Aqueous Amino Silane Modification of E-glass Surfaces

Area of Science:

• Materials Science
• Surface Chemistry

Background:

• Traditional silane coupling agents like epoxy, amino, and methacrylate silanes are widely studied for E-glass surface modification.
• There is a need for alternative surface treatments to enhance E-glass fiber properties.

Purpose of the Study:

• To investigate the surface properties of E-glass fibers treated with novel silanes (gamma-ureidopropyltriethoxy silane and Nbeta(aminoethyl) gamma-aminotrimethoxy silane) and an amino-functional polysiloxane.
• To compare the effects of these novel treatments with conventional silanes.

Main Methods:

• Surface treatment of E-glass fibers using varying concentrations of novel silanes and a polysiloxane.
• Zeta potential measurements to assess surface charge.
• Contact angle measurements or surface energy analysis to determine hydrophobicity.
• Surface analysis techniques to investigate the structure of the deposited layers.

Main Results:

• Ureido silane treatment resulted in zeta potential similar to untreated E-glass, independent of pH.
• Silane concentration influenced E-glass hydrophobicity due to Si-O-Si bond formation.
• Diamino silane created a highly basic surface at higher concentrations.
• Polysiloxane increased hydrophobicity, particularly from basic solutions.
• Surface layer formation (patchy coating with an outer skin) observed at higher concentrations.

Conclusions:

• Novel silanes and a polysiloxane offer alternative surface modification strategies for E-glass fibers.
• The surface properties (zeta potential, hydrophobicity, surface chemistry) can be tuned by the choice of treatment and deposition conditions (pH, concentration).
• These findings provide insights into developing advanced composite materials with tailored interfacial properties.