Adsorption and Wetting from Tunable Polyolefin Mixtures
Polymer blends and alloys are increasingly used as structural and functional materials with desirable combinations of the different components. Often the nature of the interfaces exposed either at the air surface or at a substrate on which the blend is deposited play an important role in determining the suitability of the alloy used. For example, in controlled drug release it is desirable to be able to modify the permeability of the surface layers in drug-containing polymeric microspheres. On a different level, the surface wettability (by paints, for example) of polyolefin blends used increasingly in the automotive industry is a central determinant of their suitability. At the same time, understanding the nature of surface enrichment and wetting in such polymer-polymer mixtures presents a significant scientific challenge1. Important questions are: what are the factors that control which of the blend components will enrich or wet the surfaces? are the interactions enthalpic (the classical picture) or entropie in origin? can we a priori design molecules that will segregate as desired to one or another interface? what is the nature of the surface fields that control these processes? how fast do wetting layers grow? and so on.
KeywordsSurface Segregation Surface Field Surface Enrichment Deuterium Label Bare Silicon
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