Gel permeation chromatography (GPC) was used to study the average (apparent) molar mass (Mn and Mw) and molar mass dispersity (Ð) of the synthesised copolymers. The analysis was carried out using an HPLC Agilent 1200 series modular system with a refractive index detector (RID) which was equipped with two PLgel 5µm MIXED-C columns (300x7.5mm) connected in series. Samples were prepared in chloroform (CHCl3) at a concentration of 3mg/ml and filtered through a 0.2µm polytetrafluoroethylene (PTFE) membrane. Data were recorded using "ChemStation for LC" and analysed using "ChemStation GPC Data Analysis Software".