Loading a fragment of acrylic paint into a Thermomechanical analyzer (TMA) - this can accurately measure how much a paint fim expands and contracts under varying temperatures. In Component Two, methods for measuring these properties are being investigated with three types of instrumental techniques: thermal analysis, mechanical analysis, and surface characterization. Unfortunately, these properties can often be very hard to measure and quantify, as very slight variations in sample preparation or environmental conditions can dramatically alter the behaviour of a paint. Changes are probably also affected by the presence and nature of pigments and diluting agents, exposure to light, and the age of the material.
Such changes in the physical properties of paints may strongly influence phenomena such as surface texture, color, gloss, rates of soiling, and development of cracking.
Synthetic paint media may expand, soften, and even become sticky upon heating and, conversely, turn extremely brittle at lower temperatures. The way in which paint films respond to fluctuations of temperature and relative humidity in their environment is governed by their physical properties. Here, tissue paper has become stuck to the surface of an acrylic painting. As temperature rises, acrylic paints become softer.
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