Rheo-optical Raman study of microscopic deformation in high-density polyethylene under hot drawing. (July 2015)

• Record Type: Journal Article
• Authors: Kida, Takumitsu; Hiejima, Yusuke; Nitta, Koh-hei
• Is Part Of: Polymer testing. Volume 44(2015)
• Page Start: 30
• Page End: 36
• Publication Date: 2015-07
• Subjects: High-density polyethylene -- In situ Raman spectroscopy -- Hot drawing; Polymers -- Testing -- Periodicals; Polymères -- Tests -- Périodiques; 620.1920287
• DOI: 10.1016/j.polymertesting.2015.03.018
• Languages: English
• ISSNs: 0142-9418

Abstract

Abstract: 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.