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One of the fundamental requirements in polymer chemistry today is the control of functionality and functionality placement on various size scales ranging from individual polymer chains to micellar aggregates to self-organised phases in the solid state. The three research projects (subproject A, B, C) described below address different aspects of this requirement, dealing with the placement of functional polymer end-groups in the first two projects and control over the self assembled solid state phases via post polymerisation functionalisation of block copolymers in the third.The first research project deals with the development of methods for introducing end-groups for living olefin metathesis polymers. Since the recent development of very stable and functional group tolerant ruthenium carbene complexes by Grubbs et al., the ring opening metathesis polymerisation (ROMP) has received increased attention. Several techniques for introducing end groups to olefin metathesis polymers via acyclic diene metathesis (ADMET) or ROMP using chain transfer agents have been reported. However, these methods typically give broader molecular weight distributions and carry two functional groups, one at either chain end. The ring opening metathesis polymerization (ROMP) using chain transfer agents is not a living polymerization technique and hence gives less control over the molecular weight distribution and at best homo-telechelic polymers carrying two identical chain-end groups.One major drawback of the living metathesis polymerisation technique, i.e. in the absence of chain transfer, compared to most others was, that it didn‘t offer a straightforward synthetic method for introducing functional end-groups. We recently developed several ways to overcome this limitation and hydroxyl, thiol, aldehyde and carboxylic acid groups are now readily available as living ROMP end-groups. In this proposal we focus on the introduction of amine or protected amine end-groups via the so-called Sacrificial Synthesis. This technique makes use of cyclic olefins that can later on be cleaved to yield the required functionality at the polymer chain end. Amines are very useful nucleophiles that can readily be further functionalised by reductive alkylation or amide formation. More complex polymeric architectures or polymer conjugates with functional molecules, oligomers or biomolecules are thus readily accessible.Secondly, the synthesis of a universal end-capping reagent is proposed based on functionally substituted vinyl esters or vinyl halides. Very recent reports indicate that such compounds are likely to act as living ROMP terminating agents and can easily be synthesised and derivatised. As they carry a readily functionalisable group in addition to a group that forms a non-metathesis active carbene, such compounds will be particularly useful for the attachment to macroscopic surfaces, nanoparticles or functional solid supports. Solid surfaces derivatised in this way will readily react with the polymeric ruthenium carbene such that the polymer block will be transferred onto the surface. In the case of solid supports, the result will be a polymer conjugate with a sequence-controlled oligomer prepared on the solid support, for example a peptide.Making use of this functional group tolerance, we propose a third project dealing with the synthesis of post-polymerization functionalisable di- and multiblock copolymers via ROMP. The block copolymers will undergo a microphase separation adopting different solid-state phases depending on the volume fraction of the individual polymer blocks. At least one of the blocks will, however, carry functionalities that allow a post polymerisation volume fraction alteration and hence the possibility to change the position within the solid-state phase diagram. This will be particularly useful for targeting „difficult phases“ such as the gyroid phase, a bicontinuous phase of two interpenetrating polymer blocks, which takes up only a small area in the phase diagram. Additionally, this approach can be of great use in the examination of polymer phase diagrams as one functionalisable block copolymer can be used to sample a range of positions within the solid-state phase diagram by altering the volume fraction of one or more blocks after the polymerisation.