Chemical modification of poly (vinyl chloride) by NaOH solution at high temperatures

For first time poly (vinyl chloride) (PVC) was modified in NaOH/ethylene glycol (EG)/N,Ndimethylformamide (DMF) solution. The modification conditions in this study for NaOH concentration and temperature ranges are 0.5-2 mol/Lit and 130-160 °C respectively. Chemical modification of PVC with NaOH solution caused to decholorination of PVC through both direct substitution of Cl atoms by OH groups (SN2 mechanism) and straight elimination (E2 mechanism) of HCl (dehydrochlorination). The results of SEM analysis don’t indicate any change in the morphology of PVC particles, but histograms of particle size distributions represent a drop in average particle size. In addition, the GPC analysis was performed for determination the effect of chemical modification on average molecular weight (Mn and Mw) and molecular weight distribution change (PDI) in modified PVC

کلیدواژه ها:

PVC ، Chemically modification ، Dechlorination ، dehydrochlorination