Self-organized structures are formed in water by electrostatic attraction between two oppositely charged poly(N-isopropylacrylamide) PNIPAAM diblock copolymers, which are mixed at 1:1 charge ratio. The copolymers have the same lengths of the PNIPAAM and the charged blocks. We use dynamic and static light scattering, turbidimetry, small angle X-ray scattering, 2D- or NOESY-nuclear magnetic resonance, cryo-transmission electron microscopy, electrophoretic mobility and DSC measurements to investigate the effect of temperature and total concentration on the aggregation behavior.