Chain Conformation and Characterization in Polymer Langmuir-Blodgett Films

(Faculty of Textiles, Sichuan University, Chengdu, 610065, Tel. In addition to theoretical interest, the adsorption and adsorption conformation of polymers at the interface also involves a wide range of technical fields, such as adhesion, lubrication, stabilization or defoaming, colloidal The dispersion of the system.In recent years, this research has also expanded to biological and pharmacological studies, such as the study of the adsorption of many biological macromolecules on the natural interface (such as cell membrane), or artificial interface (such as prosthesis). In the past 40 years, the polymer interface has attracted a great deal of attention from chemistry, physics, mathematics, and biochemists, especially the involvement of physics and mathematics, which has brought people into the rational stage of understanding the direction of this discipline. With the knowledge of physics tools and polymer chemistry, we have constructed a theoretical model for the conformation of adsorbent polymer flexible chains, such as Mushroom, pankake, or brushes of adherent polymers. Models, as well as multi-pointed loops and trains, are understood more and more clearly on the interface. Molecules rely on weak non-bonding forces such as intermolecular interactions and hydrophobic interactions to produce the nature of adsorption and formation of stable conformational states, as well as the dynamics that tend to stabilize conformational movements, as deGennes uncovered the laws of movement of soft materials in the mesoscopic world. Nowadays, one can predict the conformation of a polymer in terms of the chemical structure of a macromolecule, and a theoretical model can be verified experimentally.In the past 10 years, high-performance instruments for detecting the structure and dynamics of polymer chains at the interface have been used. One of the most effective experimental tools is the Langmuir-Blogett membrane analyzer, as well as the two-dimensional mechanical and electrical measurement technology, sensitive image technology, and sensitive chromatography technology that can be matched with this. In addition, the development of high-speed computers makes Statistical simulations of molecular conformations have become more convenient, and advanced polymer synthesis and separation technologies have made it easier for people to obtain the model polymers and purer samples that they envisaged. All these technological advances have led to the adsorption and adsorption of polymers. The domain of conformation.

The amphiphilic polymer adsorbed at the gas/liquid interface must adopt the lowest thermodynamic energy conformation due to the lyophobic and intermolecular forces. Different physical measurements can be used as a function of the surface area of ​​the molecule to obtain information on the conformation of germanium molecules in the interface. These physical quantities can be measured by Langmuir-Trough and its associated test components (such as surface tension, surface potential meter, surface viscometer, Brewster angle microscope, Infrared reflectance spectrometer, etc.) to characterize: further transfer of the polymer monolayer film to the solid matrix by the LB film technology, X-type, Z-type, and Y-type multilayer films can be obtained. This accurate thickness of the multimolecular layer aggregate can be used In many high-tech fields, molecular microelectronic components, photoelectric conversion, biopharmaceuticals, microsensors, etc. have been or are being widely used. This paper briefly introduces the principles and experimental methods of the L and LB membrane technologies and their related test technologies.

Acknowledgments: Projects funded by the Specialized Research Fund for the Doctoral Programs of Higher Education Institutions (fund No. 20010610024).