Systems in a units or mers these molecules called

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Unformatted text preview: us section, secondary of Describing solid, usually isotropic, both primary and secondary bonds. As mentioned in either the same or a consideration. rtion of matter bounded by a bonds influence the macroscopic material properties only when there is an absence of joined crystals orthan the solvent. different species grains. primary bonds in certain regions of a material. Many of the polymers described in the next ically separate from any other polymer solid solution A bonds. solution of section display propertiesEngineering material composedin which interstitial dominated by secondary solid high–molecular-weight molecules. These molecules atoms or ions of a foreign species are located in the cal representation showing the OF POLYMERhave either a linear (chain) structure or a usually MOLECULES 2.9 THE STRUCTURE interstitial positions. a given composition as a three-dimensional network structure. An important class of conduction intrinsic materials consists of large molecules called macromolecules. A Electrical conduction in pure subset of macromolecules are those that are formed by linking together a large number of semiconductors composites Composite identicalpolymer-matrixsuch as Si, Ge, and GaAs. systems in a units, or mers. These molecules, called polymers, for “many mers,” offer variety ofinvariant matrix material is a contain covalent bonds within the useful the reaction scence that persists more which properties. Although all polymers polymer. there are zero A reaction is which molecules, they may have either primary or secondary bonds bridging the macrous is removed. degrees of freedom. polymorphic Allotropic; capable of more atomic scale molecules. We have elected to introduce the concept of a polymer in thethan one structure chapter since the distinction between the two major subclasses of polymers is crease in electrical crystal structure. A process in which ions of light ion implantation based on the type of bond between adjacent polymer chains. by photostimulation. elements such as boron and nitrogen are As an to impinge The structurally simplest polymers are A process...
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