Hybrid SAR302503 datasheet network MDI/SS Hybrid organic-inorganic network MDI/SS was formed in reactions of high-molecular-weight macrodiisocyanate with two end-functional NCO groups and sodium silicate. This network with low reactivity R of organic component and glass transition temperature click here near −50°C (Figure 7) is characterized by high molecular mobility (Figure 7a), elasticity
(Figure 7b), number and mobility of charge carriers (Figure 7c,d) and, correspondingly, relatively high values of permittivity and conductivity. Long organic chains are connected to mineral phase with two end-functional groups (Figure 7e); thus, a weakly cross-linked structure is formed that has bulk adsorbed water. Figure 7 Spectra and structural model of hybrid network MDI/SS in OIS. DSC (a), DMTA (b) and DRS (c, d) spectra and structural model (e) of the hybrid network MDI/SS in OIS with R = 0.06. Hybrid network
PIC/SS Hybrid organic-inorganic network PIC/SS was obtained in reactions of low-molecular-weight isocyanate-containing modifier poly(isocyanate) with R = 0.32 and sodium silicate. This hybrid check details network is rigid (Figure 8b) with glass transition temperature near 70°C (Figure 8a). The structure of this hybrid network is highly cross-linked with low molecular mobility (Figure 8e), due to the short length of organic chains and high reactivity of organic component. Short organic chains with R = 0.32 create continuous layer on the surface of mineral phase. The permittivity and conductivity are low (Figure 8c,d) because of the impossibility of charge transport through such highly cross-linked structure. Figure 8 Spectra and structural model of hybrid network PIC/SS. DSC (a), DMTA (b) and DRS (c, d) frequency spectra and structural model (e) of hybrid network PIC/SS in OIS with R = 0.22. Conclusions Hybrid organic-inorganic polymer nanosystems (OIS) were obtained in reactions of the organic component that was a mixture of two products: macrodiisocyanate (MDI) and isocyanate-containing modifier poly(isocyanate) (PIC) with inorganic component, namely, water solution
of sodium silicate (SS) that exists in a form of oligomer. Changing the reactivity of the organic component from R = 0.04 (pure MDI) to R = 0.32 (pure PIC), the else structure and properties of OIS were varied. The structure of OIS existed in a form of hybrids with covalently connected building blocks and interpenetrating networks, namely, the lowly cross-linked network as a result of reactions of high-molecular-weight MDI with SS and highly cross-linked network that was created in the reactions of low-molecular-weight PIC with SS. Depending on the MDI/PIC ratio, one of the networks was prevailing and created continuous structure with domains of the second network. The properties of the two types of hybrid networks were strongly different. The general properties of OIS were prevalently defined by the properties of the dominant hybrid network.