The (photo)physical properties of polymers are predominantly attributed to their intermolecular and intramolecular interactions. In conjugated polymers, charges or excitons can transport either along the conjugated backbone or intermolecularly via π-stacking interactions. Yet, our understanding of what each type of interaction contributes, is still rather limited. Moreover, independently studying the effects of either inter or intramolecular interactions is often not possible in traditional conjugated polymers or materials. Therefore, it is important to develop new materials or polymers, in which there is control over these interactions, and which in turn can afford desirable properties or improved device performance. Encapsulated conjugated materials are an attractive class of materials that could potentially improve our fundamental understanding in these areas. In this thesis, we will therefore discuss how molecular encapsulation influences interactions within or between polymer chains/materials as well as their (photo)physical properties, and/or device performance.