The effect of intermolecular forces on the glass transition of solute-polymer blends

✍ Scribed by A.T. Slark

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 699 KB
• Volume: 38
• Category: Article
• ISSN: 0032-3861
• DOI: 10.1016/s0032-3861(96)00782-3

✦ Synopsis

The effects of dye-polymer interactions on the Tg of dye-polymer blends have been investigated using a disazothiophene dye solute in a variety of polymer structures. The dye was found to decrease the Tg of some polymers (plasticization) while increasing the Tg of others (antiplasticization). The Tg of a dye polymer blend depended on the polymer Tg, the dye solute Tg, their relative concentrations and dye polymer affinity. Increasing dye polymer affinity produced stronger interaction between the dye and polymer, leading to higher Tg of the dye-polymer blend. Excellent correlations were established between Tg enhancement and the dye-polymer solubility parameter match which was used to predict dye-polymer affinity. Solubility parameters indicated that the combination of polar and hydrogen bonding forces controlled the elevation of Tg, since the best correlation was obtained by neglecting dispersion forces.