Characterisation of Block Copolymers by On-line HPLC-NMR Vom Fachbereich Chemie der Technischen Universität Darmstadt zur Erlangung des akademischen Grades eines Doctor rerum naturalium (Dr. rer. nat.) genehmigte Dissertation vorgelegt von Pritish Sinha (M.Sc.) Aus Kalkutta, Indien Berichterstatter: Prof. Dr. H. Pasch Mitberichterstatter: PD. Dr. R. Meusinger Tag der Einreichung: 14.05.2009 Tag der mündlichen Prüfung: 29.06.2009 Darmstadt 2009 D 17 Acknowledgement I wish to extend my deepest appreciation to my research adviser, Prof. Dr. Harald Pasch who believed in my abilities as a graduate student and gave me the opportunity to work in his research group. I am also thankful to him for providing me a challenging research topic and for the liberty I had for performing the research work. I would like to thank Dr. Wolf Hiller who introduced me to the field of nuclear magnetic resonance spectroscopy as well as the coupling of HPLC-NMR. His constant guidance and encouragement has proved invaluable in my research activities. I also appreciate him for his moral support, compliments and optimistic discussions. I would like to express my gratitude to all my former and present colleagues of DKI who morally supported me during my stay in the institute as well as for a pleasant working atmosphere. Moreover, I would like to appreciate all my friends who made my stay in Germany a pleasant one.