Hi, I coated (ethylmathacrylate-co-bezonephenol methacrylate) on the Si-wafer and cross-linked using UV(365 nm) for different time 5 min, 10 min, 1 h. It is supposed to uncross-linked polymer to be washed off completely. But, the polymer with 1 h UV it was not washed off completely with Toluene overnight. The polymer with 5 min was washed off mostly and small dots remains on the surface when I used toluene. My question is how can I remove un-crosslinked polymer from the surface.
Best,
Bahareh Kheilnezhad To remove un-crosslinked polymer from a surface, consider using solvent-based approaches, mechanical methods, thermal treatment, and chemical degradation approach.
Toluene is a common solvent for removing organic materials, but other organic solvents like acetone, ethyl acetate, or chloroform may be more effective. Soak the coated Si-wafer in the solvent for an extended period to dissolve the polymer. Use a soft brush or cotton swab to gently scrub the surface, or use ultrasonic cleaning to dislodge the polymer.
- Ismagilova, L. Z., Boreiko, N. P., & Trifonova, O. M. (2012). Cleaning of production equipment to remove polymer accretions by chemical breakdown. International Polymer Science and Technology, 39(2), 23-26.
- Cseri, L., Razali, M., Pogany, P., & Szekely, G. (2018). Organic solvents in sustainable synthesis and engineering. In Green chemistry (pp. 513-553). Elsevier.
- Mainkar, P., Ray, A., & Chandrasekhar, S. (2024). SOLVENTS: From Past to Present. ACS omega.
Dear all, the reason is that crosslinking density increases with duration and dose of radiation. As far as crosslinking density is high, the uncrosslinked portion find it difficult to diffuse out the crosslinked one. So my suggestion is to select the best solvent for the acrylate copolymer in question, and to give as much time as you can for swelling to facilitate extraction of the linear chains. My Regards
Bahareh Kheilnezhad , try cleaning with organic solvents and then remove the oxide layer with diluted hydrofluoric acid - HF em H2O (DI) 1:10 (v,v).
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