Meaning
Aliphatic hydrocarbons containing side groups represent a distinct molecular class used in polymer lubrication and plasticization. These branched iso-alkanes offer higher oxidative stability than linear chains while maintaining a low pour point. The presence of side chains prevents the tight molecular packing associated with wax formation.
Sourcing for polymer lubricants often prioritizes these molecules to ensure consistent mould release without surface bloom. The classification excludes linear paraffins and aromatic compounds.
Structural Interaction
Molecular branching determines the internal friction and viscosity of the polymer melt during high speed injection. Because branched iso-alkanes occupy a larger hydrodynamic volume than their linear counterparts, they provide lubrication at the interface of the melt and the tool steel.
Thermal Resistance
Resistance to degradation at elevated processing temperatures is a primary attribute of these branched structures. While linear alkanes might volatilize or crack under the intense heat of a moulding barrel, the branched iso-alkanes remain stable. Such stability prevents the formation of gaseous voids or surface splay in the finished part.
Lubrication Quality
Inclusion of these molecules in a masterbatch ensures that the final product maintains its physical properties across a wide temperature range. Proper selection of branched iso-alkanes reduces the ejection force required for deep-draw parts.
