuse (par analyse rmn #1h et #1#3c). Les resultats de composition, rapport de reactivite et evolution de la microstructure en fonction de la conversion ont ete compares avec ceux obtenus par simulation des reactions, en fonction du ph (2,2-4,5-6,7). En raison de ses avantages, le procede de polymerisation en suspension inverse a ete retenu (maintien d'une faible viscosite au sein de l'emulsion au cours de la reaction, obtention de polymeres de fortes masses moleculaires). Les emulsions inverses etant des systemes thermodynamiquement tres instables, il a ete propose une methode de calcul, basee sur les parametres de solubilite des differents composes entrant dans la formulation (solvant, couple de tension-actifs, et surtout presence de monomeres dans la phase aqueuse) permettant d'optimiser les conditions de stabilisation de l'emulsion. Les caracteristiques de la polymerisation (cinetique, granulometrie) ont ensuite ete etudiees en fonction de la nature de l'amorceur (hydro ou liposoluble), de la methode d'addition des phases continue et dispersee, ainsi que de la concentration en agent reticulant (mba), principalement dans le cas de l'aa a 80% de taux de salification. La cinetique de gonflement et la valeur du gonflement ont ete etudiees en fonction de la densite de reticulation et du degre d'ionisation de ces polymeres, par immersion en milieux aqueux et salin (nacl), en particulier a l'aide d'une methode basee sur la spectrometrie micro-onde
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Loiseau, Julien. "Polymérisation radicalaire contrôlée de type RAFT (Reversible Addition-Fragmentation chain Transfer) de l'acide acrylique." Lyon 1, 2004. http://www.theses.fr/2004LYO10049.

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Books on the topic "Polyaddition"

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Kuhrau, Martin Gordon. Neue Polymere durch repetitive Diels-Alder Polyaddition. 1992.

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Jost, Wolfgang H. Polykondensation-Polyaddition: Neue Wege zur Stapelung von überbrückten [14]Annulenen. 1993.

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Paulo, Christophe, Armin Michel, Shahzad Barghi, and Judit E. Puskas. Ionic Polymerizations and Related Processes. Springer, 2012.

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(Contributor), Christophe Paulo, Judit E. Puskas (Editor), Armin Michel (Editor), and Shahzad Barghi (Editor), eds. Ionic Polymerizations and Related Processes. Springer, 1999.

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Group, Research. The 2000 World Market Forecasts for Imported Condensation, Polycondensation and Polyaddition Products. Icon Group International, 2000.

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Knapp, Ralf. Synthese vollaromatischer Hauptketten-Metallkomplex-Polymerer via Palladium-katalysierte Polykondensation und koordinierende Polyaddition. 1994.

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Group, Research, Polycondensation The Condensation, and Polyaddition Products Research Group. The 2000 World Forecasts of Condensation, Polycondensation and Polyaddition Products Export Supplies (World Trade Report). 2nd ed. Icon Group International, 2000.

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Condensation, Polycondensation The, Polyaddition Products Research Group, and Polycondensatio And The Condensation. The 2000 Import and Export Market for Condensation, Polycondensation and Polyaddition Products in Europe (World Trade Report). 2nd ed. Icon Group International, 2000.

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Condensation, Polycondensation The, Polyaddition Products Research Group, and Polycondensatio And The Condensation. The 2000 Import and Export Market for Condensation, Polycondensation and Polyaddition Products in Asia (World Trade Report). 2nd ed. Icon Group International, 2000.

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Condensation, Polycondensation The, Polyaddition Products Research Group, and Polycondensatio And The Condensation. The 2000 Import and Export Market for Condensation, Polycondensation and Polyaddition Products in Africa (World Trade Report). 2nd ed. Icon Group International, 2000.

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Book chapters on the topic "Polyaddition"

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Gooch, Jan W. "Polyaddition." In Encyclopedic Dictionary of Polymers. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_8947.

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Elias, Hans-Georg. "Polycondensation and Polyaddition." In Macromolecules. Wiley-VCH Verlag GmbH, 2014. http://dx.doi.org/10.1002/9783527627219.ch13.

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Donovan, Brian R., and Derek L. Patton. "Step Polyaddition Polymerizations, an Overview." In Encyclopedia of Polymeric Nanomaterials. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-36199-9_412-1.

