Naslov
EFFECT OF SOLVENT ON RADIATION GRAFTING AND CROSSLINKING OF POLYETHYLENE

Autori
Ranogajec, Franjo

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
11th Tihany Symposium on Radiation Chemistry / Sáfrány, Á ; Kovács, A - Budimpešta : Insitute of Isotopes, 2006, 82-82

Skup
11th Tihany Symposium on Radiation Chemistry

Mjesto i datum
Eger, Mađarska, 26.08.2006. - 31.08.2006

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
Radiation grafting; pre-crosslinking; swelling; tenzile properties; effective crosslinks

Sažetak
Termination reaction in grafting of liquid monomer onto polyethylene is in most cases viscosity dependent and diffusion controlled. The viscosity could be changed by changing the monomer concentration inside the film. Such behaviour was clearly demonstrated by grafting of polyethylene in a mixture of styrene and methanol. Crosllinking of polyethylene influences its swelling properties. It could be expected that pre-crosslinking of polyethylene influences the rate and yield of grafting as well. This is demonstrated by pre-crosslinking of polyethylene and by its subsequent grafting with styrene after the trapped radicals had been annealed out. Grafting was induced by simultaneous irradiation or by preirradiation in vacuum. For pre-crosslinked polyethylene the grafting rate is higher than for the uncrosslinked polymer. However, to high degree of crosslinking causes the grafting rate to fall below that of the native polymer. The increased grafting yield at low crosslinking density is interpreted in terms of gel-effect. In order to obtain more direct information about the influence of swelling agent on polyethylene crosslinking the elastic modulus of the crosslinked polyethylene was investigated. Stress-strain curve of polyethylene samples irradiated in different environments were recorded in molten state at 165 oC. The results show that irradiation of swollen polyethylene produces fewer effective crosslinks than does irradiation of dry polymer.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA