Creating porous tubes by centrifugal forces for soft tissue application.

Area of Science:

• Polymer Chemistry
• Biomaterials Science
• Materials Engineering

Background:

• Poly(2-hydroxyethyl methacrylate) (PHEMA) is a versatile polymer with applications in soft tissue engineering.
• Existing methods for synthesizing tubular structures from PHEMA can be limited in control over morphology and dimensions.

Purpose of the Study:

• To develop a novel method for synthesizing chemically crosslinked PHEMA tubes.
• To investigate the influence of centrifugal forces and formulation chemistry on tube formation and properties.
• To explore the potential of these tubes for soft tissue applications.

Main Methods:

• Initiated monomer solutions of PHEMA were placed in a rotating cylindrical mold.
• Centrifugal forces were applied during polymerization to induce phase separation and tube formation.
• Rotational speed and chemical composition (monomer, initiator, crosslinking agent) were systematically varied.

Main Results:

• PHEMA tubes were successfully synthesized with controlled outer diameters (2.4 mm) and wall thicknesses (40-400 microm).
• Tube wall morphology could be tuned from interconnected polymer/water phases to closed-cell structures.
• Concentric tubes were achieved by optimizing formulations to favor phase separation over gelation.

Conclusions:

• Centrifugal force-assisted polymerization provides a novel route for fabricating PHEMA tubes.
• The technique offers precise control over tube dimensions and morphology.
• Synthesized PHEMA tubes show promise for soft tissue engineering, including nerve guidance channels.