Glass fragility, experimental determination

In an acid-base titration, you carefully measure the volumes of acid and base that react. Then, knowing the concentration of either the acid or the base, and the stoichiometric relationship between them, you calculate the concentration of the other reactant. The equivalence point in the titration occurs when just enough acid and base have been mixed for a complete reaction to occur, with no excess of either reactant. As you learned in Chapter 8, you can find the equivalence point from a graph that shows pH versus volume of one solution added to the other solution. To determine the equivalence point experimentally, you need to measure the pH. Because pH meters are expensive, and the glass electrodes are fragile, titrations are often performed using an acid-base indicator. 

In this article, we have discussed two different topics related to the glass transition of thin polymer Aims. As the first topic, we have shown the experimental results of the glass transition and a-dynamics of stacked thin polymer films measured by DSC and DRS. It has been revealed that interfacial interaction can play a crucial role in determining how Tg deviates from the value of the bulk system if the thickness decreases from that of the bulk. Furthermore, annealing above Tg can induce a change in the interfacial interactirMi between thin layers, and this can control the fragility and the non-Arrhenius behavior. 

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