Μακρομοριακή αρχιτεκτονική συμπολυμερών με πολυ(διμεθυλοσιξάνη): σύνθεση - χαρακτηρισμός - ιδιότητες

Abstract

The present research work involves the synthesis, the molecular and morphologicalcharacterization of linear diblock copolymers of the PS-b-PDMS type and miktoarm starcopolymers of the PS(PDMS)n=2,3 and PDMS(PS)n=2,3 type respectively.Anionic polymerization via high vacuum techniques was employed along withsequential addition for the synthesis of the diblock copolymers. Anionic polymerization alongwith chlorosilane chemistry was also employed for the synthesis of all miktoarm starcopolymers.All samples were characterized via various techniques such as: size exlusionchromatography (SEC), membrane (MO) and vapor pressure (VPO) osmometry, protonnuclear magnetic resonance spectroscopy (1H-NMR), differential scanning calorimetry (DSC)and transmission electron microscopy (TEM).The main goal of this research was to synthesize linear and miktoarm star copolymerswhere the one block is polystyrene (PS) and the second polydimethylsiloxane (PDMS) andthe morphological characterization in order to make a first comparison between theexperimental data and the theoretical predictions already known for the PS-b-PI andPS(PI)n=2,3 system. Also an effort to explain the similarities and the discrepancies between theadopted morphologies of the PS/PDMS linear and non linear copolymers and the theoreticallypredicted through phase diagrams constructed via SCFT and experimental data for PS/PIsystems was made.