Foroozan, Ali; Behboodi, Tahereh; Jahani, Yousef published the artcile< Influence of branching on the rheology and morphology of melt state long-chain branched polypropylene/polybuten-1 blends>, Related Products of 3290-92-4, the main research area is polybutene polypropylene blend branching viscosity.
In this study, the compatibility of polypropylene (PP)/polybutene-1 (PB-1) homopolymer blends before and after a long-chain branching process was studied. The blends were prepared and long-chain branched directly via a reactive extrusion process in the presence of a free radical initiator and trimethylolpropane trimethacrylate (TMPTMA) poly functional monomer. The optimum percentage of TMPTMA and PB-1 resin was determined by measuring the grafting efficiency and by studying the rheol. behavior in steady state shear and transient extensional mode and the morphol. of samples was investigated by SEM. The morphol. observations, which were also approved by rheol. data, demonstrated an enhanced compatibility for the blend branched with 1.5wt% of TMPTMA and 10wt% of PB-1 resin. The highest grafting efficiency of 37% and branch index of 5.2 were achieved for this blend composition The zero-shear viscosity (η0) of PP increased from 4500 Pa.s to 6800 Pa.s after branching process, and further enhanced to 2400 Pa.s by using 10 wt% PB-1 resin. The long-chain branched structure of blend resulted in a prominent higher zero-shear viscosity, a longer relaxation time and a pronounced strain-hardening behaviors. The branch index of blend samples were determined, and their branching behavior was quantified using extensional viscosity data.
Polyolefins Journal published new progress about Branched polymer chains. 3290-92-4 belongs to class esters-buliding-blocks, and the molecular formula is C18H26O6, Related Products of 3290-92-4.
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Ester – an overview | ScienceDirect Topics