{"id":{"repo_id":"bayreuth","oai_identifier":"oai:epub.uni-bayreuth.de:680"},"canonical_url":"https://search.dev.ndltd.org/etd/bayreuth/oai:epub.uni-bayreuth.de:680","repository":{"repo_id":"bayreuth","name":"Universität Bayreuth","base_url":"https://epub.uni-bayreuth.de/cgi/oai2"},"display":{"title":"Orientation and Phase Behavior of Block Copolymers in External Electric Fields","abstract":"The influence of external electric fields on the microdomain structure of block copolymers has been studied. The results range from an analysis of the mechanism and kinetics of the reorientation process, via the discussion of the driving force, to first investigations on the influence of an electric field on the phase behavior. The electric field induced effects on concentrated block copolymer solutions were investigated by in-situ synchrotron small-angle x-ray scattering. The first part concerns the analysis of the mechanism and kinetics of the alignment of lamellar forming diblock copolymer solutions as well as a quantitative study of the reorientation kinetics of various block copolymers in order to clarify the driving force of reorientation in a DC electric field. The second part of this thesis describes the influence of an electric field on the phase behavior of block copolymers. It is shown that a gyroid phase (G) as well as a hexagonally perforated lamella phase (HPL) exposed to an electric field undergo a phase transition to cylinders (C) and lamellae (L), respectively. Furthermore, an anisotropic deformation of the chain conformation in various lamellar and cylindrical block copolymer solutions via electric fields is demonstrated.","abstract_html":"The influence of external electric fields on the microdomain structure of block copolymers has been studied. The results range from an analysis of the mechanism and kinetics of the reorientation process, via the discussion of the driving force, to first investigations on the influence of an electric field on the phase behavior. The electric field induced effects on concentrated block copolymer solutions were investigated by in-situ synchrotron small-angle x-ray scattering. The first part concerns the analysis of the mechanism and kinetics of the alignment of lamellar forming diblock copolymer solutions as well as a quantitative study of the reorientation kinetics of various block copolymers in order to clarify the driving force of reorientation in a DC electric field. The second part of this thesis describes the influence of an electric field on the phase behavior of block copolymers. It is shown that a gyroid phase (G) as well as a hexagonally perforated lamella phase (HPL) exposed to an electric field undergo a phase transition to cylinders (C) and lamellae (L), respectively. Furthermore, an anisotropic deformation of the chain conformation in various lamellar and cylindrical block copolymer solutions via electric fields is demonstrated.","abstract_has_math":false,"creators":["Schmidt, Kristin"],"institution":"Universität Bayreuth","degree_name":null,"degree_level":"thesis.doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":["Böker, Alexander"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2007,"date_issued":"2007-11-14","date_published":"2007-11-14","updated_at":"2026-07-27T18:49:23Z","subjects":[],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://epub.uni-bayreuth.de/id/eprint/680/","outbound_label":"Repository record","outbound_source":"source_url"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Böker, Alexander"]},{"key":"dc:creator","label":"Author","values":["Schmidt, Kristin"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:publisher","label":"Institution","values":["Universität Bayreuth"]},{"key":"dc:type","label":"Dc Type","values":["doctoralThesis"]},{"key":"thesis:degree_level","label":"Degree Level","values":["thesis.doctoral"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Universität Bayreuth"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The influence of external electric fields on the microdomain structure of block copolymers has been studied. The results range from an analysis of the mechanism and kinetics of the reorientation process, via the discussion of the driving force, to first investigations on the influence of an electric field on the phase behavior. The electric field induced effects on concentrated block copolymer solutions were investigated by in-situ synchrotron small-angle x-ray scattering. The first part concerns the analysis of the mechanism and kinetics of the alignment of lamellar forming diblock copolymer solutions as well as a quantitative study of the reorientation kinetics of various block copolymers in order to clarify the driving force of reorientation in a DC electric field. The second part of this thesis describes the influence of an electric field on the phase behavior of block copolymers. It is