Single-phase mechanism

Reaction uniqueness. The structure of the monomer lattice must uniquely determine which monomer molecules will react, and in what fashion. Further, symmetry elements of the monomer lattice must be preserved for molecular subunits of the polymer. If this is not the case, local disorder can result. This criterion severely limits the number of monomer crystal structures which can be expected to polymerize via single-phase mechanisms. External forces of some kind which reduce the symmetry of the monomer lattice can be used to help meet the uniqueness criterion. 

Ferroelectric Ceramic—Polymer Composites. The motivation for the development of composite ferroelectric materials arose from the need for a combination of desirable properties that often caimot be obtained in single-phase materials. For example, in an electromechanical transducer, the piezoelectric sensitivity might be maximized and the density minimized to obtain a good acoustic matching with water, and the transducer made mechanically flexible to conform to a curved surface (see COMPOSITE MATERIALS, CERAMiC-MATRix). 

Figure 12.12 Tripping mechanism of an overcurrent-cum-single-phasing thermal relay...

These can be adjusted by varying the contact traverse. The mechanism s design is such that an increase or a difference in the line currents, due to voltage unbalance or single phasing, drives the mechanism towards the tripping lever. These relays operate at 100% of their setting and are therefore set at... 

It is necessary to consider the micro-mechanical processes of polymer glasses and elastomers separately as their mechanical properties are so different. In addition, cross-linking profoundly affects the deformation processes in glasses but very little is known about the micro-mechanical processe.s that occur in single phase cross-linked glasses so the latter materials will not be discussed further. 

Since these double-base proplnts consist essentially of a single phase which bears the total load in any application of force, their mechanical property behavior is significantly different from composite proplnts. In the latter formulations, the hydrocarbon binder comprises only about 14% of the composite structure, the remainder being solid particles. Under stress, the binder of these proplnts bears a proportionately higher load than that in the single phase double-base proplnts. At small strain levels, these proplnts behave in a linear viscoelastic manner where the solids reinforce the binder. As strain increases, the bond between the oxidizer and binder breaks down... 

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