Principal-Agent Interactions

Silane coupling agents interact with receptive inorganic surfaces forming tenacious bonds at the interface. These receptive inorganic surfaces are characterized by the presence of hydroxyl groups (OH) bonded principally to silicon and aluminum. 

Taylor [ 160] further speculated that there may exist very small scale eddies which, though they play a very small part of diffusion, yet may be principal agents in the dissipation of energy. Unfortunately, the simplified engineering method doesn t provide much information about the structure of turbulence and the dynamics of the interactions between the turbulent vortexes. The only structural information extracted from the second moments in relation to the structure of turbulence is the length scale, A, and the only information in relation to the dynamics of mrbulence is the time constant representing the eddy turnover time, Tg ... 

The management at the Principal organization developed three strands in their SCRM response to the key risk sources and drivers perceived and evaluated. All three strands involved developing a much closer relationship with all 40 distributors, involving changes to the stractures, processes, systems and interactions that governed their principal-agent relationship at that time. These three initiatives comprised ... 

Release agents function by either lessening intermolecular interactions between the two surfaces in contact or preventing such close contact. Thus, they can be low surface-tension materials based on aUphatic hydrocarbon, fluorocarbon groups, or particulate soHds. The principal categories of material used are waxes, fatty acid metal soaps, other long-chain alkyl derivatives, polymers, and fluorinated compounds. 

Cross-linked finishes are not permanent in the tme sense of the word however, under optimum conditions the finish can last for the usehil life of the material. Wet abrasion during laundering is probably the principal cause of gradual removal of the finish. In order to retain antistatic protection for extended use, an excess of finish is often appHed The extent of chemical interaction between the durable antistatic agents and the fiber substrates to which they are appHed is not perfectiy understood. Certain oxidizing agents such as hypochlorite bleaches tend to depolymerize and remove some durable antistatic finishes. Some of the durable finishes have also produced undesirable side effects on textile materials, ie, harsh hand, discoloration, and loss of tensile properties. 

H NMR transverse magnetisation relaxation experiments have been used to characterise the interactions between NR, isoprene rubber, BR, EPDM and polyethylacrylate rubbers with hydrophilic silica and silicas modified with coupling agents [124-129]. These studies showed that the physical interactions and the structures of the physical networks in rubbers filled with carbon black and rubbers filled with silicas are very similar. In both cases the principal mechanism behind the formation of the bound rubber is physical adsorption of rubber molecules onto the filler surface. 

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