CONTROL OF SURFACE CHEMICAL-STRUCTURE AND FUNCTIONAL PROPERTY OF LANGMUIR-BLODGETT-FILM COMPOSED OF NEW POLYMERIZABLE AMPHIPHILE WITH A SODIUM-SULFONATE

A new amphiphile with a sodium sulfonate and two polymerizable alkyl chains, sodium 1,2-bis[[[16-(acryloyloxy)hexadecyl]oxy]carbonyl]ethane-1-sulfonate (2AC16SNa), was synthesized. 2AC16SNa monolayer on a pure water surface was composed of two-dimensional crystalline domains and became morphologically homogeneous by compressing it up to 35 mN.m-1. 2AC16ANa Langmuir-Blodgett (LB) film transferred to a polystyrene film by Langmuir-Blodgett techniques at the built-up pressure of 35 nN.m-1 had a bilayer lamella structure with a high degree of lamella-plane orientation. The monomeric LB film was polymerized to stabilize the surface chemical structure (hydrophilicity or hydrophobicity). The highly oriented bilayer lamella structure was retained even after polymerization. The hydrophilic and hydrophobic surfaces of the LB film were immobilized by polymerizations carried out in water and in air, respectively. This is due to the progression of interlayer and/or intramonolayer polymerizations in the LB film, resulting in the restriction of overturning of the outermost monolayer. The blood compatibility of the LB film composed of 2Ac16SNa was investigated on the basis of the interaction with human blood platelets. The polymerized LB film with a sulfonic group orienting normal to the LB film surface showed an excellent blood compatibility, mainly owing to its negatively charged surface which repelled platelets.