Eicosane region

Model Compounds. Many of the complexities associated with practical polymers and the many simultaneous reaction pathways can be avoided by using model compounds. A typical one is eicosane (n-C20Hi 2) which forms single crystals similar to those in the crystalline regions of polyethylene (58-60). More work is needed on similar compounds and on low molecular weight oligomers to establish both the species produced and the kinetics of their reactions (61,62). 

A high probability for finding two radicals close together would also be expected in regions of high ionization density. Evidence for this effect being operative has been found from studies of the LET effect on radical pair formation in eicosane. ... 

A transition of metastable immiscibility region into a stable equilibria was established in the system ethylene (C2H4) - propane (C3H8) - eicosane (C20H42) (Gregorowicz et al., 1993), where the binary subsystem ethylene (C2H4)... 

Neither the n-eicosane nor the paraffin wax used in this work were pure materials. Therefore, both exhibit a relatively wide temperature range over which both solid and liquid phases coexist. The antifoam behavior of these materials, shown in Figure 4.68, is therefore complex. At low temperatures in region AB, an antifoam effect associated with solid hydrocarbon particles is present. Curiously, that effect appears to deteriorate with increase in temperature. However, in region BC, where both solid and liquid hydrocarbon coexist, a pronounced enhancement of the antifoam effect is seen to occur. This type of behavior has apparently also been observed by Kulkarni et al. [53] for impure triglycerides and by Joshi et al. [202] for an unspecified impure long-chain alcohol in a solution of a non-ionic surfactant. Here Joshi et al. [202] have... 

Eicosane / 04 Spectra Fingerprint Region. The very small shift in me 5, CH2 band in time - resolved spectra shown in Figure 12 indicates that exposure of a C20 surfactant-free water at 32 °C results in only very slight changes in... 

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