Optically active polyurethane (OPU) derived from chiral tyrosine possesses a single-handed helical conformation and optical activity owing to the induced asymmetric force field in the chiral monomer. The regular secondary structure facilitates the formation of numerous interchain hydrogen bonds, which increases the crystallinity and thermal stability of OPU. The high-temperature infrared spectroscopy results indicate that the hydrogen bonding collapses before thermal decomposition. Both helical stereostructures and hydrogen bonding contribute to the decreasing of infrared emissivity for OPU.
- Yong Yang
- Chen Sun
- Yiwei Zhang
