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<p>This study presents a spectrophotometric method for estimating the film thickness of polymer coatings. Four polymers Polyvinyl alcohol (PVA), Polyethylene glycol (PEG), Polyacrylamide (PAM), and Polyvinyl acetate (PVAC) were prepared in ten different concentrations (20–110 g/dm<sup>3</sup>) and deposited onto glass slides by drop casting. Absorbance and transmittance were measured over a wavelength range of 340–540 nm using a UV–VIS spectrophotometer, and optical constants were calculated to estimate film thickness. Results showed that film thickness decreased with increasing concentration for PVA (2.90 to 0.25 nm) and PVAC (4.97 to 4.12 nm), while PEG (2.07 to 6.25 nm) and PAM (1.18 to 8.86 nm) exhibited increasing trends. Surface free energy decreased with increasing film thickness across all polymers, with maximum values of ~ 57.51 mJ/m<sup>2</sup> and minimum values of ~ 41.05 mJ/m<sup>2</sup>. Contact angle measurements revealed that PVA and PAM became more hydrophobic with thicker films, whereas PEG and PVAC showed increased hydrophilicity. These findings demonstrate that spectrophotometry can provide a low-cost, non-destructive approach to estimating polymer film thickness and related surface properties. The method is suitable for rapid characterization in materials science, coatings engineering, and surface modification studies.</p>

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Estimation of film thickness of a polymer using spectrophotometric data

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月11日

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  • Calistus Princewill Odeh,
  • Anthonia Ekene Ilechukwu,
  • John Chikaelo Okeke,
  • Peter Okechukwu Chikelu,
  • Augustine Uzodinma Madumere

摘要

This study presents a spectrophotometric method for estimating the film thickness of polymer coatings. Four polymers Polyvinyl alcohol (PVA), Polyethylene glycol (PEG), Polyacrylamide (PAM), and Polyvinyl acetate (PVAC) were prepared in ten different concentrations (20–110 g/dm3) and deposited onto glass slides by drop casting. Absorbance and transmittance were measured over a wavelength range of 340–540 nm using a UV–VIS spectrophotometer, and optical constants were calculated to estimate film thickness. Results showed that film thickness decreased with increasing concentration for PVA (2.90 to 0.25 nm) and PVAC (4.97 to 4.12 nm), while PEG (2.07 to 6.25 nm) and PAM (1.18 to 8.86 nm) exhibited increasing trends. Surface free energy decreased with increasing film thickness across all polymers, with maximum values of ~ 57.51 mJ/m2 and minimum values of ~ 41.05 mJ/m2. Contact angle measurements revealed that PVA and PAM became more hydrophobic with thicker films, whereas PEG and PVAC showed increased hydrophilicity. These findings demonstrate that spectrophotometry can provide a low-cost, non-destructive approach to estimating polymer film thickness and related surface properties. The method is suitable for rapid characterization in materials science, coatings engineering, and surface modification studies.