Amphiphilic block and statistical copolymers with pendant glucose residues: Controlled synthesis by living cationic polymerization and the effect of copolymer architecture on their properties
✍ Scribed by Kenji Yamada; Masahiko Minoda; Takeshi Fukuda; Takeaki Miyamoto
- Publisher
- John Wiley and Sons
- Year
- 2001
- Tongue
- English
- Weight
- 230 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0887-624X
No coin nor oath required. For personal study only.
✦ Synopsis
Amphiphilic block and statistical copolymers of vinyl ethers (VEs) with pendant glucose residues were synthesized by the living cationic polymerization of isobutyl VE (IBVE) and a VE carrying 1,2:5,6-di-O-isopropylidene-D-glucose (IpGlcVE), followed by deprotection. The block copolymer was prepared by a two-stage sequential block copolymerization, whereas the statistical copolymer was obtained by the copolymerization of a mixture of the two monomers. The monomer reactivity ratios estimated with the statistical copolymerization were r 1 (IBVE) ϭ 1.65 and r 2 (IpGlcVE) ϭ 1.15. The obtained statistical copolymers were nearly uniform with the comonomer composition along the main chain. Both the block and statistical copolymers had narrow molecular weight distributions (weight-average molecular weight/number-average molecular weight ϳ 1.1). Gel permeation chromatography, static light scattering, and spin-lattice relaxation time measurements in a selective solvent revealed that the block copolymer formed multimolecular micelles, possibly with a hydrophobic poly(IBVE) core and a glucose-carrying poly(VE) shell, whereas the statistical copolymer with nearly the same molecular weight and segment composition was molecularly dispersed in solution. The surface properties of the solvent-cast films of the block and statistical copolymer were also investigated with the contact-angle measurement.