Dynamic Evolution in PVPh/PEO Blend Studied by Solid-State NMR
writer：Yongjin Peng, Pingchuan Sun,* Baohui Li*
keywords：solid-state NMR, polymer blend, dynamics, slow motion
source：期刊
specific source：Chinese Journal of Magnetic Resonance 2016, 33, in press
Issue time：2016年
13C CODEX variable-temperature solid-state NMR (SSNMR) technique was used to investigate the evolution of segmental dynamics in PVPh/PEO polymer blend within a wide range of temperature. It was found that the glass transition begins with the presence of remarkable slow motions of both the PVPh backbone segments and side groups, and ends when the CODEX signal intensity of segmental slow motion reaches maximum. SSNMR reveals at the molecular level that the onset and endpoint of the conventional calorimetric glass transition are closely associated with the evolution of slow motions in this polymer blend.