Dip-dip-dry: solvent induced surface recrystallization for polymer modification
Dip-dip-dry (DDD) is a scalable surface modification technique enhancing polymer surfaces with superhydrophobic properties, effective even with dust. This method uses solvent and non-solvent immersion to alter polymer microstructures, applicable to various substrates.
Overview
Dip-dip-dry (DDD) is an innovative surface modification technique developed to enhance the properties of polymer surfaces. By immersing a polymer substrate first in a compatible solvent and then in a non-solvent coagulant, DDD induces partial surface dissolution and recrystallization, resulting in microstructures with superhydrophobic properties. This method maintains performance even in the presence of dust and contaminants, making it ideal for applications in environments with potential exposure to pollutants. DDD is readily scalable for industrial applications and has been demonstrated on various polymers including PLA, nylon, and polyethylene.
Technical specifications
Process Details:
- Initial immersion of polymer in a compatible solvent (e.g., acetone for PLA).
- Subsequent immersion in a non-solvent coagulant (e.g., water) to halt dissolution.
- Optional thermal pretreatment in an ethylene glycol bath based on polymer crystallinity.
- Applicable to both batch and continuous (roll-to-roll) processing methods.
- Versatile across different polymer substrates with the proper solvent-coagulant pair.
Applications:
- Enhancing agricultural polymer exclusion nets.
- Creating self-cleaning, dust-repellent surfaces.
Technology readiness level
The DDD technique is currently at Technology Readiness Level 4, having been validated in laboratory settings and on pilot scales. Future steps include further validation on partner-specific polyolefin substrates and scaling up the process for industrial applications.
About École Polytechnique de Montréal
Polytechnique Montréal is a large public engineering school affiliated with Université de Montréal, combining rigorous academic programs with applied research at scale. Industry engagement is built into the model through structured co-op and internship pathways, on‑campus collaboration spaces, and longstanding partnerships with regional and global firms. Its location within a major research university ecosystem—and near teaching hospitals and startup hubs—helps companies move from prototype to validation and deployment. Research is supported by competitive federal funding from agencies such as NSERC and the Canada Foundation for Innovation, alongside provincial and industry investment. A dedicated technology transfer office assists with IP strategy, licensing, and startup formation, with streamlined agreements for sponsored research.
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