Interfacial Activity of Polydimethylsiloxane

  • M. J. Owen

Abstract

The polydimethylsiloxane (PDMS) polymer is an unusual macromolecular amphiphile composed of pendent organic methyl groups along the siloxane backbone. The combination of the low intermolecular forces associated with the methyl groups and the unique flexibility of the siloxane chain has resulted in a material with many important surface-related applications (liquid/air and solid/air phenomena). Familiar examples include the use of PDMS-containing materials as antifoaming agents, polyurethane foam stabilizers, and wetting agents. Interface-related applications (i.e., liquid/liquid and solid/liquid) are less familiar but growing in importance. Developing areas of this type include integral RIM (reaction injection moulding) release agents, de-emulsifiers, and dewatering aids. The structure/property/application correlation for PDMS is illustrated by a related trio of applications; antifoaming, de-emulsification, and dewatering. These are examples of destabilizing surface and interfacial activity at the air/liquid, liquid/liquid and solid/liquid interface respectively. This last area is the least well known so it is given the most emphasis. Dewatering of fine coal is the specific application chosen to illustrate this area.

Keywords

Surfactant Hydrocarbon Coherence Sewage Porphyrin 

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Copyright information

© Plenum Press, New York 1986

Authors and Affiliations

  • M. J. Owen
    • 1
  1. 1.Dow Corning CorporationMidlandUSA

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