Study of polymer particles suspensions for electrophoretic deposition

Area of Science:

• Polymer science
• Materials science
• Surface chemistry

Background:

• Electrophoretic deposition (EPD) is a promising technique for polymer coatings.
• Standard Derjaguin-Landau-Verwey-Overbeek (DLVO) theory may not suffice for all polymer particle suspensions.
• Achieving high-quality polymer deposits often requires tailored suspension stabilization.

Purpose of the Study:

• To investigate the necessity of additives for successful EPD of poly(ether ether ketone) (PEEK) and poly(tetrafluoroethylene) (PTFE).
• To demonstrate the codeposition of PEEK and PTFE using optimized EPD conditions.
• To evaluate the efficiency and characteristics of the resulting polymer deposits.

Main Methods:

• Utilized electrophoretic deposition (EPD) for polymer particle coating.
• Employed citrate anions as a dispersant for PEEK suspensions.
• Applied polyvinylpyrrolidone (PVP) for steric stabilization of PTFE suspensions.
• Analyzed deposit efficiency using differential scanning calorimetry (DSC) with controlled thermal cycling.

Main Results:

• Successful EPD of PEEK and PTFE was achieved by incorporating specific additives.
• Citrate anions facilitated PEEK particle dispersion, while PVP provided steric stabilization for PTFE.
• Codeposition of PEEK and PTFE was successfully demonstrated.
• Differential scanning calorimetry confirmed the efficiency of the EPD process and allowed evaluation of polymer crystallinity.

Conclusions:

• Additives are crucial for obtaining high-quality electrophoretic deposits of PEEK and PTFE.
• Tailored suspension stabilization strategies are necessary for effective EPD of specific polymers.
• The study highlights the importance of particle characteristics and suspension chemistry in EPD processes.
• The developed method allows for the codeposition of different polymers, expanding EPD applications.