Modification of Polyhydroxyalkanoates Polymer Films Surface of Various Compositions by Laser Processing

Area of Science:

• Polymer Science
• Biomaterials Engineering
• Surface Science

Background:

• Polyhydroxyalkanoates (PHAs) are biodegradable polymers with potential applications in various fields.
• Surface modification is crucial for tailoring the properties of PHA films for specific applications.
• Understanding the impact of different laser treatment modes on PHA surfaces is essential for material development.

Purpose of the Study:

• To investigate the effects of CO2 laser surface modification on various PHA compositions.
• To compare the outcomes of continuous and quasi-pulsed laser radiation modes on PHA film properties.
• To evaluate the influence of laser treatment on fibroblast adhesion and growth on PHA surfaces.

Main Methods:

• Solvent casting of PHA films with varying monomer compositions (P(3HB), 3HB, 3HV, 4HB, 3HHx).
• Surface modification using a CO2 laser in continuous and quasi-pulsed modes.
• Characterization using SEM, AFM, contact angle measurements, and fibroblast cell culture (NIH 3T3).

Main Results:

• Continuous laser mode created melted grooves, decreasing roughness and increasing water contact angle.
• Quasi-pulsed laser mode generated holes with less melted area, resulting in 20% lower surface area modification.
• Fibroblast growth was 1.5-2.0 times higher on quasi-pulsed treated films, indicating mode-dependent biocompatibility.
• Surface morphology and properties were significantly influenced by the laser treatment mode, more so than PHA composition.

Conclusions:

• Laser surface modification offers a method for targeted control over PHA film properties.
• The quasi-pulsed laser mode shows superior potential for enhancing cell adhesion and proliferation on PHA films.
• These findings contribute to the development of advanced functional biodegradable polymeric materials.