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active center
Location of the unpaired electron on a free radical where reactions take place. (See section on polymer synthesis)
alignment layer
A layer and/or surface treatment applied to the boundary of a liquid crystal cell to induce a particular director orientation. For example, a layer of polyimid buffed in one direction induces alignment parallel to the buffing direction, or a surfactant may be polymerized on a boundary surface to induce perpendicular alignment.
amorphous
Irregular; having no discernible order or shape. In the context of solids, the molecules are randomly arranged, as in glass, rather than periodically arranged, as in a crystalline material.
amorphous polymers
A glass-like structure with tangled chains and no long-range order. (See Polymer Morphology section) |