Structure of ultrahigh-molecular-weight polyethylene in the solid state as studied by variable-temperature 13C CP/MAS NMR spectroscopy

✍ Scribed by S. Akiyama; T. Komoto; I. Ando; H. Sato

• Publisher: John Wiley and Sons
• Year: 1990
• Tongue: English
• Weight: 434 KB
• Volume: 28
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/polb.1990.090280411

✦ Synopsis

Abstract

In order to obtain some insight into the structure of an ultrahigh‐molecular‐weight polyethylene sample, ^13^C CP/MAS NMR experiments have been carried out at temperatures from 23 to −108°C. The peak for the crystalline component moves upfield with a decrease in temperature, which is contrary to what was reported previously for a melt‐crystallized polyethylene sample. On the basis of x‐ray diffraction results and quantum‐chemical calculations, it is suggested that the methylene carbons are in the distorted orthorhombic form at low temperatures.