Journal Article Rheo-optical Raman study of microscopic deformation in high-density polyethylene under hot drawing

Kida, Takumitsu  ,  Hiejima, Yusuke  ,  Nitta, Koh-hei

44pp.30 - 36 , 2015-07-01 , Elsevier
In situ observation of the microscopic structural changes in high-density polyethylene during hot drawing was performed by incorporating a temperature-controlled tensile machine into a Raman spectroscopy apparatus. It was found that the load sharing and molecular orientation during elongation drastically changed at 50°C. The microscopic stress of the crystalline chains decreased with increasing temperature and diminished around 50°C. Moreover, the orientation of the crystalline chains was greatly promoted above 50°C. These microscopic structural changes were caused by the thermal activation of the molecular motion within lamellar crystalline chains owing to the onset of relaxation of the crystalline phase. © 2015 Elsevier Ltd. All rights reserved.
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