Hyperbranched Polytetritol by Polymerization of 2,3-Anhydrotetritol

In the NMR spectra of PolylOa and Poly 10b, the characteristic absorption due to the epoxy proton disappeared, indicating that the epoxy group was consumed and that the resulting polymers essentially consisted of tetritol repeating units. Because the ring strains of the oxirane-type monomers of 10a and 10b were larger than those of the tetrahydrofuran-type 

Monomers 10a and 10b have an epoxy and two hydroxy groups in the molecule, so that they are classified as latent AB3-type monomers. The DBs estimated by the NMR spectra of Poly 10a and Poly 10b were 0.47 and 0.45, respectively. Although the DBs of Poly 6a and Poly 6b varied in the range of0.28-0.47, the DBs of Poly 10a and Poly 10b did not change according to the polymerization condition. 

The solution viscosities of Poly 10a and Poly 10b were extremely low, and the [rj]s were in the range of 0.019-0.025 dLg The a value in the Mark-Houwink-Sakurada equation was 0.105. This small value was consistent with a highly branched 

The resulting polytetritols were the hyperbranched glyco-conjugated polymers PolylOa and PolylOb essentially consisting of DL-threitol and erythritol units, respectively, which differed from the hyperbranched polytetritols prepared from 1,4-anhydroerythritol (6a) and 1,4-anhydro-L-threitol (6b). 

4 Hyperbranched Poly(2,5-anhydro-D-glucitol) by Polymerization of ly2 5y6-Dianhydro-D-mannitol 

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