Effectiveness of silane treatment on absorbable microfibers

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Composite Materials

Background:

• Absorbable crystalline calcium-sodium-metaphosphate (CSM) microfibers are promising biomaterial reinforcements.
• Water-induced degradation and poor interfacial adhesion limit CSM composite performance.
• Silane coupling agents can enhance fiber-matrix interactions and improve composite properties.

Purpose of the Study:

• To investigate the effect of silane pretreatment on CSM microfibers.
• To evaluate the mechanical properties and water resistance of CSM/polymer composites.
• To explore the potential of silane-modified CSM microfibers in different polymer matrices.

Main Methods:

• CSM microfibers were pretreated with trimethoxy-based silane coupling agents.
• Poly(L-lactic acid) (PLLA) and unsaturated polyester thermoset composites were fabricated using treated and untreated CSM microfibers.
• Mechanical properties (e.g., flexural strength, modulus) and wet strength retention were assessed after in vitro exposure.

Main Results:

• Silane pretreatment created a polysiloxane film, protecting CSM fibers from water dissolution.
• PLLA composites with silane-treated CSM showed improved mechanical properties, indicating better adhesion.
• Silane-treated CSM/PLLA composites did not show increased wet strength retention.
• Methacryloxy-silane treated CSM/polyester composites exhibited no decrease in flexural strength and minimal modulus decrease after 7 days of buffered saline exposure.

Conclusions:

• Silane pretreatment enhances interfacial adhesion and mechanical properties of CSM/polymer composites.
• The choice of polymer matrix significantly impacts the water resistance of silane-modified CSM composites.
• Silane-treated CSM microfibers show potential for use in non-degradable polymer matrices requiring enhanced mechanical performance and durability.