The radiation stability upon exposure to high-energy radiation of different bi- and terpolymers such as poly[propylene-co-4-(hept-6-enyl)-2,6-di-tert-butylphenol], poly(propylene-co-6-phenylhex-l-ene) and py[prpyene-c-4-(hept-6-eny)-26-di-tert-butyphen-c-4-(hex-5-eny)-2266-tetramethypiperidine] was studied. The films were exposed to a radiation dose of 25 kGy. The extent of radiation-induced degradation of the samples was determined by size exclusion chromatography. The most stable polymers found were a copolymer containing 0.82 wt% of 4-(hept-6-enyl)-2,6-di-tert-butylphenol and a commercial radiationresistant polypropylene. The copolymers containing chemically bound hindered phenol moieties exhibited better protective properties than polypropylene reference samples containing the same concentration of admixed 3-(3,5-di-tert-butyl-4-hydroxylphenyl)propionate (Irganox 1010). The copolymers containing 6-phenylhex-1-ene or admixed phenyl decane showed reasonably good stability against radiation, whereas the formulations containing hindered amine light stabilizers showed relatively poor radiation stability.
Посилання на статтю:
Radiation stability of in situ stabilized polypropylene / Kenneth B. Ekman, Carl-Eric Wil6n and Jan H. Niisman* // Polymer. – 1993. – Vol 34. – P. 3757-3759.