The permeability of a disazothiophene dye solute in polymer matrices above the glass transition

✍ Scribed by A.T. Slark; J.E. Fox

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 690 KB
• Volume: 38
• Category: Article
• ISSN: 0032-3861
• DOI: 10.1016/s0032-3861(96)00867-1

✦ Synopsis

The permeability of a functionalized dye solute in various amorphous polymers above the glass transition temperature has been investigated using dye diffusion thermal transfer printing. A disazothiophene dye molecule was transferred from a constant dye-donor polymer matrix to a variety of dye-acceptor polymer matrices. All dye-acceptor polymers were amorphous, but their chemical structures, glass transition temperatures and solubility behaviours were modified. Dye transfer during a constant print cycle time (i.e. a constant temperature profile) was found to depend on both the diffusivity and the solubility of the solute. Using the solution-diffusion model of permeability as a starting point, equations were developed relating solute permeability to structural characteristics of the components. An excellent correlation has been made for solute permeability as a function of polymer Tg and dye-polymer affinity as defined by solubility parameter differences.