Abstract
Binding properties of poly(tetrahydrofuran) (PTHF) to methylated cyclodextrins (CDs) in aqueous solutions were studied by turbidity titration and 1H NMR measurements. PTHF, which has a low solubility in water, was dissolved in water on addition of 2,6-di-O-methyl-β-CD (DM-β-CD) and DM-α-CD. 2,3,6-tri-O-methyl-β-CD (TM-β-CD) and TM-α-CD did not solubilize PTHF. When PTHF was mixed with aqueous solutions of DM-β-CD and TM-β-CD, the inclusion complexes crystallized after several days. 1,4-Butanediol (monomer model) and PTHF (Mw = 250) did not form crystalline complexes with methylated CDs. The yields of the complexes of PTHF with methylated β-CDs increased with increasing molecular weight of PTHF and reached a maximum at about Mw = 1000. The complexes were characterized by 1H NMR, solid-state 13C NMR, powder X-ray, and FT-IR measurements.
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