Some thermodynamic quantities of n-alkanes as a function of chain length

Properties of Polyvinyl Alcohol Oligomers: A Molecular Dynamics Study

“…Such a behavior has been found previously by Dollhopf et al for n-alkanes. [26] Modifications of the RDF of oxygen and carbon as a function of the polymer length are in line with a priori expectations; the peaks become sharper in longer PVA oligomers. The mobility of the molecules is reduced and the viscosity of the melt is enhanced.…”

“…A similar linear dependence as encountered in the diagram has been reported previously by Dollhopf et al for nalkanes. [26] We want to mention that the extrapolated density of an infinite PVA chain as derived from the experimental values of isopropyl alcohol and 2,4-pentanediol is two times smaller than the one which is actually found. [19,20] Therefore, only the specific volumes of PVA oligomer systems with a chain length of N ¼ 5, 7, 10 have been used to estimate the PVA density in the limit N !…”

Conformational properties ofn-alkanes

“…However, one has to take into consideration that one or more solid state transitions occur in some n-alkanes [10][11][12][13][14]. The so-called rotational transition which anticipates a substantial portion of the melting entropy occurs in the odd-numbered n-alkanes between n = 9 and n = 40, but in the even-numbered not below n = 22.…”

Thermal and X-ray measurements on n-hexatriacontane (C36H74)

“…This fact strongly indicates that the molecules jump out from the layer surface by the thermal motion. High pressure phase diagrams420 have been established for n-alkanes [14,15,[17][18][19][20][21][22] and polymers [23][24][25]. Josefiak et al performe DT A measurements under pressure for some nalkanes in the range C27 to C38 [14].…”