Orientation thermal characteristic

Orientation, thermal characteristic These oriented plastics are considered permanent, heat stable materials. However, the stretching decreases dimensional stability at higher temperatures. This situation is not a problem since these type materials are not exposed to the higher temperatures in service. For the... 

Copper Cl 94 (taped and gold flash), wire bonded Near CSP format, excellent electrical and thermal characteristics MicroLeadFrame (MLF) and Quad Flat-Pack No-Lead (QFN) (Orient Semiconductor Electronics USA) Microwave, RF, and hand-held portable communications... 

The theory of cold-drawing of synthetic fibres has been reviewed together with the mechanical, general physical, and thermal characteristics of polyester fibres. Drawing, fibrous structure, and fibrillation,and the influence of orientation on crystallinity and birefringence have also been studied and a model proposed for orientational strengthening in 2GT. ... 

A summary of physical and chemical constants for beryUium is compUed ia Table 1 (3—7). One of the more important characteristics of beryUium is its pronounced anisotropy resulting from the close-packed hexagonal crystal stmcture. This factor must be considered for any property that is known or suspected to be stmcture sensitive. As an example, the thermal expansion coefficient at 273 K of siagle-crystal beryUium was measured (8) as 10.6 x 10 paraUel to the i -axis and 7.7 x 10 paraUel to the i -axis. The actual expansion of polycrystalline metal then becomes a function of the degree of preferred orientation present and the direction of measurement ia wrought beryUium. 

Liquid crystal polymers (LCP) are polymers that exhibit liquid crystal characteristics either in solution (lyotropic liquid crystal) or in the melt (thermotropic liquid crystal) [Ballauf, 1989 Finkelmann, 1987 Morgan et al., 1987]. We need to define the liquid crystal state before proceeding. Crystalline solids have three-dimensional, long-range ordering of molecules. The molecules are said to be ordered or oriented with respect to their centers of mass and their molecular axes. The physical properties (e.g., refractive index, electrical conductivity, coefficient of thermal expansion) of a wide variety of crystalline substances vary in different directions. Such substances are referred to as anisotropic substances. Substances that have the same properties in all directions are referred to as isotropic substances. For example, liquids that possess no long-range molecular order in any dimension are described as isotropic. 

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