An investigation of poly (dimethylsiloxane) chain dynamics and order in its inclusion compound with gamma-cyclodextrin by fast-MAS solid-state NMR Spectroscopy

作者：Saalwachter K^*

来源：Macromolecular Rapid Communications, 2002, 23(4): 286-291.

DOI：10.1002/1521-3927(20020301)23:4<286::AID-MARC286>3.0.CO;2-U

• dipolar couplings
• inclusion chemistry
• PDMS
• solid-state NMR
• supramolecular structures

Communication: The dynamics of poly(dimethylsiloxane) in its inclusion compound with gamma-cyclodextrin are elucidated using modem fast-MAS solid-state NMR techniques. Measurements of methyl H-1-H-1 and H-1-C-13 dipolar coupling constants indicate that the polymer undergoes a uniform motion, rendering all methyl groups equivalent. The dynamics of the Si-C bond is characterized by either a dynamic order parameter of S = 0.72, or assuming a stably rotating helical structure, an inclination angle of 73degrees relative to the rotation axis.

• 出版日期2002-3-14