Flexibility characteristics

Nitrile mbber finds broad application in industry because of its excellent resistance to oil and chemicals, its good flexibility at low temperatures, high abrasion and heat resistance (up to 120°C), and good mechanical properties. Nitrile mbber consists of butadiene—acrylonitrile copolymers with an acrylonitrile content ranging from 15 to 45% (see Elastomers, SYNTHETIC, NITRILE RUBBER). In addition to the traditional applications of nitrile mbber for hoses, gaskets, seals, and oil well equipment, new applications have emerged with the development of nitrile mbber blends with poly(vinyl chloride) (PVC). These blends combine the chemical resistance and low temperature flexibility characteristics of nitrile mbber with the stability and ozone resistance of PVC. This has greatly expanded the use of nitrile mbber in outdoor applications for hoses, belts, and cable jackets, where ozone resistance is necessary. 

Polymers. The manufacture of alcohols fiom higher olefins via the oxo process for use m plasticizers is a significant outlet for both linear a-olefins and branched olefins such as heptenes, nonenes, and dodecenes. These olefins are converted into alcohols containing one more carbon number than the original olefin. The alcohols then react with dibasic anhydrides or adds to form PVC plasticizers. The plasticizers produced from the linear olefins have superior volatility and cold-weallier flexibility characteristics, making them an ideal product to use in flexible PVC for automobile interiors. 

The second independent motion requires a suitable dynamic model that reflects the geometric constraints of chain flexibility characteristic of polysaccharides. However, no model is yet available that takes polysaccharide structural details into account or describes possible modes of reorientation in the carbohydrate chain. 

Polyurethane crack-sealing systems have a low viscosity. They penetrate into fine cracks and cavities. Cured systems have strong but flexible characteristics, to withstand differential structural movement. They also withstand high hydrostatic pressures. 

Scarp tires have retaining strength and flexibility characteristics that make them potentially attractive as a basic construction material. They are relatively small and easy to handle, and their geometric configuration lends itself to a building block approach in constructing larger modules. 

Note that for some properties, such as melting temperature, both the chemical structure and the long chain nature of polymers play important roles. As will be seen later, the stiffness and flexibility characteristics of polymers are largely determined by the degree of hindrance to free rotation about single bonds in the backbone chain. 

In its turn, the characteristic ratio C, which is polymer chain statistical flexibility characteristic [25], is determined according to the Eq. (97) [153] ... 

Two provisions of the standard prohibit the repair of the jacket of a worn or frayed flexible cord with electrical tape. Section 1926.403(a) requires that the cord be approved. The original approval of the cord was based on the types of materials and construction used. As noted above, taping the cord can change the flexibility characteristics of the cord, which in turn can affect the amount of stress in the adj acent areas. This is of particular concern with respect to the grormding wire. 

The possibility of connection between medical equipment allows the appliance of auxiliary tools to complement the function or even to flexibly use different equipment, which can be selected by the professional user according to the necessity. This flexible characteristic aims to achieve adaptations and connections, which are designed in CE to develop the configuration of accessories of the equipment in the IPDP. This configuration requires a standardization of connection... 

Good strength and flexibility characteristics in the boundary film formed between the adhered members by the isocyanate-based adhesives are also considered to be favourable contributions to good adhesion. 

FIGURE 9.22 (a) Schematic diagram of the sandwich structure of a magnetic-field-sensitive drug delivery chip (b) the resulting chip-like device exhibits mechanically flexible characteristics. Reproduced with permission from [169]. Copyright 2009 Elsevier. 

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