Melt agglomeration surface plasticity

There are many different ways of thinking about the properties, functions, and classification of lubricants [5,8-20]. For example, in the case of internal lubricants for PVC, it is usually believed that, contrary to plasticizers, lubricants solvate only the surface of PVC spherical particles or nodules produced by agglomeration of PVC chains in the course of the polymerization reaction and that behave as independent units during the melt flow of the bulk polymer [21]. Thus the lubricant acts exactly as an oil in the case of bearing lubrication and the spherical agglomerates slide directly on a lubricant layer [22]. 

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