Improving Surface Functionality, Hydrophilicity, and Interfacial Adhesion Properties of High-Density Polyethylene...

Area of Science:

• Materials Science
• Polymer Chemistry
• Surface Science

Background:

• Polyolefins like HDPE have limited use in advanced technologies due to poor surface energy and adhesion.
• Enhancing surface functionality is crucial for expanding polyolefin applications.

Purpose of the Study:

• To improve the surface functionality, hydrophilicity, and adhesion of high-density polyethylene (HDPE).
• To explore the use of transition metals and inorganic peroxides for HDPE surface modification.

Main Methods:

• Investigated nine combinations of transition metals and peroxides for HDPE surface treatment.
• Utilized Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and contact angle measurements for surface analysis.
• Assessed interfacial adhesion using pull-off strength tests (ASTM D54541).

Main Results:

• The combination of Cobalt(II) and peroxymonosulfate (PMS) was most effective, followed by Ruthenium(III) and PMS.
• Surface treatment introduced hydroxyl, carbonyl, and carboxylic acid groups, increasing hydrophilicity (contact angle reduced from 94.31° to 51.95°).
• Adhesion strength to epoxy coating increased by 193% after 20 minutes of Co(II)/PMS treatment.

Conclusions:

• Transition metal/peroxide treatment, particularly Co(II)/PMS, effectively enhances HDPE surface functionality, hydrophilicity, and adhesion.
• The method introduces sulfate radicals, improving properties without harsh chemicals or lengthy processes.
• This approach can broaden polyolefin applications in coatings, battery separators, and sensors.