고압력 수소 가스 처리에 의한 고밀도 폴리에틸렌의 수소화

Abstract

To investigate the alterations in the chemical and physical properties of high-density polyethylene (HDPE) following the rapid release of hydrogen gas at a pressure of 90 MPa, a variety of characterization techniques were employed. These included scanning electron microscopy, optical microscopy, polarized optical microscopy, volume measurement for hydrogen content and diffusivity, and in-situ attenuated total reflectance Fourier transform infrared spectroscopy. Microscopic observations confirmed the occurrence of chain scission and channel formation during hydrogen release. Volumetric measurements yielded a hydrogen diffusivity of 2.41×10-9 m²/s and a total hydrogen content of 714 wt∙ppm in hydrogen-treated HDPE. Chemically, hydrogenation occurred post-chain scission, involving the addition of hydrogen atoms to the polymer chains. An increase in -CH3 end termination and elevated double and triple bonds between carbon atoms, along with crosslinking, were also observed. These findings suggest that chemical modifications and structural transformations took place in HDPE upon the rapid release of hydrogen gas.