1. Direct Force Measurement of Silicone- and Hydrocarbon-Based ABA Triblock Surfactants in Alcoholic Media by Atomic Force Microscopy
- Author
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Yihan Liu, Guangzhao Mao, Anfeng Wang, and Liping Jiang
- Subjects
Polydimethylsiloxane ,Poloxamer ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Hydrophobe ,Biomaterials ,chemistry.chemical_compound ,Colloid and Surface Chemistry ,Silicone ,chemistry ,Siloxane ,Polymer chemistry ,Copolymer ,Polyurethane ,Hydrophile - Abstract
icone polyether (SPE) surfactants. The SPE surfactants exhibit several unique properties (4): (1) they can lower the air/water interfacial tension to about 20 mN/m; (2) the siloxane chain remains flexible and in the liquid state up to high molecular weight; (3) they are surface active in both aqueous and nonaqueous media; and (4) they are suitable for cosmetic applications because they cause little skin irritation. The base of the SPE surfactants is polydimethylsiloxane (PDMS). PDMS with sufficient molecular weight, e.g., about 1000, is well known for its hydrophobicity as well as oleophobicity. In particular, the oleophobicity distinguishes the silicone-based surfactants from their hydrocarbon counterparts. The molecular structure of SPEs is either comblike, with the polyoxyalkylene chain side-grafted to a PDMS backbone, or linear diblock (AB) and triblock (ABA) types, with A representing the polyoxyalkylene hydrophile and B the PDMS hydrophobe. SPEs incorporating copolymers of polyoxyethylene (PEO) and polyoxypropylene (PPO) are widely used in polyurethane foam manufacture and personal care prod
- Published
- 2002