Two Methods for Polysiloxane Modification

Method 1: Modification of Water-Based Polyurethane with Organosilicon

In this study, a modification method for water-based polyurethane using aminoethylaminopropyl polydimethylsiloxane (CAE-PS), 2,4-toluene diisoacrylate (TOI), polypropylene glycol (NZOO), and dihydroxymethylpropionic acid (DMPA) was investigated. The modification resulted in an increase in the glass transition temperature for both the hard and soft segments of the polyurethane. Notably, the increase was more pronounced in the hard segment than in the soft segment.

The organosilicon was incorporated into the side chain of the polyurethane hard segment, having minimal impact on the molecular structure of the soft segment. As a result, the glass transition temperature of the soft segment was not significantly affected. The introduction of organosilicon-NH led to the formation of hydrogen bonds, improving the microscopic phase separation between the soft and hard segments. This enhancement resulted in a more perfect phase separation, leading to a significant increase in the glass transition temperature of the hard segment.

Method 2: Amino Straight-Chain Modification

Amino straight-chain modification involves attaching amino groups to both ends of siloxane and embedding the siloxane into the main chain of polyurethane through an amino group reaction. The terminal oligomers were copolymerized into amino silicone oil-modified polyurethane coatings. These modified coatings showed significantly improved anti-corrosion properties on copper, as demonstrated in salt spray experiments.

Furthermore, block copolymers prepared with aminopropyl-terminated PDMS/MDUBD were used as separation membranes for ethanol/water mixtures. These membranes allowed only ethanol to pass through, indicating their potential as selective separation materials. The separation coefficient was found to be related to the PDMS block's size and content, suggesting that the performance after modification is influenced by the silicone content and chain segment length.

In summary, the two modification methods of polysiloxane described in this study offer promising avenues for enhancing the properties and performance of various materials.

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