The effects of trimethylolpropane trimethacrylate (TMPTMA) on the long chain branching of PPR and PPR/PB-1 blend by reactive extrusion

In this study a long chain branch polypropylene was prepared by reactive extrusion in the presence of polybutene-1, peroxide and trifunctional monomer, trimethylolpropane trimethacrylate (TMPTMA). the effects of TMPTMA and PB_1 on branching is evaluated by measuring the viscoelastic behavior in shear mode of deformation. Long chain branched structure showed prominent higher zero-shear viscosity (ղ 0), complex viscosity and pronounced strain-hardening behavior. The Fourier transformed infrared (FTIR) results indicated that TMPTMA had been grafted to PP backbone. efficiency of branching can also be; witch decrease and then increase with TMPTMA concentration in both Neat PPR and PPR/PB_1

کلیدواژه ها:

long chain branch ، polypropylene copolymer random ، Polybutene-1 ، Rheology ، TMPTMA