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Relevant bibliographies by topics / Polykondensation

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Academic literature on the topic 'Polykondensation'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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Journal articles on the topic "Polykondensation"

1

Facchetti, Antonio, Luigi Vaccaro, and Assunta Marrocchi. "Durch direkte arylierende Polykondensation zu halbleitenden Polymeren." Angewandte Chemie 124, no. 15 (March 22, 2012): 3578–81. http://dx.doi.org/10.1002/ange.201200199.

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Beryozkina, Tetyana, Ksenia Boyko, Natalya Khanduyeva, Volodymyr Senkovskyy, Marta Horecha, Ulrich Oertel, Frank Simon, Manfred Stamm, and Anton Kiriy. "Durch oberflächeninitiierte Suzuki-Polykondensation zu gepfropftem Polyfluoren." Angewandte Chemie 121, no. 15 (March 4, 2009): 2733–36. http://dx.doi.org/10.1002/ange.200806217.

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Voit, Brigitte. "„Kondensierende Kettenpolymerisation“ – ein Weg zur lebenden Polykondensation?" Angewandte Chemie 112, no. 19 (October 2, 2000): 3549–51. http://dx.doi.org/10.1002/1521-3757(20001002)112:19<3549::aid-ange3549>3.0.co;2-x.

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4

Steffan, Roland. "Computer-simulation der polykondensation von phenol mit formaldehyd." Angewandte Makromolekulare Chemie 131, no. 1 (April 1985): 25–44. http://dx.doi.org/10.1002/apmc.1985.051310103.

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Rafler, G., E. Bonatz, H. D. Sparing, and B. Otto. "Zur kinetik der Polykondensation von Terephthalsäure und Ethylenglykol in dünnen Schmelzeschichten." Acta Polymerica 38, no. 1 (January 1987): 6–10. http://dx.doi.org/10.1002/actp.1987.010380102.

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6

Draeger, Andreas, and Ralf Gesthuisen. "Neuronales Netz zur Schätzung des Polymerisationsgrads bei der Polykondensation zu Polyethylenterephthalat." Chemie Ingenieur Technik 68, no. 10 (October 1996): 1320–23. http://dx.doi.org/10.1002/cite.330681018.

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Boury, Bruno, Frédéric Ben, and Robert J. P. Corriu. "Hydrolytische-Polykondensation von Festkörpern zur Herstellung von kristallinen Hybrid-Materialien auf Silicatbasis." Angewandte Chemie 113, no. 15 (August 3, 2001): 2946–48. http://dx.doi.org/10.1002/1521-3757(20010803)113:15<2946::aid-ange2946>3.0.co;2-1.

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Dauben, Michael, Kristina Platkowski, and Karl-Heinz Reichert. "Kinetik der polykondensation von natriumsulfidhydrat und 1,4-dichlorbenzol zu poly(thio-1,4-phenylen)." Angewandte Makromolekulare Chemie 234, no. 1 (January 1996): 177–89. http://dx.doi.org/10.1002/apmc.1996.052340115.

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Jung, Jong Hwa, Yoshiyuki Ono, and Seiji Shinkai. "Chirale Silica-Spiralen durch Sol-Gel-Polykondensation von Tetraethoxysilan in einem Cholesterin-Organogel-System." Angewandte Chemie 112, no. 10 (May 15, 2000): 1931–33. http://dx.doi.org/10.1002/(sici)1521-3757(20000515)112:10<1931::aid-ange1931>3.0.co;2-b.

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Vinogradova, S. V., Ja S. Vygodskij, V. V. Koršak, G. L. Slonimskij, A. A. Askadskij, N. A. Čuročkina, V. V. Kazanceva, H. Raubach, and B. Falk. "Synthese und Eigenschaften von aromatischen Polyamiden, die durch Matrizen-Polykondensation bei niedrigen Temperaturen erhalten wurden." Acta Polymerica 41, no. 9 (September 1990): 489–92. http://dx.doi.org/10.1002/actp.1990.010410905.

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Dissertations / Theses on the topic "Polykondensation"

1

Schmelz, Oliver. "Synthesen von stäbchenförmigen, hochmolekularen Ruthenium(II)Koordinationspolymeren." [S.l.] : [s.n.], 2005. http://elib.tu-darmstadt.de/diss/000593.

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Schäfer, Jan. "Komplexe Polykondensation von Ethylenglykol in einem RF-Niederdruckplasma zur Bildung funktioneller Schichten." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=984385967.

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Boyko, Kseniya. "Suzuki and Kumada Surface Initiated Polycondensations: Novel Engineering Route to Conjugated Polymer Systems." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-67860.

