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D. Żuchowska, Z.P. Zagorski


Modification of polymer blends by irradiation


Polimery 1999, No 7-8, 514


DOI: dx.doi.org/10.14314/polimery.1999.514


Summary

Modification of polymers, especially of polyolefin—elastomer blends (e.g. ethylene/propylene/diene terpolymer, ethylene/propylene copolymer, ethylene/vinyl acetate copolymer, etc.), by irradiation with a beam of fast electrons is discussed. Irradiation of polymer blends usually results in enhanced interactions between the constituents, caused among other things, by grafting induced at the polymer interphase. As a result, mechanical properties are affected to an extent depending on the proportion and type of constituent polymers, stabilizer content, and radiation dose. Breaking strength (σ) , relative elongation at break (ε) and melt flow rate (MFR) were examined for a triblock styrene/butadiene/styrene (SBS) copolymer; polypropylene (PP), and a PP—SBS blend (50:50 by wt.). In PP, the content of the crystal phase was determined (Table 1). Irradiation was found to make SBS crosslink, as a result, σ rose by 25 % and ε remained unaffected. PP was found to become degraded upon irradiation (MFR rose as much as 16 times), whereby σ and ε decreased considerably. In pure PP, the content of the crystal phase was found to increase. The variations of σ and ε in the irradiated PP—SBS blend follow a tendency similar to that in the SBS copolymer examined. This fact suggests the SBS copolymer to have a decisive effect on the macroscopic properties of the PP-SBS blend.


Keywords: polyolefin-elastomer blends, modification by irradiation, polypropylene - triblock styrene/butadiene/styrene copolymer system, irradiation with a fast-electron beam and its effect on mechanical properties, crystallinity, and fluidity


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