Characterization of ethylene-1-butene copolymer by differential scanning calorimetry and 13C-NMR spectroscopy

✍ Scribed by Keiichiro Kimura; Takeo Shigemura; Sakae Yuasa

• Publisher: John Wiley and Sons
• Year: 1984
• Tongue: English
• Weight: 469 KB
• Volume: 29
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1984.070291018

✦ Synopsis

Two kinds of ethylene-l-butene copolymers that were produced by the different procedures, that is, the slurry and the high-pressure polymerizations, were characterized by differential scanning calorimetry (DSC) and carbon-13 nuclear magnetic resonance (W-NMR) spectroscopy. The melting points of both copolymers, were found to be different in spite of the same l-butene content. It was deduced that this phenomenon depended upon the subtly different chain structures between these two copolymers from the tetrad monomer sequence analysis by '3c NMR method. In addition, the behavior of the composition fractionation by temperature rising elution technique was also considered to be affected by the chain structures.