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In the field of electronic organic materials, conjugated polymers (CPs) have attracted much attention in recent years. It has been well-established that performances of thin-film devices based on π-conjugated polymers, such as light-emitting diodes, field-effect transistors and photovoltaic cells, are strongly dependent on the organisation of the polymer molecules and their interactions with other constituents in multicomponent devices. The use of CPs in integrated circuits, solar cells, light-emitting diodes or sensors often requires their covalent fixation and patterning on various surfaces. CPs can be grafted to functionalized surfaces by (electro)chemical cross-linking; however, it is difficult to control a structural order within the cross-linked films. The attachment of CP chains to substrates by their end-points to form polymer brushes would be an interesting alternative, and could possibly be crucial for many devices requiring charge injection and charge transport processes. The main aim of this work, which was the synthesis of covalently grafted conjugated polymer brushes on solid substrates using a "grafting from" approach, was successfully performed. During the course of this work, the process of surface-initiated polycondensation was investigated. The newly developed method to selectively graft conjugated polymers from different substrates such as Si-wafers, quartz slides or modificated nanoparticles allowed us to produce different architectures which were earlier possible to prepare only non-conductive polymers. Exposure of the substrate with an activated surface layer into the monomer solution produced polymer brushes in a very economical way. Since only monomer was consumed for grafting from the surface. The grafting process was extensively investigated by different methods, and the thickness of the obtained poly(fluorene) films was elucidated by Null-ellipsometry and confirmed by the AFM scratch-test. Preliminary characteristics of the device, based on PS(Br)-core poly(octylfluorene)-shell nanoparticles, showed satisfactory results (such as turn-on voltage and electroluminescence in a blue region). They could be improved by replacement of the insulating PS(Br)-core of nanoparticles with other substances (semiconductive, etc.). There is still plenty of room for further development and improvement of the synthesis of poly(fluorene)-based polymer brushes. The polymer structures developed in this work can be utilized as an active layer in lab-on-chip devices. Alkyl groups in the 9th position of the poly(fluorene) monomer unit can be replaced by tailored receptors to detect specific species including small molecules, metal ions and biomolecules due to enhanced sensitivity through sensory signal amplification. Post-polymerization modifications may lead to highly water-swellable conjugated polyelectrolyte brushes. Also, polymerization of initially optically active fluorene-monomers may be the crucial step to the generation of a light source devices with a large degree of circularly polarized electroluminescence. This is of great interest for utilization as backlight for liquid crystalline displays. We believe that the utilization of covalently surface-immobilized conjugated polymers may have a great impact on the development of present-day technological processes.

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4

Keller, Tina [Verfasser]. "Synthese von Low-Bandgap Donor-Akzeptor- Copolymeren durch Direkt-C-H-Arylierungs- Polykondensation / Tina Keller." Wuppertal : Universitätsbibliothek Wuppertal, 2019. http://d-nb.info/1190649020/34.

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von, Irmer Jonas [Verfasser], Matthias [Akademischer Betreuer] Rehahn, and Christina M. [Akademischer Betreuer] Thiele. "Suzuki-Polykondensation hochmolekularer Poly-para-phenylene mittels Mikrowellenstrahlung / Jonas von Irmer ; Matthias Rehahn, Christina M. Thiele." Darmstadt : Universitäts- und Landesbibliothek, 2021. http://d-nb.info/1228074135/34.

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Anders, Susann. "Synthese und Funktionalisierung linearer und zyklischer aromatisch-aliphatischer Aminoketone vom MICHLERs Keton-Typ." Doctoral thesis, Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-201000511.

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In der vorliegenden Arbeit wird die Synthese linearer und zyklischer Aminoketone via nucleophiler aromatischer Substitution von fluorsubstituierten aromatischen Ketonen mit sekundären, aliphatischen Diaminen vorgestellt. Durch eine Adaption der Prozessparameter konnte eine elegante Methode zur Synthese fluorendgruppentragender Oligomere sowie von definierten Makrozyklen entwickelt werden. Die Modifizierung der Oligomere erfolgte sowohl durch Endgruppensubstitution als auch durch Reaktionen an der Carbonylgruppe am Oligomerrückgrat. Als Funktionalisierungsreagenzien wurden Mercaptoessigsäure, LAWESSONs Reagenz und N,N-Dimethylanilin eingesetzt. Die Umsetzung der Makrozyklen mit N,N-Dialkylanilinen ermöglicht die Synthese zyklischer Triphenylmethanfarbstoffe. Die Untersuchung der optischen Eigenschaften dieser zyklischen Kristallviolett-Derivate in Abhängigkeit des pH-Wertes und der Natur des Lösungsmittels sowie der Sensitivität gegenüber Cyanid-Ionen erfolgte mit Hilfe der UV/Vis-Spektroskopie.

