𝔖 Bobbio Scriptorium
✦   LIBER   ✦

13C-NMR study of ethylene/1-hexene and ethylene/1-octene copolymers obtained using homogeneous catalysts

✍ Scribed by Griselda B. Galland; Raquel S. Mauler; Sônia C. Menezes; Raul Quijada

Publisher
Springer
Year
1995
Tongue
English
Weight
253 KB
Volume
34
Category
Article
ISSN
0170-0839

No coin nor oath required. For personal study only.

✦ Synopsis

This study employed the~3C-NMR spectroscopy to investigate the influence of the increase of the comonomer concentration on the microstruture of ethylene/1hexene and ethylene/1-octene copolymers obtained by the use of MeSiCp2ZrC12, Cp2ZrC12,, Et[Ind]2ZrC12 and [Ind]2ZrCl2 catalysts. For both comonomers butyl or hexyl branches were isolated between ethylene blocks. As the ct-olefm concentration in the copolymer increased, butyl or hexyl branches became closer, some of them, separated by only one or two ethylene units. Incorporation of ct-olefm in the copolymer was higher for the bridged catalysts, MeSiCp2ZrCI2, and Et[Ind]2ZrC12 than for the unbridged ones. The ~-olefin size did not seem to effect its reactivity towards ethylene.

📜 SIMILAR VOLUMES

Morphology of homogeneous copolymers of
Morphology of homogeneous copolymers of ethylene and 1-octene. II. Structural changes on annealing
✍ M. Peeters; B. Goderis; H. Reynaers; V. Mathot 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 283 KB 👁 2 views

Based on DSC evidence, annealing of ethylene-1-octene copolymers results in a gradually increasing thermal stability of the original, metastable, crystals. SAXS and WAXD were used to monitor the structural changes involved after isothermal annealing for a fixed time at step-wise higher temperatures.

Characterization of homogeneous ethylene
Characterization of homogeneous ethylene/1-octene copolymers made with a single-site catalyst. CRYSTAF analysis and calibration
✍ Benjamín Monrabal; Javier Blanco; Jesús Nieto; João B.P. Soares 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 103 KB 👁 2 views

The crystallizability of narrow composition, homogeneous ethylene/1-octene copolymers made with a constrained geometry catalyst, measured by CRYSTAF, follows a straight line correlation with the amount of total comonomer incorporated. The potential use of these resins as standards to calibrate CRYST

Characterization of ethylene-1-butene co
Characterization of ethylene-1-butene copolymer by differential scanning calorimetry and 13C-NMR spectroscopy
✍ Keiichiro Kimura; Takeo Shigemura; Sakae Yuasa 📂 Article 📅 1984 🏛 John Wiley and Sons 🌐 English ⚖ 469 KB 👁 1 views

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