Dendronized Hydroxypropyl Cellulose: Synthesis and Characterization of Biobased Nanoobjects
2007 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 8, no 12, 3815-3822 p.Article in journal (Refereed) Published
Dendronized polymers containing a cellulose backbone have been synthesized with the aim of producing complex molecules with versatile functionalization possibilites and high molecular weight from biobased starting materials. The dendronized polymers were built by attaching premade acetonide-protected 2,2-bis(methylol)propionic acid functional dendrons of generation one to three to a hydroxypropyl cellulose backbone. Deprotection or functionalization of the end groups of the first generation dendronized polymer to hydroxyl groups and long alkyl chains was performed, respectively. The chemical structures of the dendronized polymers were confirmed through analysis using H-1 NMR and FT-IR spectroscopies. From SEC analysis, the dendronized polymers were found to have an increasing polystyrene-equivalent molecular weight up to the second generation (M-n = 50 kg mol(-1)), whereas the polystyrene-equivalent molecular weight for the third generation was lower than for the second, although the same grafting density was obtained from H-1 NMR spectroscopy for the second and third generations. Tapping-mode atomic force microscopy was used to characterize the properties of the dendronized polymers in the dry state, exploring both the effect of the polar substrate mica and the less polar substrate highly oriented pyrolytic graphite (HOPG). It was found that the molecules were in the size range of tens of nanometers and that they were apt to undertake a more elongated conformation on the HOPG surfaces when long alkyl chains were attached as the dendron end-groups.
Place, publisher, year, edition, pages
2007. Vol. 8, no 12, 3815-3822 p.
Characterization; Molecular weight; Molecules; Structure (composition); Synthesis (chemical); Cellulose backbone; Dendronized polymers; Nanoobjects; alkyl group; graphite; hydroxyl group; hydroxypropylcellulose; nanoparticle; polystyrene; propionic acid derivative; article; atomic force microscopy; carbon nuclear magnetic resonance; chemical modification; chemical structure; complex formation; conformational transition; controlled study; dendronization; gel permeation chromatography; infrared spectroscopy; molecular weight; priority journal; proton nuclear magnetic resonance; synthesis; Biocompatible Materials; Cellulose; Nanostructures; Hydroxypropyl Cellulose; Molecular Weight; Synthesis
IdentifiersURN: urn:nbn:se:kth:diva-7709DOI: 10.1021/bm7007394ISI: 000251547600019ScopusID: 2-s2.0-38049034907OAI: oai:DiVA.org:kth-7709DiVA: diva2:12814
QC 201008262007-11-232007-11-232010-08-26Bibliographically approved