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The influence of branching efficiency on the rheology and morphology of melt state long chain branched polypropylene/polybutene-1 blends

Publish Year: 1398
Type: Journal paper
Language: English
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JR_POJ-6-1_001

Index date: 10 June 2019

The influence of branching efficiency on the rheology and morphology of melt state long chain branched polypropylene/polybutene-1 blends abstract

In this study, the compatibility of the blends of polypropylene (PP) and polybutene-1(PB-1) homopolymer before and after long chain branching process were studied. The blends were prepared and long-chain branched directly via reactive extrusion process in presence of free radical initiator and trimethylolpropane tri methacrylate (TMPTMA) poly functional monomer. The optimum percentage of TMPTMA and PB-1 resin have determined by measuring the grafting efficiency and by studying the rheological behavior in shear steady state and transient extensional mode and the morphology of samples were investigated by scanning electron microscopy (SEM). Referring to the blends’ morphologies observed in SEM images which were approved by rheological data, it was found an enhanced compatibility in the blend by branching with 1.5wt% for TMPTMA and 10wt% for PB-1 resin. In this composition, the highest grafting efficiency of 37% and branch index of 5.2 achieved. The zero shear viscosity (η0) of PP is increased from 4500 Pa.s to 6800 Pa.s after branching process and enhanced more to 2400 Pa.s by using 10 wt% PB-1 resin. The Long-chain branched structure showed prominent higher zero-shear viscosity, longer relaxation time and pronounced strain-hardening behaviors. The branching behavior of samples were quantified by using extensional viscosity data and the branch index of samples were determined.

The influence of branching efficiency on the rheology and morphology of melt state long chain branched polypropylene/polybutene-1 blends Keywords:

The influence of branching efficiency on the rheology and morphology of melt state long chain branched polypropylene/polybutene-1 blends authors

Ali Foroozan

Faculty of Processing, Iran Polymer and Petrochemical Institute, P.O. Box: ۱۴۹۶۵/۱۱۵, Tehran, I.R. Iran

Tahereh Behboodi

Faculty of Processing, Iran Polymer and Petrochemical Institute, P.O. Box: ۱۴۹۶۵/۱۱۵, Tehran, I.R. Iran

Yousef Jahani

Faculty of Processing, Iran Polymer and Petrochemical Institute, P.O. Box: ۱۴۹۶۵/۱۱۵, Tehran, I.R. Iran

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