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Attaching Biological Probes to Silica Optical Biosensors Using Silane Coupling Agents
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Probing Covalent Interactions at a Silicone Adhesive/Nylon Interface.

Ting Lin, Yuchen Wu, Elizabeth Santos1

  • 1Dow Performance Silicones, Auburn, Michigan 48611, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 15, 2022
PubMed
Summary
This summary is machine-generated.

Sum frequency generational (SFG) vibrational spectroscopy revealed covalent bonding at buried nylon/silicone interfaces. This technique demonstrated how silane coupling agents enhance adhesion, aiding material design.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Polymer Science

Background:

  • Covalent bonds offer superior interfacial strength and durability compared to noncovalent interactions in adhesives.
  • Probing in situ interfacial reactions, especially at buried interfaces, remains a significant challenge in materials science.
  • Silane coupling agents are crucial for promoting adhesion in silicone elastomers, particularly with substrates like nylon.

Purpose of the Study:

  • To directly examine and analyze interfacial chemical reactions at buried nylon/silicone elastomer interfaces using sum frequency generational (SFG) vibrational spectroscopy.
  • To investigate the molecular mechanisms of adhesion promotion by alkoxysilane coupling agents with varied functionalities (maleic anhydride and epoxy) at the nylon/silicone interface.
  • To demonstrate the capability of SFG spectroscopy in probing buried interfaces and aiding material design.

Main Methods:

  • Sum frequency generational (SFG) vibrational spectroscopy was employed to analyze molecular changes at buried nylon/silicone interfaces.
  • Two alkoxysilane adhesion promoters with maleic anhydride (MAH) and epoxy functionalities were formulated into silicone elastomers.
  • Interfacial reactions between the silane promoters and nylon substrates were studied in situ.

Main Results:

  • SFG spectroscopy provided direct evidence of chemical reactions occurring at the buried nylon/silicone interface.
  • Reactions between the organofunctional groups of the silanes (MAH or epoxy) and the polyamide reactive groups on nylon were confirmed.
  • The presence of both silane additives substantially enhanced the adhesion strength between nylon and the cured silicone elastomer.

Conclusions:

  • SFG vibrational spectroscopy is a powerful technique for analyzing interfacial chemical reactions at buried interfaces.
  • The study elucidated the molecular-level mechanisms by which organo-silanes promote adhesion between silicone and nylon.
  • This approach aids in the rational design and optimization of materials with enhanced interfacial properties.