Synthesis, Structure, and Characteristics of Hyperbranched Polyterpene Alcohols
| Autor: | Toyoji Kakuchi, Yuki Kinugawa, Toshifumi Satoh, Masaki Tamaki, Yoshikazu Kitajyo, Ryosuke Sakai |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
chemistry.chemical_classification
Polymers and Plastics Chemistry Organic Chemistry Size-exclusion chromatography Cationic polymerization Multiangle light scattering Epoxide Ether Polymer Ring-opening polymerization Inorganic Chemistry chemistry.chemical_compound Polymer chemistry Materials Chemistry Boron trifluoride |
| Zdroj: | Macromolecules. 41:5265-5271 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma800851t |
| Popis: | A novel series of bio-based hyperbranched polymers, i.e., hyperbranched polyterpene alcohols, were prepared by the cationic ring-opening polymerizations of citronellol oxide (1) and nopol epoxide (2) using boron trifluoride diethyl etherate (BF3·OEt2) as the catalyst. The polymerizations of 1 and 2 homogeneously proceeded without gelation to produce organic solvent-soluble polymers (poly-1 and poly-2, respectively). The absolute weight-average molecular weights (Mw,MALLS), which were measured by a multiangle laser light scattering instrument (MALLS), were 3700−6200 g mol−1 for poly-1 and 9000−20 000 g mol−1 for poly-2, which were ca. 1.4−4.8 times greater than the relative molecular weights (Mw,SEC) measured by size exclusion chromatography (SEC). The intrinsic viscosities ([η]) of these polymers were very low in the range of 8.5−10.1 mL g−1 for poly-1 and 5.9−9.5 mL g−1 for poly-2. The Mark−Houwink−Sakurada exponent α was calculated to be 0.32−0.40 for poly-1 and 0.25−0.35 for poly-2. These results of th... |
| Databáze: | OpenAIRE |
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