Shape-Memory Polymers Based on Castor Oil and Lignin Sulphonate Synthesized from Waterborne Dispersion

Samy A. Madbouly

Research output: Contribution to conferencePaperpeer-review


Aqueous polyurethane dispersions based on castor oil and lignin sulphonate (LS) were successfully synthesized in homogenous solution with no organic volatile compounds and excellent dispersion stability. Transparent thin films of PU-LS with different LS contents were obtained via solution (dispersion) cast technique. The glass transition temperatures (Tgs) of the PU-LS films were evaluated from the dynamic mechanical analysis (DMA) at 1 Hz and 2 °C/min heating rate. The Tg was found to be strongly influenced by the incorporation of the small LS content. The Tg (temperature of tand peak maximum) for PU-LS film with LS content lower than or equal 3 wt.% increases considerable with increasing the concentration of LS. For higher concentrations, no significant additional increase in the Tg was observed. The crosslink density was also calculated from the elastic modulus at a temperature of 40 °C higher than the Tg based on the rubber elasticity theory. The crosslink density increases with increasing the LS content of the thin films. The thermal-induced shape-memory effect was investigated using DMA according to cyclic thermomechanical tensile tests. The PU-LS thin film was found to have an excellent shape-memory effect and the recovery was strongly dependent on the LS content. Fast recovery (17 sec) to the permeant shape was observed once the temporary shape sample was immersed in water bath at the programming temperature.

Original languageEnglish (US)
StatePublished - 2022
EventSPE ANTEC 2022 Conference - Charlotte, United States
Duration: Jun 14 2022Jun 16 2022


ConferenceSPE ANTEC 2022 Conference
Country/TerritoryUnited States

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering
  • Polymers and Plastics


Dive into the research topics of 'Shape-Memory Polymers Based on Castor Oil and Lignin Sulphonate Synthesized from Waterborne Dispersion'. Together they form a unique fingerprint.

Cite this