Dynamics of glass-forming di-n-butyl phthalate as studied by NMR.
Spin-lattice relaxation times T1 and nuclear Overhauser effect (NOE) enhancement factors for the individual ring carbons in di-n-butyl phthalate (DBF) show that the reorientational correlation function corresponding to the global dynamics in supercooled liquid can be described by a Davidson-Cole distribution. Measurements of proton spin-lattice relaxation times T1 and T1p, as well as 1H NMR spectra at temperatures below the glass transition temperature, Tg, reveal that the same distribution holds also for description of local dynamics in glassy DBF. The activation parameters of the motions detected are derived.
Szcześniak
E
E
Institute of Physics, A. Mickiewicz University, Poznań, Poland.
Głowinkowski
S
S
Suchański
W
W
Jurga
S
S
D002247:Carbon Isotopes; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003080:Cold Temperature; D003993:Dibutyl Phthalate / Q000737:chemistry*; D004578:Electron Spin Resonance Spectroscopy; D005898:Glass / Q000737:chemistry*; D006859:Hydrogen; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D011522:Protons
D002247:Carbon Isotopes; D011522:Protons; D003993:Dibutyl Phthalate; D006859:Hydrogen