COMPARATIVE STUDIES REGARDING THE IMPACT OF THE SYNTHESIS POSSIBILITIES ON THE PHYSICO-CHEMICAL PROPERTIES OF POLY(N, N-DIMETHYLAMINOETHYL METHACRYLATE)

In this study the synthesis of poly(2-(dimethylamino) ethyl methacrylate) (PDMAEMA), via free radical polymerization by using three different variants of initiation namely azobis(isobutyronitrile) (AIBN), 4,4'-Azobis(4-cyanovaleric acid) (ACVA), and a redox system composed of potassium persulfate (KPS) and ascorbic acid (AscA), is presented. The structure and the molecular weight of the homopolymers, accordingly with the synthesis variant, were investigated by Fourier Transform Infrared Spectroscopy (FTIR) and static light scattering (SLS), respectively. The variation of the hydrodynamic diameter (D-h) of the PDMAEMA particles in relation with temperature was put into evidence by dynamic light scattering (DLS) technique. The PDMAEMA behavior during thermal degradation has been thoroughly investigated by thermogravimetry (TGA) coupled with FTIR and Mass Spectrometry (MS). In addition, the dielectric properties were put into evidence using a dielectric analyzer at different frequencies and temperatures. The dielectric spectroscopy study of the homopolymer samples showed that beta-relaxation is localized at low temperatures, while a further increase of temperature alpha-relaxation connected to glass transition is recognized only at high frequencies.