Silicone networks high junction

Equilibrium Tensile Behavior of Model Silicone Networks of High Junction Functionality... 

Figure 2. (A) Growth curve for pristine sample showing results of one site fit (dotted line) and two site fit (solid line - components are shown underneath curve in red) (B) Schematic of network structure of typical engineering silicone with both short and long chain constituents and standard four site crosslinking species and highly junctional crosslinking sites. (Figure 2B is reproducedfrom reference 17. Copyright 2005 American Chemical Society.) (See page 7 of color insert.)...

As in carbon-black-filled EPDM and NR rubbers, the physical network in silica-filled PDMS has a bimodal structure [61]. A loosely bound PDMS fraction has a high density of adsorption junctions and topological constraints. Extractable or free rubber does virtually not interact with the silica particles. It was found that the density of adsorption junctions and the strength of the adsorption interaction, which depends largely on the temperature and the type of silica surface, largely determine the modulus of elasticity and ultimate stress-strain properties of filled silicon rubbers [113]. 

Obviously, the performance of organic cells having bicontinuous network structures with quantum efficiencies of about 50% and power conversion efficiencies of about 5% remains far inferior to that of silicon cells, but is highly improved as compared to that of flat-junction organic cells, which have both quantum efficiencies and power conversion efficiencies of less than 0.1%. 

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