Wei Genshuan

Research on radiation stability of polypropylene

Abstract The effect of isotacticity of polypropylene(PP) on its radiation stability has been investigated in the present work. It was found that (1) The G value of H 2 and CH 4 is smaller if isotacticity of PP is higher; (2) It is easier to be crosslinked by radiation for the PP with higher isotacticity; (3) The shape of DSC peak changes smaller after irradiation for PP with higher isotacticity. These results have been explained by the measurement of 13 C-NMR and small angle X-ray scattering.

Effect of isotacticity on radiation stability of polypropylene under lower dose irradiation

Abstract Relationship between radiation stability and isotacticity of polypropylene was studied. It was found that the higher the isotacticity, the better the radiation stability under lower dose irradiation. Special PP power with higher isotacticity can keep the melting index change less after γ-irradiation in air. Furthermore, the special PP powder with higher isotacticity has lower intention of branching after 1 kGy γ-irradiation in vacuum and has lower intention of degradation after 5 kGy γ-irradiation in vacuum.

The effects of γ-irradiation on garlic oil content in garlic bulbs and on the radiolysis of allyl trisulfide

Abstract A study of the effects of γ-radiation on garlic oil content in garlic bulbs and on the radiolysis of allyl trisulfide and disulfide was carried out. The content of garlic oil in fresh garlic bulbs treated by gamma ray keeps nearly constant when stored for 10 months. The main components of garlic oil are allyl trisulfide (about 60%) and allyl disulfide (about 30%). The G values of radiolysis products of allyl disulfide and trisulfide in ethanol system were determined. The results show that allyl trisulfide is a very effective solvated electron scavenger and can oxidize CH 3 CHOH radical into acetaldehyde, which means that the formation of 2,3-butanediol is extensively inhibited.