期刊
POLYMERS
卷 10, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/polym10060655
关键词
block copolymers; polystyrene-b-poly (ethylene-co-butylene)-b-polystyrene; X-ray diffraction; C-13 Magic Angle Spinning NMR; H-1 Time Domain NMR; dielectric spectroscopy; rotator phase; mesophase
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 lowerbut still sufficient to prevent crystallization in bulk EBthe 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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