Model Neoprene

The results of searches of these two chemical classes matched by polymer are presented in Table II. Three candidate polymers (natural rubber, neoprene, and nitrile) were found with 15 models giving acceptable test data. 

The model provides a complete constitutive equation for NBR and Neoprene and is internally consistent with damping factor data. 

The most common low pressure reactor is the Parr hydrogenator shown in Fig. 6.5. This system is composed of a reaction bottle that is coimected to a gas reservoir that has a capacity of about four liters. Two versions of the apparatus are commercially available a standard model that takes 250 mL and 500 mL reaction bottles and that can be used to pressures up to about 60 psig and a larger size that uses 1 liter and 2 liter bottles that have about a 40 psig pressure limit. The bottles are coimected to the gas reservoir by a tube inserted through a rubber stopper in the mouth of the bottle. The common black rubber stoppers may contain catalyst poisons that can be extracted into the reaction mixture by some solvents. The use of neoprene stoppers will minimize this problem. 

Fig. 6.7 A comparison of the nominal stress, t, vs. the stretch response of neoprene in uniaxial compression and plane-strain compression at T = 293 K of the eight-chain model and data from experiments (from Arruda and Boyce (1993) courtesy of Elsevier).

The investigations described in this paper concern the pressure measuring under textile bands placed on a model representing selected parts of a human body with pre-set circumferences. For this purpose, rigid cylinders were prepared, covered by a layer of neoprene which simulated the susceptibility of human sl. ... 

Arruda and Boyce [12] showed that the eight-chain model performed much better than three- and four-chain models in predicting the behaviour of vulcanized rubber in uniaxial and biaxial tension and shear, and also performed excellently in modelling uniaxial and plane strain compression of gum and neoprene rubber. 

Static wick test results on a wickproof steel cord reinforced neoprene rubber fabric for sonar dome rubber windows (SDRWs) on US navy vessels are presented. A dynamic water wicking test was developed to model actual operating conditions of the SDRWs. All fabric samples believed to be wickproof failed this test. The effects of mechanical flexure on other mechanical properties of steel reinforced rubber fabric are discussed. 11 refs. 

The face of the basic Class I unit can be adapted for different operations. A panel containing arm ports can be fitted to some models, and certain of these can be provided with arm-length neoprene gloves (see Figure 9.4). This latter adaptation converts the cabinet into a glove box, but it does not make the Class I cabinet into a Class III unit. These adaptations will, however, reduce the chance of product contamination while increasing operator protection. 

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