学術雑誌論文 Microscopic structurall changes during photodegradation in low-density polyethylene detected by Raman spectroscopy

Hiejima, Yusuke  ,  Kida, Takumitsu  ,  Takeda, Kento  ,  Igarashi, Toshio  ,  Nitta, Koh-hei

150pp.67 - 72 , 2018-04-01 , Elsevier
ISSN:0141-3910
NII書誌ID(NCID):AA00362801
内容記述
金沢大学理工研究域自然システム学系
Raman spectroscopy has been used to reveal the microscopic structural changes of low-density polyethylene under ultraviolet irradiation. The fraction of non-crystalline consecutive trans chains (the molecular chains in the trans conformation separate from the orthorhombic crystalline phase) drastically decreases at ∼600 h, together with a decrement in the molecular weight and an increment in the crystallinity owing to chemicrystallization. This suggests that short trans chains are prolonged to form consecutive trans chains before chemicrystallization. Moreover, gradual increases of the stretching and compression stresses are observed on the trans and amorphous chains, respectively. These conformational changes are detected by Raman spectroscopy even in the early stage of photodegradation. Chemicrystallization at ∼600 h is accompanied by structural changes, such as shortening of the interchain distance of the lamellar crystals and thinning of the amorphous layer, which induce formation of surface cracks on the macroscopic specimen.
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