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Citation: FANG Hai-Xia, YE Yong-Cheng, BAI Fu-Chen. Photo-oxidation Stability of Metallocene Catalyzed Linear-Low Density Polyethylene[J]. Chinese Journal of Applied Chemistry, ;2005, 22(2): 164-167. shu

Photo-oxidation Stability of Metallocene Catalyzed Linear-Low Density Polyethylene

1.
Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022

Corresponding author: YE Yong-Cheng,
Received Date: 20 March 2004
Available Online: 16 June 2004

The films of linear-low density polyethylenes made with metallocene catalyst and Ziegler-Natta catalyst respectively and low density polyethylene, were irradiated with a Xenon lamp for various time to examine their photo-oxidation stability. The mechanical property and chemical structure changes occurred during the photo-oxidation process were studied by mechanical property measurement and FTIR spectroscopy. The results show that both the branching degree and crystallinity of polyethylenes increase after photo-oxidization. The concentration of vinylidene decreases gradually with the prolongation of irradiation time, while that of end-vinyl increases due to NorrishⅡ reaction. Ethylene-hexene copolymerized m-LLDPE is more inclined to be photo-oxidized than ethylene-octene copolymerized LLDPE due to the higher concentration of vinylidene in the former. The photo-oxidation stability of the other two ethylene-octene copolymerized m-LLDPEs is comparable to that of LLDPE with the same comonomers. The oxidation rate of LDPE studied in the paper is slower than those of all the LLDPEs.
- metallocene linear-low density polyethylene,
- Ziegler-Natta linear-low density polyethylene,
- photo-oxidation stability
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