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| DOI | Trouver le DOI : https://doi.org/10.1021/acs.macromol.7b01511 |
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| Auteur | Rechercher : Jeong, Youncheol; Rechercher : Jin, Ye; Rechercher : Chang, Taihyun; Rechercher : Uhlik, Filip; Rechercher : Roovers, Jacques1 |
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| Affiliation | - Conseil national de recherches du Canada
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| Format | Texte, Article |
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| Résumé | The intrinsic viscosity of cyclic polystyrenes (C-PS) and linear polystyrenes (L-PS) with molecular weight (MW) ranging from 16K to 370K was measured in THF using size exclusion chromatography coupled with a triple detection system. The C-PS samples were prepared by a ring-closure reaction of telechelic linear precursor synthesized by anionic polymerization. As-synthesized C-PS samples after the ring-closure reaction contain various byproducts, and they were fractionated by liquid chromatography at the critical condition to obtain highly pure C-PS. While the intrinsic viscosity of L-PS agrees well with the literature data, C-PS shows significantly lower value than the literature values. The Mark–Houwink exponent of C-PS is 0.67, somewhat lower than 0.70 for L-PS in the good solvent over the MW range examined. Therefore, the ratio of the intrinsic viscosity of C-PS to L-PS (g′ = [η]C/[η]L) in THF is not MW independent but decreases as MW increases (0.63 ≥ [η]C/[η]L ≥ 0.57). The trend of intrinsic viscosity agrees well with the computer simulation result. The discrepancy in [η]C from the literature values can largely be attributed to the contamination of linear byproducts in the earlier studies. |
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| Date de publication | 2017-09-25 |
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| Maison d’édition | American Chemical Society |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro NPARC | 23003137 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 7cac559f-63d0-4841-a634-495d432db2f3 |
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| Enregistrement créé | 2018-04-27 |
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| Enregistrement modifié | 2020-05-30 |
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