Characterization of Modified PVDF Membranes Using Fourier Transform Infrared and Raman Microscopy and Infrared...

Area of Science:

• Polymer Science
• Materials Chemistry
• Analytical Chemistry

Background:

• Polymer materials like poly(vinylidene fluoride) (PVDF) are crucial in various scientific fields.
• Current surface characterization methods struggle to simultaneously assess diverse properties like morphology and chemical composition.
• Modified PVDF membranes present analytical challenges due to thermal instability and mechanical vulnerability.

Purpose of the Study:

• To introduce and demonstrate the capabilities of infrared scattering scanning near-field optical microscopy (IR-sSNOM) for comprehensive polymer membrane characterization.
• To overcome the limitations of existing techniques in simultaneously measuring topographical, mechanical, and chemical properties.
• To analyze modified PVDF membranes with specific chemical modifications.

Main Methods:

• Utilized Fourier transform infrared (FTIR) microscopy, IR-sSNOM, and Raman microscopy.
• Investigated four types of PVDF membranes modified with specific chemical agents.
• Carefully selected experimental parameters to address the thermal instability and mechanical vulnerability of the samples.

Main Results:

• Successfully characterized modified PVDF membranes, obtaining insights into morphological and chemical homogeneity.
• Confirmed the presence of modifying side chains using FTIR microscopy.
• Revealed the distribution of crystalline phases via Raman spectral mapping.
• IR-sSNOM identified chemically diverse aggregates on membrane surfaces with nanometer-scale resolution.

Conclusions:

• IR-sSNOM offers a powerful tool for simultaneous topographical, mechanical, and chemical analysis of challenging polymer materials.
• The combined approach provides valuable insights into polymer composition and structure at the nano- and microscale.
• This methodology can be extended to similar thermally sensitive polymeric samples, enhancing materials characterization.