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An investigation of the dependence of penetration on the temperature and composition of paraffin waxes
Author(s) -
Matth?i Michael,
Laux Horst,
Hildebrand G?nter
Publication year - 2001
Publication title -
european journal of lipid science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.614
H-Index - 94
eISSN - 1438-9312
pISSN - 1438-7697
DOI - 10.1002/1438-9312(200105)103:5<292::aid-ejlt292>3.0.co;2-1
Subject(s) - crystallinity , wax , enthalpy , differential scanning calorimetry , paraffin wax , melting point , chemistry , thermodynamics , crystallization , penetration (warfare) , melting temperature , calorimetry , materials science , organic chemistry , crystallography , physics , operations research , engineering , composite material
A general penetration/temperature function for paraffin waxes was derived for the temperature range from 25 °C to 40 °C. In this function each individual temperature is entered as the difference to the theoretical melting temperature of the n‐alkanes of the mixture. The theoretical melting temperature of the n‐alkanes was determined based on the results of a gas chromatography (GC) analysis. The dependencies of the parameters of this function were investigated on the basis of the GC and differential scanning calorimetry data of the slack wax, paraffin waxes and the urea adducts obtained from paraffin waxes with different gradations. Particularly the influence of crystallinity as a link between composition and physical properties was considered in this context. Crystallinity was defined as the ratio of the melting enthalpy of the respective product to the melting enthalpy of the n‐alkanes it contained, with ideal crystallisation assumed. It was demonstrated that, in addition to crystallinity, the chain length of the n‐alkanes also plays a decisive role in the penetration/temperature behaviour.