Qianping RAN 1, 2, Hua ZOU 1, Shishan WU 1, Jian Shen 1 1School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China 2 Jiangsu Institute of Building Science, Nanjing 210008, China
Some oxygen-containing groups such as C=O, C-O and -OH were introduced onto linear low-density polyethylene (LLDPE) chains by UV irradiation in air. Their concentration increased with the irradiation time. Crystal shape of the irradiated LLDPE remained an orthorhombic structure, while space of the crystalline plane kept unchanged. The melting temperature and crystallinity decreased due to the LLDPE chain scission into small molecules compound and crystalline defects caused by UV irradiation [1,2]. Compared with pristine LLDPE, hydrophilicity of the irradiated LLDPE increased due to the introduction of polar oxygen-containing groups, but the tensile strength decreased due to the LLDPE chain degradation and reduction of crystallinity. The temperature of initial weight loss of the irradiated LLDPE was lower than that of pristine LLDPE.
Ultraviolet irradiation; Functionalization; LLDPE; Structure and properties
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