Vulcanization on Polymer Film Surfaces With Elemental Sulfur

Area of Science:

• Materials Science
• Polymer Chemistry
• Surface Chemistry

Background:

• Elemental sulfur is a sustainable feedstock for sulfur-rich polymers.
• Existing sulfur chemistry primarily focuses on bulk polymer synthesis.
• There is a need for methods to modify polymer surfaces with sulfur.

Purpose of the Study:

• To develop a surface vulcanization method for polymer films using molten sulfur.
• To create asymmetric, sulfur-modified polymer structures.
• To explore the application of this technique to polybenzoxazine (PBz) films.

Main Methods:

• Infiltration of molten sulfur into polymer films.
• In situ vulcanization of the infiltrated sulfur within the polymer matrix.
• Characterization using Scanning Electron Microscopy with Energy-Dispersive X-ray (SEM-EDX), X-ray Photoelectron Spectroscopy (XPS), and Fourier Transform Infrared Spectroscopy (FTIR).

Main Results:

• Successful surface vulcanization of polybenzoxazine (PBz) films was achieved.
• An asymmetric structure with a vulcanized layer on the film surface was formed.
• Characterization confirmed the presence of sulfur and crosslinking on the film surface.

Conclusions:

• Surface vulcanization using elemental sulfur is a viable strategy for modifying polymer films.
• This method enables the creation of asymmetric, sulfur-containing materials.
• The developed technique offers a new platform for advanced sulfur-based polymer materials.