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• W2321301632 abstract "A series of hyperbranched polylactides (HB-PLLAs) with different branching densities were prepared by the self-polycondensation of AB2-type macromonomers (degree of polymerization of polylactides (n) = 5.0, 8.4, 19, 29, and 42). The high-molecular-weight HB-PLLAs (Mw = 4.95 × 104–1.47 × 105) were prepared in good yields. Molecular characterizations of the HB-PLLAs were meticulously performed by size-exclusion chromatography at 25 °C using a system equipped with multiangle laser light scattering (SEC-MALS) and 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP) as the eluent. The z-averaged root-mean-square radius of gyrations (⟨S2⟩z1/2) of the HB-PLLAs in HFIP at 25 °C were much smaller than those of the linear PLLA with the corresponding weight-average molecular weight (Mw), supporting the presence of the branched architectures. The Mw dependence of ⟨S2⟩z1/2 of the HB-PLLAs was determined to follow the equations ⟨S2⟩z1/2 (nm) = 2.5 × 10–1Mw0.37 for n = 8.4, ⟨S2⟩z1/2 (nm) = 1.8 × 10–1Mw0.40 for n = 19, ⟨S2⟩z1/2 (nm) = 1.6 × 10–1Mw0.41 for n = 29, and ⟨S2⟩z1/2 (nm) = 1.1 × 10–1Mw0.44 for n = 42 in HFIP at 25 °C. A comparison of the experimental and theoretical results with respect to their dimensional properties indicated that the HB-PLLAs assume randomly branched architectures (i.e., a hyperbranched structure). The DSC and X-ray diffraction measurements suggested that the crystallization was remarkably suppressed by the introduction of the branched architecture." @default.
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• W2321301632 date "2012-10-12" @default.
• W2321301632 modified "2023-09-27" @default.
• W2321301632 title "Synthesis of Hyperbranched Poly(<scp>l</scp>-lactide)s by Self-Polycondensation of AB₂ Macromonomers and Their Structural Characterization by Light Scattering Measurements" @default.
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• W2321301632 doi "https://doi.org/10.1021/ma301021c" @default.
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