Molecular Dynamics of Semi-Crystalline Poly(3-Hydroxybutyrate) and Poly(3-Hydroxybutyrate-Co-3-Hydroxyvalerate) Studies by Solid-State NMR Spectroscopy

doi:10.11938/cjmr20192718

Abstract

Abstract: Molecular dynamics of semi-crystalline poly(3-hydroxybutyrate) (PHB) and copolymers poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) containing 5 wt.% (PHBV5) and 12 wt.% (PHBV12) 3-hydroxyvalerate monomer was studied with solid-state NMR spectroscopy. Proton spin-lattice relaxation times in the laboratory frame (T₁) and rotating frame (T_1ρ) were measured over the temperature range of 150~370 K. Kubo-Tomita expression fitting to the changes of relaxation times with temperature was used to obtain the molecular dynamics parameters (i.e., E_a and τ₀) in the crystalline and amorphous regions of PHB, PHBV5 and PHBV12. These results yielded molecular-level insights into the structural modification and enhancement of the PHB.

Key words: solid-state NMR, molecular dynamics, poly(3-hydroxybutyrate), poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

CLC Number:

O482.53

XU Guang-yong, DONG Man-yuan, MA Jian-feng, ZHANG Li-min. Molecular Dynamics of Semi-Crystalline Poly(3-Hydroxybutyrate) and Poly(3-Hydroxybutyrate-Co-3-Hydroxyvalerate) Studies by Solid-State NMR Spectroscopy[J]. Chinese Journal of Magnetic Resonance, 2019, 36(4): 544-554.

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