Polypropylene crystallization at an alumina interface using single walled carbon nanotubes

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Interfaces critically influence composite material performance.
• Improving interfacial interactions is key to enhancing mechanical, thermal, and electrical properties.

Purpose of the Study:

• To develop a novel method for improving interfacial interaction in polypropylene-alumina composites.
• To utilize single-walled carbon nanotubes (SWNTs) as nucleating agents for lamellar crystal growth at the interface.

Main Methods:

• Macroscopic alumina substrates were used to optimize crystallization parameters and study crystal growth kinetics.
• Single-walled carbon nanotubes (SWNTs) were adsorbed onto the interface via Van der Waals interactions.
• Isothermal solution processing techniques were employed to grow lamellar crystals, followed by Avrami analysis and scanning electron microscopy (SEM) for structural confirmation (shish-kebab structures).

Main Results:

• Confirmed one-dimensional transcrystalline growth of lamellar crystals nucleated by SWNTs.
• Identified shish-kebab structures at the SWNT-polypropylene interface using SEM.
• Successfully created uniformly coated alumina platelets with improved interfacial properties using optimized crystallization parameters.

Conclusions:

• The developed method effectively enhances the interphase of semicrystalline polymer-ceramic composites.
• This approach shows significant promise for achieving superior material properties in advanced composites.
• SWNTs serve as effective nucleating agents for controlled crystal growth at polymer-ceramic interfaces.