A Fluorescent Polyurethane with Covalently Cross-Linked Rhodamine Derivatives

Area of Science:

• Polymer Chemistry
• Materials Science
• Organic Synthesis

Background:

• Polyurethanes (PU) are versatile polymers with diverse applications.
• Incorporating fluorescent moieties can enhance PU properties for specialized uses.
• Rhodamine derivatives (RDs) are known for their fluorescent characteristics.

Purpose of the Study:

• To synthesize novel rhodamine derivatives (RDs) with three reactive hydrogens.
• To covalently cross-link these RDs into a polyurethane (PU) matrix, forming a network structure.
• To investigate the impact of this cross-linking on the fluorescent, mechanical, thermal, and emulsion properties of the resulting PU-RD material.

Main Methods:

• Synthesis and characterization of rhodamine derivatives using FTIR, 1H NMR, and ESI mass spectrometry.
• Covalent cross-linking of RD into a PU matrix to create a network structure.
• Systematic evaluation of fluorescent properties, mechanical strength, thermal stability, and emulsion particle size.

Main Results:

• Successfully synthesized and characterized rhodamine derivatives.
• Fabricated a cross-linked polyurethane-rhodamine derivative (PU-RD) network structure.
• PU-RD materials retained fluorescence, emitting yellow light under UV irradiation.
• Compared to linear PU, PU-RD demonstrated significantly improved mechanical properties and thermal stability due to the network formation.

Conclusions:

• Covalent cross-linking of rhodamine derivatives into a polyurethane matrix effectively creates a fluorescent network material.
• The resulting PU-RD exhibits enhanced mechanical and thermal performance while preserving desirable fluorescent properties.
• This study presents a viable method for developing advanced fluorescent polymer materials with improved structural integrity.