Abstract
The elastic and thermal properties of lower aminoalcohols with different chemical structures were measured by Brillouin scattering and Modulated Differential Scanning Calorimetry (MDSC). The glass transition of pure substances of propylene glycol (PG), 1-amino-2-propanol (12AP) and 2-amino-1-propanol (21AP) were investigated. It is found that the glass transition temperatures and their glass-forming tendency and behavior of elastic properties are affected by the structure of molecules. The substitution effect of hydroxyl to amino moiety was resulted in stronger intermolecular interactions, higher glass transition temperature and more rigid in network structure in AP. It is found that the tendency of vitrification in AP series was much lower than PG since they are easily felled into crystallization. The structural relaxation time was derived by using the simple viscoelastic theory and it obeys the Arrhenius law. The results indicated similar tendency, therefore the relaxation process which coupled to acoustic wave is deduced to mainly their similar backbone structure.
