Silicone Surface Amination Without Oxidation Pretreatment
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Solution Overview
Problem
Silicone surfaces are prone to bacterial and fungal colonization and biofilm formation due to their hydrophobic nature, posing issues in medical and food applications, and existing surface modification methods, such as plasma treatment, are cumbersome and require additional steps.
Innovation Solution
A method to introduce amino groups on silicone surfaces without prior oxidation, using reagents containing amino groups and nucleophilic groups, allowing for further modification without pre-treatment with oxidizing agents like ozone or plasma.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If plasma treatment or oxidation is used to activate silicone surface, then surface can be modified to introduce reactive groups, but the process becomes cumbersome and requires additional steps
Solution Approach 1:
The invention extracts and utilizes the naturally present water groups on the silicone surface as reactive sites, eliminating the need for plasma treatment or oxidation steps. By directly reacting with these pre-existing groups, the process removes unnecessary intermediate steps while maintaining surface modifiability.
Solution Approach 2:
The silicone surface serves itself by utilizing its own naturally present water groups as reactive sites for modification. This self-service approach eliminates the need for external activation methods like plasma or oxidation, simplifying the overall process while maintaining versatility.
2Reliability
If hydrophobic silicone surface is used, then chemical stability is maintained, but bacterial and fungal colonization and biofilm formation occur
Solution Approach 1:
The invention applies local quality modification by introducing hydrophilic amino groups specifically at the surface level while maintaining the bulk hydrophobic silicone matrix. This creates a dual-character system where the surface is hydrophilic for microbial resistance and the bulk remains chemically stable and hydrophobic.
Solution Approach 2:
The invention creates a composite surface structure combining silicone with amino-functional groups. This composite approach allows the surface to exhibit different properties from the bulk material, providing both chemical stability and microbial resistance through the integrated functional groups.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates simpler and more efficient surface modification of silicone, enabling covalent attachment of desired moieties and reducing biofilm formation, with the potential for stable coatings and functionalization.
Implementation Method 1
The silicone surface can then be coated by using the nucleophilic groups on the surface to initiate the polymerization of monomeric building blocks or by reacting with electrophilic moieties on a polymer or other compound used for the coating or by reacting them with a crosslinker and then reacting with a electrophilic moieties on a polymer or other compound used for the coating. Thus, a stable coating is obtained, where a polymer coating is covalently attached to the surface.
Data Source
AI summary
A method for modifying a silicone surface to introduce amino groups thereon, which can be further reacted to introduce desired substituents and activities. The method comprises treating the silicone elastomer surface with a substance that is selected from a molecule that contains at least one primary or secondary amino group and at least one further nucleophilic group selected from OH, SH COOH, NH2, amide, and NHR where R is alkyl; or a silanization reagent with the formula Si—(OR1)(OR2)(OR3)R5NHR4 where groups R1,R2,R3 are independently selected from straight or branched alkyl or alkylene and preferably methyl or ethyl, R5 is a straight or branched alkyl or alkylene, and R4 is H or an organic group. Advantageously, the surface does not need to be pre-treated with oxidizing agent such as ozone, hydrogen peroxide or plasma treatment prior to the treating step of the invention.