The network structure of alkoxysilane as suitable restoration agent of the brittle walls of a cultural heritage site located underground in a desert area in Egypt was investigated using 1H pulsed nuclear magnetic resonance （pulse NMR）. It should possess both high coagulation strength and ductility to ensure that it can withstand an earthquake; it should also contain ethoxy rather than methoxy groups, which generate toxic methanol. The solidification rate for the alkoxysilane oligomer with ethoxy groups was lower than those with methoxy groups; however, the final polycondensates showed the same relaxation time （hardness）. To obtain the network structure combined higher strength and ductility, the alkoxysilane oligomer was mixed with small quantity of di-alkoxy type molecules. The difference spectrum measured by the pulse NMR was developed newly to analyze such network structure. The distribution of crosslinking degree of such polycondensates was narrow, and the amount of lower crosslinking degree was small. On the other hand, the distribution was wide in the polycondensates with ductility but lower strength. The pulse NMR experiment was useful for estimating the solidification rate and the network structure.

Fluorinated polymers such as polytetrafluoroethylene（Teflon®）are indispensable materials in our daily lives because of their high chemical stability, high water repellency, low dielectric constant, and other properties that are irreplaceable. However, due to their special properties, they also have problems such as low solubility in solvents, poor moldability, low adhesiveness, and difficulty in introducing functional groups. Therefore, partially fluorinated polymers are long awaited in order to give them the desired properties while maintaining the good qualities of fluoropolymers as much as possible. On the other hand, visible light induced reactions have been studied explosively in recent years, and organocatalytic fluoroalkylation reactions, which do not use rare metals, have been reported. In this paper, we introduce a recent synthesis of partially fluorinated polymers using a metal-free visible light reaction. First, we introduce the controlled polymerization of polymers with fluoroalkyl groups in the side or main chain by RAFT polymerization. Next, the synthesis of fluoroalkyl-alkyl alternating polymers using the atom transfer reaction of perfluoroalkyl diiodide is described. Finally, the post-reaction introduction of fluoroalkyl groups into aromatic polymers by visible light reaction is presented.