T. Imai, T. Satoh, H. Kaga
Apr 9, 2004
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0
Influential Citations
18
Citations
Journal
Macromolecules
Abstract
1,4-Anhydroerythritol (1a) and 1,4-anhydro-l-threitol (1b) were polymerized using trifluoromethanesulfonic acid (CF3SO3H) or fluorosulfonic acid (FSO3H) as a cationic initiator. The polymerizations of 1a and 1b proceeded through a ring-opening reaction with a proton-transfer reaction to produce hyperbranched carbohydrate polymers (2a and 2b) mainly consisting of erythritol and l-threitol units, respectively. The degrees of branching (DB) estimated by the 13C NMR spectra of 2a and 2b were ca. 0.28−0.47. The weight-average molecular weight (Mw,SLS) values (3.2 × 104−5.1 × 105) estimated using static laser light scattering (SLS) of the resulting hyperbranched carbohydrate polymers were significantly higher than the weight-average molecular weight (Mw,SEC) values (1.5 × 103−1.4 × 104) estimated using size exclusion chromatography (SEC). The solution viscosities of 2a and 2b were very low, and the intrinsic viscosities ([η]) of 2a and 2b were in the range from 3.26 × 10-2 to 7.30 × 10-2 dL·g-1. The three-dimen...