Dual Roles of Alkyl Alcohols as Syndiotactic-Specificity-Inducer and Accelerator in the Radical Polymerization of N-Isopropylacrylamide and Some Properties of Syndiotactic Poly(N-isopropylacrylamide)
Hirano, Tomohiro Tokushima University Tokushima University Educator and Researcher Directory KAKEN Search Researchers
Okumura, Yuya Tokushima University
Kitajima, Hiroko Tokushima University
Seno, Makiko Tokushima University
Sato, Tsuneyuki Tokushima University Tokushima University Educator and Researcher Directory
lower critical solution temperature
Effect of simple alkyl alcohol on radical polymerization of N-isopropylacrylamide (NIPAAm) in toluene at low temperatures was investigated. We succeeded in induction of syndiotactic-specificity and acceleration of polymerization reaction at the same time by adding simple alkyl alcohols such as 3-methyl-3-pentanol (3Me3PenOH) into NIPAAm polymerization. The diad syndiotacticity increased with a decrease in temperature and an increase in bulkiness of the added alcohol, and reached up to 71% at –60°C in the presence of 3Me3PenOH. With the aide of NMR analysis, it was revealed that alcohol compounds play dual roles in this polymerization system; alcohol compound coordinating to N-H proton induces the syndiotactic-specificity and that hydrogen-bonded to C=O oxygen accelerates the polymerization reaction. The effect of syndiotacticity on properties of poly(NIPAAm)s was also discussed in some detail.
Journal of Polymer Science Part A : Polymer Chemistry
This is the peer reviewed version of the following article: Hirano, T., Okumura, Y., Kitajima, H., Seno, M. and Sato, T. (2006), Dual roles of alkyl alcohols as syndiotactic‐specificity inducers and accelerators in the radical polymerization of N‐isopropylacrylamide and some properties of syndiotactic poly(N‐isopropylacrylamide). J. Polym. Sci. A Polym. Chem., 44: 4450-4460., which has been published in final form at https://doi.org/10.1002/pola.21546. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
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