PVCL and PNIPMAAm core–shellcomponents in microgel particles are shown to have different volumephase temperature transition behavior than the respective homopolymermicrogel particles due to confinement effects. A combination of dynamiclight scattering (DLS) data that gives access to the temperature dependenceof hydrodynamic radius and modified Flory–Rehner theory inthe presence of networks confinement allowed obtaining informationabout correlated morphological changes of components inside of core–shellmicrogels. The core–shell components individual temperaturebehavior is analyzed by modifying the Flory–Rehner transitiontheory in order to account for core–shell morphology and theexistence of an interaction force between core and shell. Describingthe dependence on temperature of the radial scale parameter, the ratiobetween the radius of the core and the hydrodynamic radius, we gainaccess to the swelling behavior of the core and shell components irrespectiveof the swelling behavior of the total hydrodynamic radius. Furthermore,the theoretical description of volume phase temperature transitionpermits the development of scenarios for the correlated changes inthe core and shell radial dimensions for the two microgels with reversedmorphologies. The fact that the theoretical model is appropriate forthe treatment of core–shell microgels is proved a posterioriby obtaining a temperature dependence of the components that isin accordance with the expected physical behavior. Novel core–shellmicrogel systems of PVCL (poly(N-vinylcaprolactam))-core/PNIPMAAm(poly(N-isopropylmethacrylamide))-shell and PNIPMAAm-core/PVCL-shell,with a double volume phase temperature transition due to the thermoresponsivecomponents, were used for this study. [ABSTRACT FROM AUTHOR]