Complexation of polyvinyl acetate with iodine

Area of Science:

• Analytical Chemistry
• Polymer Science

Background:

• Polyvinyl acetate (PVAc) is a widely used polymer.
• Accurate quantification of PVAc is essential for quality control and research.
• Existing analytical methods may have limitations in sensitivity or applicability.

Purpose of the Study:

• To develop and validate a spectrophotometric method for quantifying polyvinyl acetate.
• To investigate the complex formation between polyvinyl acetate, iodine, and potassium iodide.
• To determine the sensitivity and linear range of the developed analytical method.

Main Methods:

• Formation of a red complex between polyvinyl acetate and iodine in the presence of potassium iodide.
• Spectrophotometric analysis of the complex at 510 nm using a methanol-water solvent system.
• Determination of calibration curves and limit of detection.

Main Results:

• Linear calibration curves were obtained for polyvinyl acetate concentrations ranging from 25-100 mg/L.
• The method demonstrated a limit of detection of 0.1 mg of polyvinyl acetate in 0.5 mL of the initial sample.
• Replacement of acetate groups with inert groups was found to decrease the method's sensitivity.

Conclusions:

• The developed spectrophotometric method is sensitive and reliable for quantifying polyvinyl acetate.
• The method's performance is influenced by the chemical structure of the polymer, specifically the acetate groups.
• This technique offers a viable option for the analysis of polyvinyl acetate in various applications.