Synthesis and properties of liquid crystalline polyurethanes
Journal of Polymer Science Part A: Polymer Chemistry
Volume 31, Issue 5, Date: April 1993, Pages: 1211-1220
Piotr Penczek, Kurt C. Frisch, Barbara Szczepaniak, Ewa Rudnik
http://www3.interscience.wiley.com/journal/104048515/abstract