Effect of TMPTMA on the branching efficiency and long chain branching of PP/PB-1 blends

Long chain branching of PP/PB-1 blends was achieved by reactive extrusion in the presence of trimethylolpropane trimethacrylate (TMPTMA) trifunctional monomer and peroxide of dicumyl peroxide (DCP). Influence of TMPTMA concentrations on the grafting degree at 0.6, 1, 1.5 and 2 wt% was evaluated. The branching reactions were confirmed by Fourier transformed infrared spectroscopy (FTIR) and nonlinear extensional rheology in which the formation of long chain branching structure can be thoroughly investigated by the well-known strain hardening behavior. Results indicated that TMPTMA was grafted onto PP/PB-1 backbone and grafting efficiency of 1.5%-TMP sample is the highest among others

کلیدواژه ها:

Polypropylene ، Branching process ، Reactive extrusion ، Extensional rheology