Broadband dielectric spectroscopy (10 -2 −10 9 Hz) and temperature-modulated differential scanning calorimetry have been performed to study the molecular dynamics of monomer, dimer, and trimer of propylene glycol mono methyl ether (PGME) confined in a two-dimensional layer-structured Na-vermiculite clay. A slight speeding up of the main α relaxation due to the confinement is observed, while the secondary and more local β relaxation is unaffected by the confinement. It was also found that the fragility increased with increasing M w in both bulk and confined samples. These effects can be attributed to the network formation via hydrogen bonds. We also found indications for a low-dimensional character of the correlation volume involved in the glass transition of PGME and its oligomers.
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Cerveny et al. (2004) studied this question.
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