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Radiation effects in polypropylene/polystyrene blends as the model of aromatic protection effects

Głuszewski W., Zagórski Z. P.

Nukleonika

2008

Vol. 53, suppl. 1

21-24

A technically useful composition containing polypropylene (PP) as a principal constituent, expected to be working or to be processed in ionizing radiation field, e.g. for sterilization, has to be protected from undesired radiolysis resulting in radiation damage. Usually, conventional additives are used which are generally effective, especially when containing aromatic groups. They can be sometimes unacceptable, e.g. in medical applications. Polystyrene (PS) has been investigated as a protective component, in analogy to the classical case of cyclohexane/benzene system. Mechanical mixing of both polymers showed to be of modest effect, but two other procedures, of soaking polypropylene powder with polystyrene dissolved in styrene, or soaking with styrene and gamma preirradiation with resulting grafting (G = 12000 effects/100 eV), resulted in the composition of improved resistance towards radiation. The energy transfer, which explains the effect, is extended at a distance of 8-12 mers of polypropylene. The investigations have been made by gas chromatography and diffuse light reflection spectrophotometry (DRS), after 10 MeV electron beam irradiations.

Zastosowanie chromatografii gazowej (GC) w badaniach modyfikacji radiacyjnej polipropylenu

Głuszewski W., Zagórski Z.

Czasopismo Techniczne. Mechanika

2006

R. 103, z. 6-M

189-192

Zbadano wpływ zaabsorbowanego w polipropylenie i blendach polipropylenu z polistyrenem promieniowania jonizującego dużej mocy (wiązka elektronów przyspieszonych), w celu rozpoznania efektu ochronnego. Radioliza i mechanizmy ochronne były rozpoznawane z analizy produktów. Mało cząsteczkowe gazy H[2], CO, CH[4], 0[2] były oznaczane metodą chromatografii gazowej. Przenoszenie energii do związku aromatycznego zachodzi tak w ciekłej jak i stałej fazie, jednak w tej ostatniej zależy od jednorodności układu.

The effect of high power ionizing radiation (EB) absorbed by PP and PP/PS blends have been studied, to investigate the protection mechanism. The radiolysis and protection mechanisms were explored from products analysis. Low molecular weight gases H[2], CO, CH[4], O[2] were determined by gas chromatography. Energy transfer to aromatic compound takes place in both liquid and solid phase, but in the latter the efficiency depends on the homogeneity of the system.