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2-Isopropenyl-2-oxazoline: Well-Defined Homopolymers and Block Copolymers via Living Anionic Polymerization.
- Source :
-
Macromolecules . Jan2017, Vol. 50 Issue 1, p54-62. 9p. - Publication Year :
- 2017
-
Abstract
- Poly(2-isopropenyl-2-oxazoline) (PIPOx) has drawn significant attention for numerous applications. However, the successful living anionic polymerization of 2-isopropenyl-2-oxazoline has not been reported previously. Herein, we describe how well-defined PIPOx with quantitative yields, controlled molecular weights from 6800 to over 100,000 g/mol and low polydispersity indices (PDI ≤ 1.17) were synthesized successfully via living anionic polymerization using diphenylmethylpotassium/diethylzinc (DPM-K/Et2Zn) in tetrahydrofuran (THF) at 0 °C. In particular, we report the precise synthesis of well-defined PIPOx with the highest molecular weight ever reported (over 100,000 g/mol) and low PDI of 1.17. The resulting polymers were characterized by ¹H and 13C nuclear magnetic resonance spectroscopy (NMR) along with size exclusion chromatography (SEC). Additionally, the reactivity of living PIPOx was investigated by crossover block copolymerization with styrene (St), 2-vinylpyridine (2VP), and methyl methacrylate (MMA). It was found that the nucleophilicity of living PIPOx is of this order: living PS > living P2VP > living PMMA > living PIPOx. The self-assembly behavior in bulk of PIPOx-b-PS-b-PIPOx triblock copolymers having different block ratios of 10:80:10 and 25:50:25 was studied using transmission electron microscopy (TEM). The formation of spherical and lamellar nanostructures, respectively, was observed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00249297
- Volume :
- 50
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Macromolecules
- Publication Type :
- Academic Journal
- Accession number :
- 120823001
- Full Text :
- https://doi.org/10.1021/acs.macromol.6b02084