Dendronized hydroxypropyl cellulose: synthesis and characterization of biobased nanoobjects

Area of Science:

• Polymer Chemistry
• Materials Science
• Biomaterials

Background:

• Cellulose is a renewable resource with potential for creating advanced polymers.
• Dendronized polymers offer complex architectures and versatile functionalization.
• Synthesizing high-molecular-weight polymers from biobased materials is a key challenge.

Purpose of the Study:

• To synthesize dendronized polymers using a cellulose backbone and functional dendrons.
• To investigate the effect of dendron generation on polymer properties.
• To explore the surface morphology and conformational behavior of these polymers.

Main Methods:

• Synthesis of dendronized polymers by grafting dendrons onto a hydroxypropyl cellulose backbone.
• Characterization using Nuclear Magnetic Resonance (NMR) spectroscopy and Fourier-Transform Infrared (FT-IR) spectroscopy.
• Analysis of molecular weight using Size Exclusion Chromatography (SEC) and surface morphology using Atomic Force Microscopy (AFM).

Main Results:

• Dendronized polymers with generations one to three were successfully synthesized.
• Polystyrene-equivalent molecular weight increased up to the second generation (Mn = 50 kg mol(-1)).
• Dendronized polymers exhibited nanometer-scale dimensions, with elongated conformations on graphite surfaces when functionalized with alkyl chains.

Conclusions:

• Dendronized polymers based on cellulose can be synthesized with controlled molecular weights and versatile end-group functionalization.
• The molecular weight and conformational properties are influenced by dendron generation and end-group modification.
• These biobased dendronized polymers show promise for applications requiring complex molecular architectures and tunable properties.