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Updated: Jan 26, 2026

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
Published on: November 27, 2015
Local Order and Dynamics of Nanoconstrained Ethylene-Butylene Chain Segments in SEBS
Michele Mauri1, George Floudas2, Roberto Simonutti3
1Department of Materials Science, University of Milano Bicocca, via R. Cozzi 55, 20125 Milan, Italy. michele.mauri@unimib.it.
Abstract:
Subtle alterations in the mid-block of polystyrene-b-poly (ethylene-co-butylene)-b-polystyrene (SEBS) have a significant impact on the mechanical properties of the resulting microphase separated materials. In samples with high butylene content, the ethylene-co-butylene (EB) phase behaves as a rubber, as seen by differential scanning calorimetry (DSC), time domain (TD) and Magic Angle Spinning (MAS) NMR, X-ray scattering at small (SAXS), and wide (WAXS) angles. In samples where the butylene content is lower-but still sufficient to prevent crystallization in bulk EB-the DSC thermogram presents a broad endothermic transition upon heating from 221 to 300 K. TD NMR, supported by WAXS and dielectric spectroscopy measurements, probed the dynamic phenomena of EB during this transition. The results suggest the existence of a rotator phase for the EB block below room temperature, as a result of nanoconfinement.
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