Polymer flexible network

If R can react with itself or additional components (R contains vinyl, methacryl or epoxy groups, for example), the result of the condensation process is a flexible network of inorganic oxide covalently bonded to organic polymers, namely a hybrid nanocomposite lacking interface imperfections. The properties of this hybrid nanocomposite are intermediate between those of polymers and glasses, and can meet unique requirements. 

According to Table 7.7 the estimated pore volume, IV, of hypercrosshnked polymers prepared from linear polystyrene is rather small. It increases with the degree of crosslinking, but does not exceed 0.5cm /g for rigid networks crosslinked with MCDE to 100%. For somewhat more flexible networks crossHnked with bis-chloromethylated diphenyl to the same extent, the value of the estimated pore volume is even smaller, 0.37cm /g. 

Chen, Z., To, J.W.F., Wang, C., Lu, Z.D., Liu, N., Chortos, A., Pan, L.J., Wei, E, Cui, Y., Bao, Z.N., 2014c. A Three-dimensionally interconnected carbon nano tube-conducting polymer hydrogel network for high-performance flexible battery electrodes. Adv. Energy Mater. 4,1400207. 

Furthermore, BC/SiO NPs aerogels (4-9 wt%) prepared by freeze drying and showing a polymer interpenetrating network microstructure of BC and silica, (Figure 2.24), presented density, specific surface area and low thermal conductivity values (2 x 10 g.cm 734 m. g 3.1 x 10 W.mfK S respectively) comparable to those of pure silica aerogels, and are simultaneously more flexible due to the presence of micro-cracks left by freeze drying [246]. 

Fig. 8.7 Flexible liquid crystal device containing polymer fiber networks top, structure bottom, photograph)...

H. Fujikake, T. Murashige, J. Yonai, H. Sato, Y. Tsuchiya, H. Kikuchi, Y. lino, M. Kawakita, K. Taklzawa, Flexible ferroelectric liquid crystal devices with polymer fiber network supporting plastic substrates. Proc. Int. Display Res. Conf. 3.3, 68-71 (2000)... 

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