Abstract
Photon correlation spectroscopy has been used to study structural relaxation dynamics near the glass transition temperature for glass-forming linear chain molecules differing in the number of repeat units. Complementary investigations of the low-frequency vibrational dynamics were performed by means of Raman spectroscopy. The systems studied range from the low molecular weight liquid propylene glycol (PG, molecular weight (MW)=76) to the polymer, poly(propyleneglycol) (PPG, M W=4000). Differences are observed in terms of the fragility of the systems. The findings are attributed to bonding between the hydroxy endgroups which decrease in density as the MW increases.
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