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Donovan, Brian R., and Derek L. Patton. "Step Polyaddition Polymerizations, an Overview." In Encyclopedia of Polymeric Nanomaterials. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-29648-2_412.

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Penczek, S., P. Kubisa, P. Klosinski, T. Biela, and A. Nyk. "Polyaddition of Epoxides and Diepoxides to the Acids of Phosphorus." In ACS Symposium Series. American Chemical Society, 1992. http://dx.doi.org/10.1021/bk-1992-0496.ch019.

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Penczek, S., P. Kubisa, and A. Nyk. "Polyaddition of H3PO4, and Its Derivatives to Diepoxides Via Activated Monomer Mechanism." In Macromolecular Engineering. Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-1905-8_21.

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"Polyaddition." In Encyclopedic Dictionary of Polymers. Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-30160-0_8804.

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"polyaddition, n." In Oxford English Dictionary, 3rd ed. Oxford University Press, 2023. http://dx.doi.org/10.1093/oed/2586005295.

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Zhang, Hongmin, and Eli Ruckenstein. "Self-Polyaddition of Hydroxyalkyl Vinyl Ethers *." In Solution and Surface Polymerization. CRC Press, 2019. http://dx.doi.org/10.1201/9780429027420-14.

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Guichard, G. "By Polyaddition of Diamines and Diisocyanates." In Four Carbon-Heteroatom Bonds. Georg Thieme Verlag KG, 2005. http://dx.doi.org/10.1055/sos-sd-018-00948.

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Conference papers on the topic "Polyaddition"

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Montag, Petr, and Alena Kalendova. "INVESTIGATION OF RECYCLED POLYOL PRODUCED FROM SEMI-RIGID POLYURETHANE FOAM OUTSOURCED FROM THE AUTOMOTIVE INDUSTRY." In 23rd SGEM International Multidisciplinary Scientific GeoConference 2023. STEF92 Technology, 2023. http://dx.doi.org/10.5593/sgem2023/4.1/s18.22.

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Polyurethane, as a versatile polymer prepared by the polyaddition of isocyanates and hydroxyl group containing compounds, is widely used in the automotive industry and with an upcoming change of European legislation becomes recycling increasingly important as an alternative to landfilling or incineration. Glycolysis is one of the chemical degradation processes used to transform polyurethane waste using simple glycols as the degradation agents into a raw material. Single phase glycolysis was used to produce recycled polyol from polyurethane semi-rigid foam dedicated for headliner production. This paper is focused on comparison of obtained recycled polyol with the original fossil-based polyol with effect on hydroxyl number and viscosity. Infrared spectroscopy was carried out for identification of organic compounds. The result shows increased hydroxyl number and viscosity of recycled polyol versus original polyol. Reactivity of mixture containing recycled polyol was slower, but foam appearance was comparable to foam produced from original polyol. The research was supported by the BASF company.
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Elsner, A. L., C. Kunde, W. Togrund, K. Bobzin, W. Wietheger, and E. Burbaum. "UV-Dual Curing Sealers for Short Cycling Times of Thermally Sprayed Parts." In ITSC2021, edited by F. Azarmi, X. Chen, J. Cizek, et al. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.itsc2021p0346.

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Abstract The advantages of UV-curing polymers are well known and used in various coating and adhesive applications. Curing times of a few seconds and long application windows allowing an increased throughput in series production. The use of UV-curing polymers in sealers is beneficial, but so far insufficient due to only surface curing. With a newly developed dual-cure mechanism in sealers, it is now possible to combine deep penetration curing and surface curing. The hybrid sealers combine radical polymerization with subsequent polyaddition or polycondensation. The development of sealers for thermal sprayed (TS) coatings involves an extensive requirement profile. This includes properties such as corrosion protection, penetration depth and processing times. High penetration depths of the sealant into the coating system are important to ensure a protection over the full lifetime of the TS coatings. The depth of penetration of the developed sealers into various TS coatings was determined by measuring the gas permeability in a specially developed test procedure. The corrosion protection effect in combination with TS coatings was determined by measuring the cell voltage. In summary, two UV dual-cure sealers have been developed to seal TS coatings with deep penetration and corrosion protection.
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