Materials with a controlled response on external stimuli are very attractive for research and applications. For our research temperature is in focus as an external stimulus. Thermo-responsive block-polymers were synthesised via RAFT polymerization. Starting from a structure motive with a dodecyl (C$_{12}$)-chain as hydrophobic tail, a permanent hydrophilic block consisting of N-dimethylacrylamide (DMA) and a thiocarbonate based residual. For temperature response a second block is added based on a monomer with a lower critical solution temperature (LCST) like -isopropylacrylamide (NiPAm). The droplet microemulsion (ME) is prepared out of -tetradecyldimethylamine oxid (TDMAO) and an oil like n-decane in water. Our studies focus on the structural investigation of the thermo-responsive block-polymer in water with respect to structural changes with increasing temperature. Light and small-angle neutron scattering (SANS) were performed for insights into structural arrangements of polymer and polymer-microemulsion aggregates in water.