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The first part of the book aims at a careful inspection of the influence of temperature on the microstructure of PNIPA gels synthesized by free radical cross-linking copolymerization, FRC, in the range 10-27.5 °C, i.e. below LCST by means of static and dynamic light scattering methods.Many studies have shown that structures of networks obtained by free radical cross-linking copolymerization generally seem to be inhomogeneous in the q-range 0.1 nm-1. An alternative approach to obtain homogeneous gels is UV induced photo cross-linking polymerization, PC. Cross-links are expected to be introduced randomly in space for photo cross-linked gels.The purpose of the second part of this study is to compare network structures i.e. inhomogeneity, of the free radical cross-linking PNIPA gels (FRC gels) prepared at 25 °C to photo gels (PC gels) synthesized by photo cross-linking polymerization of (N-isopropylacrylamid)-2-(dimethylmaleimido)- N -ethyl-acrylamide, poly(NIPA-co-DMMIAAm) at observation temperatures 25, 20, 15, 10, 30 °C (in that sequence).It is expected that photo gels starting from semi-dilute polymer solution are more homogenous than free radical gels.