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Erdmann, T., J. Back, R. Tkachov, A. Ruff, B. Voit, S. Ludwigs, and A. Kiriy. "Dithienosilole-based all-conjugated block copolymers synthesized by a combination of quasiliving Kumada and Negishi catalyst-transfer polycondensations." Royal Society of Chemistry, 2014. https://tud.qucosa.de/id/qucosa%3A36424.

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Herein, we present a quasi-living Negishi-type catalyst-transfer polycondensation of a zinc–organic DTSbased monomer which provides an access to narrowly distributed poly(4,4-bis(2-ethylhexyl)dithieno[3,2-b:20,30-d]silole (PDTS) with controlled molecular weight. The synthesis of well-defined all-conjugated diblock copolymers containing a PDTS block was accomplished by a combination of Kumada and Negishi catalyst-transfer polycondensations (KCTP and NCTP, respectively). Particularly, it was shown that living P3HT chains obtained by KCTP of magnesium–organic thiophene-based monomer efficiently initiate NCTP of zinc–organic DTS-based monomer. The purity of the DTS-based monomer was found to be a crucial factor for achieving a clean chain-growth polymerization process. A combination of physico-chemical methods was used to prove the success of the block copolymerization.

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8

Neuer, Björn [Verfasser]. "On the melting behavior of cyclic 1,4-butylene terephthalate for ring-opening polymerization and on polycondensation by enzymatic catalysis : Über das Schmelzverhalten von cyclischem 1,4-Butylenterephthalat für die ringöffnende Polymerisation und über die Polykondensation durch enzymatische Katalyse / Björn Neuer." Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky, 2020. http://d-nb.info/1223621065/34.

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Blum, Carsten. "Herstellung und Modifizierung von Nanopartikeln auf Basis von anorganischen Polykondensaten." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=971822034.

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10

Di, Pietro Riccardo, Tim Erdmann, Naixiang Wang, Xuhai Liu, David Gräfe, Johannes Lenz, Josef Brandt, et al. "The impact of molecular weight, air exposure and molecular doping on the charge transport properties and electronic defects in dithienyldiketopyrrolopyrrole- thieno[3,2-b]thiophene copolymers." Royal Society of Chemistry, 2016. https://tud.qucosa.de/id/qucosa%3A36273.

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We performed an in-depth study of high molecular weight poly[3,6-(dithiophene-2-yl)-2,5-di(2-octyldodecyl)-pyrrolo[3,4-c]pyrrole-1,4-dione-alt-thieno[3,2-b]thiophene] P(DPP2OD-TT) synthesized through the Stille coupling polycondensation in order to understand the correlation between molecular weight, processing conditions and charge transport. We observed a rapid increase in its aggregation in solution with increasing molecular weight which strongly limits the solubility and processability for weight average molecular weights beyond 200 kg mol⁻¹. This results in severe limitation in the charge transport properties of the polymer. We further observe the presence of bulk electronic defects in all different polymer batches that severely limit the current flow and manifest themselves in organic field effect transistors as apparent charge density dependence of the mobility. These defects are passivated by exposure to an ambient atmosphere, as confirmed by an increase in current and mobility that is no more charge density dependent. This is further confirmed by the result of chemical doping using 2,2-(perfluoronaphthalene-2,6-diylidene)dimalononitrile, F₆TCNNQ, which leads to the filling of the trap states and a higher charge density independent mobility of up to 1 cm2 V⁻¹ s⁻¹.

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Book chapters on the topic "Polykondensation"

1

Ritter, Helmut. "Synthese von Polymeren durch Polykondensation." In Makromoleküle I, 75–144. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-55956-7_4.

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2

"36.4 Polykondensationen." In Organische Chemie, edited by Eberhard Breitmaier and Günther Jung. Stuttgart: Georg Thieme Verlag, 2012. http://dx.doi.org/10.1055/b-0034-44080.

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"36.4 Polykondensationen." In Organische Chemie, edited by Eberhard Breitmaier and Günther Jung. Stuttgart: Georg Thieme Verlag, 2009. http://dx.doi.org/10.1055/b-0034-49705.

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4

"γ6) präparative Methoden zur Herstellung von Polykondensaten." In Makromolekulare Stoffe, edited by Herbert Bartl and Jürgen Falbe. Stuttgart: Georg Thieme Verlag, 1987. http://dx.doi.org/10.1055/b-0035-114980.

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