Nitrates of Synthetic Cellulose

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Global demand for alternative cellulose sources drives research into synthetic cellulose.
• Current practices lack synthetic cellulose-derived cellulose nitrates (NCs), highlighting a research gap.

Purpose of the Study:

• To synthesize cellulose nitrate (NC) using a novel synthetic cellulose (SC) precursor.
• To characterize the properties of SC and SC-derived NC.
• To investigate the structural and thermal transformations during SC nitration.

Main Methods:

• Synthetic cellulose (SC) prepared via electropolymerization of glucose with a tungsten-vanadium heteropolyacid catalyst.
• Nitration of SC to produce SC-derived NC.
• Characterization using Scanning Electron Microscopy (SEM), Fourier-Transform Infrared (FT-IR) spectroscopy, X-ray Diffraction (XRD), and Thermogravimetric/Differential Thermal Analysis (TGA/DTA).

Main Results:

• SC-derived NC synthesized with 138% actual yield, featuring high nitrogen content (11.83%), viscosity (198 mPa·s), solubility (91%), and low ash (0.05%).
• SEM revealed distinct morphologies for SC (flat, curly fibers) and SC-derived NC (cylindrical fibers).
• FT-IR confirmed characteristic cellulose and nitrate ester functional groups. XRD showed SC is cellulose Iβ, which amorphizes upon nitration (CrI from 81-86% to 17%).
• TGA/DTA indicated SC decomposes at 374 °C, while SC-derived NC is thermostable, decomposing at 200 °C with a high specific heat of decomposition (7.74 kJ/g).

Conclusions:

• Successful synthesis of NC from SC demonstrates a novel pathway for cellulose functionalization.
• SC-derived NC exhibits promising properties, including thermal stability and high decomposition energy.
• This research expands the scope of cellulose nitration and provides a viable alternative to conventional cellulose sources.