Preparation and characterization of bis-phosphonated polycarbohydrates.

Area of Science:

• Polymer Chemistry
• Materials Science

Background:

• Alginic acid and carboxymethyl cellulose (CMC) are widely used polysaccharides.
• Modification of natural polymers can enhance their properties for advanced applications.

Purpose of the Study:

• To develop a simple and cost-effective method for introducing bis-phosphonic groups onto alginic acid and CMC.
• To characterize the resulting derivatives and evaluate their thermal properties and potential as intumescent materials.

Main Methods:

• A one-pot synthesis strategy was employed.
• Characterization utilized nuclear magnetic resonance (NMR), X-ray photoelectron spectroscopy (XPS), and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR).
• Thermal properties were assessed using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC).

Main Results:

• Successful introduction of bis-phosphonic groups onto alginic acid and CMC was confirmed by spectroscopic analyses.
• The bis-phosphonated derivatives exhibited significant char-forming ability.
• Thermogravimetric analysis and differential scanning calorimetry revealed enhanced thermal stability and char yield.

Conclusions:

• The developed method provides an efficient route to bis-phosphonated alginate and CMC derivatives.
• These novel polycarbohydrate derivatives show promise as effective intumescent materials due to their char-forming capabilities.