Weighted Properties

In the first stage, we obtain a group of materials for a particular application. In the second stage, the size of this group is further cut down. Again, there are a number of methods used for this. We shall consider the method based on weighted properties. 

In this method, each property is given a weight (a) based on its importance in the service of the component. Then, a weighted property value is obtained by multiplying the value of the property of the material by a. At the end, the property values for all the properties required for the application of the material are summed up. This sum gives the performance index for that material. Whichever material has got the highest value will be the most preferred one for that application. 

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The development of the differential equations which describe the evolution of particle size and molecular weight properties during the course of the polymerization is based on the so-called "population balance" approach, a quite general model framework which will be described shortly. Symbols which will be used in the subsections to follow are all defined in the nomenclature. 

Staudinger, the final speaker, presented a broad array of data on polymerization, hydrogenation, comparisons of viscosity, melting points, and solubility of polymers. He pointed out that in the conversion of polystyrene to hexahydropolystyrene, and polyindene into hexahydropolyindene, the products retained their high molecular weight properties. Again, he maintained this proved "the monomers are united by main valencies" (62). 

Analyzing the data obtained when testing the samples of extrusion products made of polypropylene, the conducted research on their molecular-weight properties, and the calculated values of the criterion for the destruction processes rate, we concluded that the processes of attachment and bifurcation correspond to the values of ] = 1, while the processes of destruction correspond to 1 = - 1. 

Thickness and Basis Weight Property Measurements Taken with Membrane Conditioned to 23°C, 50% RH... 

The basic mixture model equation (3.417) contains several undetermined quantities which have to be determined. These variables are conventionally postulated as the sum of the volume fraction weighted property values of the phases in the mixture. 

Since the mixture properties are given as the sum of the volume fraction weighted property values of the different phases in the mixture, the dispersed phase volume fractions were originally calculated from the postulated dispersed phase continuity equations. In the past these macroscopic equations were expressed based on hypothesis and physical intuition rather than basic principles. The modern versions of the classical mixture theories are thus derived starting out from the averaged equations for the individual phases to ensure that the governing equations are correctly formulated. 

The probability-weight properties p and pj are, and should be, primarily independent of the property p that dehnes the second dimension of the descriptor. In other words, the distance dimension g(r) is separated from the property dimension g(p ), and, additionally, the probability is weighted by the property p. Figure 5.17 shows an example of a 2D RDF descriptor calcnlated for a simple molecule. 

The intermediate does not have to be isolated and continuous reaction produces a polymer. The use of flexible triols such as 1,2,6-hexanetriol produces highly flexible polymers that have ointment-like properties even at relatively high molecular weights. Properties such as viscosity and hydrophobicity can be readily varied by controlling molecular weight and the size of the alkyl group R. ... 

When alternative Lewis structures can be written for a molecule and they differ only in the assignment of electrons among the nuclei, with nuclear positions being constant, then the molecule is not completely represented by a single Lewis structure, but has weighted properties of all the alternative Lewis structures. 

The system styrene-acrylonitrile copolymer (SAN) 28% acrylonitrile/ poly (methyl methacrylate) exhibits thermodynamic solubility relationships adequate for studying phase transition phenomena. The molecular weight properties of the polymers used in this study (Table III) were measured by gel permeation chromatography. The cloud-point curve for binary mixtures of these two polymers was determined by a technique developed previously (10). 

The molecular weight properties of both polymers are presented in Table III. Figure 5 is the experimental cloud-point curve. The system was particularly sluggish because of reduced mobility of the components in the lower temperature range, so precision is somewhat diminished. According to the molecular weight distribution statistics and computational results like those shown in Figure 1, the critical point should be shifted approximately 10% up the... 

Thickness and basis weight properties Membrane type NR-111 NR-112... 

Forgings A number of alloys forge very well - a process originally developed for aircraft components where high-strength and low-weight properties were required. 

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