[The effect of temperature on the structure and properties of polyurethane-urea by FTIR].
The effect of temperature on the structure and properties of polyurethane-urea was investigated by in situ FTIR. Data from FTIR spectra showed that with increasing temperature the nu NHHbonded areas decrease and the nu NHfree band areas increase. The band site of nu NHHbonded shifted to higher wavenumbers and the band site of nu NHfree keeps constant. The band site of Cfree urethane shift from 1,731 cm-1 to 1,736 cm-1. All kinds of carbonly bands sites shifted to high wavenumbers. But the band sites of amide II and the C=C in aromatic ring shifted to low wavenumbers. The properties of PUU polymers was determined by the structure of soft domains.
Li
Z
Z
State Key Laboratory of Heavy Oil Processing, University of Petroleum, 102200 Beijing.
Yang
G
G
Li
D
D
Xin
H
H
D011140:Polyurethanes / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014732:Vibration
D011140:Polyurethanes; C044690:polyetherurethane urea