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Molecule chain-length distribution

Wj. weight chain length distribution of the primary molecules,... [Pg.254]

The behaviour of chain-length distribution is non-characteristic during thermal-oxidative degradation of isotropic PP films the degradation shifts towards decrease in molecular mass, while during oxidation in deformed films it shifts towards increase in molecular mass. It means that with oxidation in isotropic samples in the induction period the destruction of molecules prevails. On the other hand, with oxidation in deformed samples attachement and cross-linking dominate. [Pg.185]

In the solid state the translational motion of the molecules is slow and the molecules are arranged with long-range orientational and positional order. However, for compounds with long hydrocarbon chains the molecules may rotate in their lattice sites at the same time as they maintain full positional order, forming so-called plastic crystals (Evans and Wennerstrom, 1994, p. 412). The stability of these plastic crystalline phases (cy-forms) increases with chain length and with the presence of impurities (e.g., broad chain-length distributions) (Larsson, 1994, p. 27). [Pg.34]

Compartmentalization of radicals into polymer particles may yield a unique MWD for the linear chains, as discussed in Sect. 3.1, except when the dominant chain termination mode is the chain transfer reaction. Branched polymer molecules are assemblies of linear polymer chains (called primary chains), and compartmentalization effects on the primary chain length distribution must be properly accounted for. [Pg.95]

Histograms from stepwise straining tests, reflecting as they do the (apparent) length distribution of breakable molecules, are more informative than most other means of displaying ESR data. For example, Hassell has obtained an interesting correlation between the width of the apparent chain length distribution and the... [Pg.35]

The chain length distribution is usually presented as a plot of the mole fraction or weight average of molecules versus molecular weight. The various average molecular weights represent the moments of the chain length distribution... [Pg.122]

As the reaction proceeds to a fractional conversion of p for either functional group A or B, the reaction mixture contains polymer molecules with a variety of chain lengths. Thus, the modeling objective here is to quantify the development of polymer chain length distribution (CLD) at different end-group conversions. [Pg.280]

Complete knowledge of the chain length distribution is available if, Pj, the fraction of (or probability of having formed) polymer molecules containing j monomer residues, is known. If p is the a priori probability that a single addition of monomer to the growing chain is made, then it is quite clear that a... [Pg.109]

It can be shown that the sum of these four, minus those molecules containing no AA units, is exactly 1/2 the total number of ends, as is required. Therefore, the normalized (Z Pj=l) chain-length distribution with j AA units is ... [Pg.112]

The structures of some common nonionic surfactants are shown in Figure 3.2. Ethoxylated alcohols are produced from the reaction of fatty alcohols with ethylene oxide, which results in a broad distribution in the number of EO units per molecules. These surfactants are generally excellent detergents, very mild, and less sensitive to water hardness ions, and also act as solubilizers. A typical ethoxylated alcohol used in LDLDs has approximately 9 EO units and a carbon chain length distribution centered around Cll. [Pg.44]


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See also in sourсe #XX -- [ Pg.381 ]




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