Yusuke Hiejima, Hikaru Kawada, Takumitsu Kida, Koh-hei Nitta. Raman spectroscopic observation of conformational changes during thermal exposure and its effects on melting and crystallization behavior of high-density polyethylene. Polymer Degradation and Stability. 2025. 232. 111152-111152
Misato Nabata, Takumitsu Kida, Yusuke Hiejima, Koh-hei Nitta. In-situ Raman spectroscopic study of conformational reorganization during heat treatment for high-density polyethylene solid. Polymer. 2024. 290. 126558-126558
Yusuke Hiejima, Nobuhiro Misumi, Ryohei Ippitsu, Takumitsu Kida, Masahiro Higuchi, Hiroyuki Yamada, Koh-hei Nitta. Compressive double yielding in high-density polyethylene over a wide range of strain rates. Polymer. 2023. 126590-126590
Asae Ito, Akid Ropandi, Koichi Kono, Yusuke Hiejima, Koh-hei Nitta. Additive Effects of Solid Paraffins on Mechanical Properties of High-Density Polyethylene. Polymers. 2023
Takumitsu Kida, Yusuke Hiejima, Koh-hei Nitta, Masayuki Yamaguchi. Evaluation of microscopic structural changes during strain hardening of polyethylene solids using In situ Raman, SAXS, and WAXD measurements under step-cycle test. Polymer. 2022. 250. 124869-124869
Takumitsu Kida, Yusuke Hiejima, Koh Hei Nitta, Masayuki Yamaguchi. Rheo-Raman Spectroscopic Study of Microscopic Deformation Behavior of Lowand High-Density Polyethylene Solids under Uniaxial Deformation. Nihon Reoroji Gakkaishi. 2022. 50. 3. 287-294
Asae Ito, Koh-hei Nitta. Additive Effects of Lithium Salts with Various Anionic Species in Poly (Methyl Methacrylate). Molecules. 2021. 26. 13. 4096-4096
Koh-hei Nitta. Topological Characteristics of Chain Molecules with Branching and Molar-Mass Distributions. Macromolecular Theory and Simulations. 2021. 30. 3
Takumitsu Kida, Ryo Tanaka, Yusuke Hiejima, Koh hei Nitta, Takeshi Shiono. Improving the strength of polyethylene solids by simple controlling of the molecular weight distribution. Polymer. 2021. 218
Yusuke Hiejima, Takumitsu Kida, Koh-hei Nitta. In situ Raman Spectroscopic Observation of Polymer Chains in Semi-Crystalline Polyethylene Solids. Zeitschrift für Physikalische Chemie. 2021. 235. 1-2. 59-79
Oyama, Y., Hiejima, Y., Nitta, K.-H. Swelling behavior of butyl and chloroprene rubber composites with poly(sodium acrylate) showing high water uptake. Journal of Applied Polymer Science. 2020. 137. 14. 48535-48535
Hiejima, Y., Okuda, T., Kono, K., Nitta, K.-H. Orientation behavior and deformation mechanism of polyethylene gels during cold drawing determined by in situ Raman spectroscopy. Polymer. 2019. 176. 30-37