GLASS TRANSITION REGION OF A PHOTO-CURED DIMETHACRYLATE - EFFECT OF DEGREE OF CURE AND CONTINUED POLYMERIZATION DURING MEASUREMENT

摘要

All amorphous materials exhibit a glass transition that marks the change from a glassy state to a liquid-like state. The glass transition temperature (Te) is one of the most important parameters of a polymer as it determines the maximum use temperature (for glasses) and the minimum use temperature (for rubbers). In addition, the TE determines the minimum polymerization temperature that can be employed for full conversion to polymer. However, the glass transition docs not really occur at a specific temperature but moreover in a temperature range. Thus the performance of a polymer is also dependent on the breadth of the transition so that, for example, a broader transition results in a higher heat distortion temperature.