Abstract
Aqueous suspensions containing polymeric nano particles (PNPs) of Poly (L-lactide) are prepared by interfacial deposition in two different mixed solvents (dichloromethane+n-hexane and dichloromethane+chloroform) and in the presence of stabilizers. The PNPs are characterized by FT-IR spectra, DSC and XRD measurements. The particle size is determined by TEM analysis and dynamic light scattering method. The influence of solvent on the size, shape and physicochemical properties such as crystalline nature, degree of dispersion, melting temperature, and stability of the suspensions is investigated. The size of PNPs is correlated with ultrasonic velocity and degree of dispersion with absorption coefficient. Experimental density and ultrasonic velocity values are compared with those calculated using theoretical Urick, Kuster–Toksöz and Urick–Ament models.
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