Dynamic Evolution in PVPh/PEO Blend Studied by Solid-State NMR

doi:10.11938/cjmr20160202

Abstract

Abstract:

The ¹³C centerband-only-detection-of-exchange (CODEX) variable-temperature solid-state NMR (SSNMR) technique was used to investigate the evolution of segmental dynamics in poly (vinyl phenol) (PVPh)/poly (ethylene oxide) (PEO) polymer blend within a wide range of temperatures. It was found that the glass transition began with the emergence of remarkable slow motions of the PVPh backbone segments, and ended when the CODEX signal intensity of segmental slow motion reached maximum. The SSNMR results revealed, at molecular level, that the onset and endpoint of conventional calorimetric glass transition are closely associated with the evolution of slow motions in this polymer blend.

Key words: solid-state NMR(SSNMR), polymer blend, dynamics, slow motion

CLC Number:

O482.53

PENG Yong-jin, SUN Ping-chuan, LI Bao-hui. Dynamic Evolution in PVPh/PEO Blend Studied by Solid-State NMR[J]. Chinese Journal of Magnetic Resonance, 2016, 33(2): 188-197.

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