shown that a gyroid phase (G) as well as a hexagonally perforated lamella phase (HPL) exposed to an electric field undergo a phase transition to cylinders (C) and lamellae (L), respectively. Furthermore, an anisotropic deformation of the chain conformation in various lamellar and cylindrical block copolymer solutions via electric fields is demonstrated.","In der vorliegenden Arbeit wurde der Einfluss von äußeren elektrischen Feldern auf die Mikrodomänenstruktur von Blockcopolymeren untersucht. Die Resultate reichen von einer Analyse der Mechanismen und Kinetik des Reorientierungsprozesses, über eine Diskussion der treibenden Kraft für diesen Prozess, bis hin zu ersten Untersuchungen des Einflusses eines elektrischen Feldes auf das Phasenverhalten von Blockcopolymeren. Die durch das elektrische Feld hervorgerufenen Effekte auf konzentrierte Blockcopolymerlösungen wurden mittels in-situ Röntgenkleinwinkelstreuung (SAXS) untersucht. Im ersten Teil dieser Arbeit wurden die Mechanismen und die Kinetik der Reorientierung von Diblockcopolymeren unterschiedlicher Zusammensetzung in Lösung analysiert, um die treibende Kraft dieses Prozesses aufzuklären. Der zweite Teil dieser Arbeit beschreibt den Einfluss eines elektrischen Feldes auf das Phasenverhalten von Blockcopolymeren. Es konnte gezeigt werden, dass sowohl die Gyroid-Phase (G) als auch die hexagonal perforierte lamellare Phase (HPL) einer Phasenumwandlung zu Zylindern (C) bzw. Lamellen (L) unter dem Einfluss eines elektrischen Feldes unterliegen. Weiterhin wurde eine durch elektrische Felder hervorgerufene anisotrope Deformation der Kettenkonformation in verschiedenen lamellaren und zylindrischen Blockcopolymerlösungen gefunden."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Orientation and Phase Behavior of Block Copolymers in External Electric Fields"]}]}],"canonical_facts":{"dc:contributor":["Böker, Alexander"],"dc:creator":["Schmidt, Kristin"],"dc:description.abstract":["The influence of external electric fields on the microdomain structure of block copolymers has been studied. The results range from an analysis of the mechanism and kinetics of the reorientation process, via the discussion of the driving force, to first investigations on the influence of an electric field on the phase behavior. The electric field induced effects on concentrated block copolymer solutions were investigated by in-situ synchrotron small-angle x-ray scattering. The first part concerns the analysis of the mechanism and kinetics of the alignment of lamellar forming diblock copolymer solutions as well as a quantitative study of the reorientation kinetics of various block copolymers in order to clarify the driving force of reorientation in a DC electric field. The second part of this thesis describes the influence of an electric field on the phase behavior of block copolymers. It is shown that a gyroid phase (G) as well as a hexagonally perforated lamella phase (HPL) exposed to an electric field undergo a phase transition to cylinders (C) and lamellae (L), respectively. Furthermore, an anisotropic deformation of the chain conformation in various lamellar and cylindrical block copolymer solutions via electric fields is demonstrated.","In der vorliegenden Arbeit wurde der Einfluss von äußeren elektrischen Feldern auf die Mikrodomänenstruktur von Blockcopolymeren untersucht. Die Resultate reichen von einer Analyse der Mechanismen und Kinetik des Reorientierungsprozesses, über eine Diskussion der treibenden Kraft für diesen Prozess, bis hin zu ersten Untersuchungen des Einflusses eines elektrischen Feldes auf das Phasenverhalten von Blockcopolymeren. Die durch das elektrische Feld hervorgerufenen Effekte auf konzentrierte Blockcopolymerlösungen wurden mittels in-situ Röntgenkleinwinkelstreuung (SAXS) untersucht. Im ersten Teil dieser Arbeit wurden die Mechanismen und die Kinetik der Reorientierung von Diblockcopolymeren unterschiedlicher Zusammensetzung in Lösung analysiert, um die treibende Kraft dieses Prozesses aufzuklären. Der zweite Teil dieser Arbeit beschreibt den Einfluss eines elektrischen Feldes auf das Phasenverhalten von Blockcopolymeren. Es konnte gezeigt werden, dass sowohl die Gyroid-Phase (G) als auch die hexagonal perforierte lamellare Phase (HPL) einer Phasenumwandlung zu Zylindern (C) bzw. Lamellen (L) unter dem Einfluss eines elektrischen Feldes unterliegen. Weiterhin wurde eine durch elektrische Felder hervorgerufene anisotrope Deformation der Kettenkonformation in verschiedenen lamellaren und zylindrischen Blockcopolymerlösungen gefunden."],"dc:format.medium":["application/pdf"],"dc:publisher":["Universität Bayreuth"],"dc:title":["Orientation and Phase Behavior of Block Copolymers in External Electric Fields"],"dc:type":["doctoralThesis"],"thesis:degree_level":["thesis.doctoral"],"thesis:institution_name":["Universität Bayreuth"]},"updated_at":"2026-07-27T18:49:23Z"}