Rheological evaluation of electron beam irradiated polypropylene in the presence of a multifunctional monomer and polybutene resin

In this research, the rheological properties of electron beam irradiated polypropylene homo polymer (PP) containing Polybutene (PB) resin and Trimethylol Propane Trimethacrylate multifunctional monomer is studied. The effect of PB resin in inducing long chain branches on the PP backbone are evaluate...

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Bibliographic Details
Published in:Journal of applied polymer science 2012-02, Vol.123 (4), p.2036-2041
Main Authors: Zarch, F. Shamsoddini, Jahani, Y., Haghighi, M. Nekoomanesh, Morshedian, J.
Format: Article
Language:English
Subjects:
Applied sciences
branching
electron beam
Exact sciences and technology
Food irradiation
Free radicals
Grafting and modifications
Irradiation
Macromolecules
Materials science
mobilizer
Monomers
Physicochemistry of polymers
polybutene
Polymers
Polymers and radiations
polypropylene homopolyme
Polypropylenes
Resins
Rheology
Shear viscosity
Viscosity
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Summary:In this research, the rheological properties of electron beam irradiated polypropylene homo polymer (PP) containing Polybutene (PB) resin and Trimethylol Propane Trimethacrylate multifunctional monomer is studied. The effect of PB resin in inducing long chain branches on the PP backbone are evaluated by various viscoelastic parameters. The zero shear viscosity (η0) of samples containing 5% PB resin considerably decreased to 5500 Pa s, from η0 = 11,500 Pa s, which indicates the plasticizing effect of PB resin on the ease of movement of PP macromolecules. It is found that the presence of PB resin enhanced the branching by facilitating the movement of PP macromolecules in solid state and increasing the recombination efficiency of PP macro radicals. The mobilizing effect of PB resin also reduced chain scission and degradation of PP resin which is traced by shifting the cross over frequency. The PB free radicals formed during the irradiation process can bound to PP free radicals and suppress the degradation process. The evaluation of zero shear viscosity ratios and crossover point ratios of irradiated samples to un‐irradiated ones confirmed that using small amount of PB resin increase branching efficiency, which is the evidence of mobilizing effect of PB resin. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
ISSN:0021-8995
1097-4628
1097-4628
DOI:10.1002/app.34903