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Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification

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Published on: April 7, 2017

Antifouling silicones based on surface-modifying additive amphiphiles.

Marc A Rufin¹, Bryan Khai D Ngo¹, Mikayla E Barry¹

¹Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA.

Green Materials

|November 2, 2019

Summary

Poly(ethylene oxide)-based surface modifying additives (SMAs) were tested for silicone coatings. Non-crosslinkable diblock SMAs showed the best initial surface properties and maintained protein resistance after water conditioning.

Keywords:

ANTI-FOULING POLYMERIC MATERIALS SURFACE MODIFICATION

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Published on: February 11, 2020

Area of Science:

Materials Science
Polymer Chemistry
Surface Chemistry

Background:

Surface modifying additives (SMAs) are crucial for enhancing silicone properties like anti-fouling behavior.
Effective SMAs require excellent surface migration and minimal leaching into aqueous environments.
Poly(ethylene oxide) (PEO)-based amphiphiles are promising candidates for SMAs.

Purpose of the Study:

To evaluate the efficacy of various PEO-based SMA amphiphiles in silicone coatings.
To compare the effects of crosslinkability, siloxane tether length, and block architecture (diblock vs. triblock) on SMA performance.
To assess surface restructuring, hydrophilicity, protein resistance, water uptake, and leaching of modified silicone coatings.

Main Methods:

Synthesis and blending of PEO-based SMA amphiphiles into silicone matrices.
Preparation of silicone coatings with different SMAs.
Evaluation of surface properties before and after water conditioning.
Assessment of hydrophilicity, protein resistance, water uptake, and leaching.

Main Results:

All modified silicone coatings showed water-driven surface restructuring.
Non-crosslinkable diblock SMA (m=13) yielded the most hydrophilic surface initially.
After conditioning, all coatings were similarly hydrophilic and protein-resistant, except for PEO8-ODMS-PEO8.
Diblock SMAs were not outperformed by triblock SMAs, even with higher PEO content.
For diblock SMAs, crosslinkability did not significantly affect water uptake or leaching.

Conclusions:

PEO-based diblock SMAs, particularly non-crosslinkable ones, offer effective surface modification for silicones.
The architecture and crosslinkability of SMAs influence their performance in silicone coatings.
These findings provide insights for designing advanced SMAs with improved anti-fouling and stability characteristics.