glass transition temperature
That temperature at which an adhesive loses its
flexibility and becomes hard, inflexible, and
"glasslike." An adhesive which reaches the "glass
transition temperature" is subject to failure if
flexed. Glass transition temperatures for
adhesives vary greatly, from 105° C.
(polymethyl methacrylate) to well below 0
° C. If flexibility is required of the
adhesive, the glass transition temperature can be
lowered, either by means of plasticizers, or a
polymer with a naturally low glass transition
temperature.
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