Architecture：Paints and Coatings.pdfVIP

633 16 Paints and Coatings 1.0 INTRODUCTION Regardless of the type of paints or coatings and the field applica- tions, a study of their mechanical and chemical properties is necessary to understand their behavior and predict the performance. For example, paints (as discussed in Ch. 13) are dispersions of one or more liquid or solid phases in a liquid or solid matrix. Such materials exhibit very complex responses to the application of quite small forces. Some paints (thixotropic) look like solids or very viscous liquids when at rest in the container and become thin when stirred. They will recover their original appearance when allowed to rest.[1] These complex responses are related to the rheological properties of the material. Resistance to weather is an important perfor- mance aspect, which affects durability. This is critical for paints applied to exteriors of houses and buildings, ships, chemical plants, agricultural imple- ments, and cars. The mechanical properties of paints and coatings can be studied by application of various standard mechanical test methods, whereas chemical characterization can be achieved using a variety of analytical techniques 633 634 Chapter 16 - Paints and Coatings such as gas chromatography (GC), gel permeation chromatography, high performance liquid chromatography (HPLC), infrared spectroscopy (IR), nuclear magnetic resonance spectroscopy (NMR), surface analysis, UV- visible spectroscopy, microscopy, x-ray diffraction, and thermoanalytical techniques. This chapter will deal with the applicability of thermoanalytical techniques for characterizing paints and coatings. Generally, the basic chemical components of paint and coating materials can be considered the same regardless of the field of application. Considerable