Li Zai-feng, Xu Chun-ming, Yin Shu-mei, Wen Li-rong
Department of Applied Chemistry, Qingdao Institute of Chemical Technology, Qingdao 102200, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2002 Oct;22(5):774-8.
The development of morphology and mechanical properties of PUU in bulk prepolymer polymerization process was investigated by TEM and in situ FTIR. The data from the FTIR spectra showed that the absorbance of NH band was becoming sharp and its band sites shifted to lower wavenumbers with the increase of reaction time, the absorbance of free urethance carbonyl kept nearly constant at low conversion, and then became weaker, and finally became little because of strong hydrogen bond affect of more and more new wrealink group at high conversion. With increasing of the reaction time, the band sites of urea carbonyl also shifted to the lower wavenumbers and at the same time, the absorbance of ordered urea carbonyl became sharper and sharper. The carbonyl bands vibration models available during curing process were further assigned. The photos of TEM showed that the domains of hard segments became clearer with buildup of hydrogen bond between urealinks.
通过透射电子显微镜（TEM）和原位傅里叶变换红外光谱（FTIR）研究了本体预聚物聚合过程中聚醚型聚氨酯（PUU）的形态和力学性能的发展。FTIR光谱数据表明，随着反应时间的增加，NH带的吸光度变得尖锐，其谱带位置向低波数移动，游离脲羰基的吸光度在低转化率时几乎保持恒定，然后变弱，最终由于高转化率时越来越多新的脲键基团的强氢键作用而变得很小。随着反应时间的增加，脲羰基的谱带位置也向低波数移动，同时，有序脲羰基的吸光度变得越来越尖锐。进一步确定了固化过程中可用的羰基谱带振动模型。TEM照片显示，随着脲键之间氢键的形成，硬段区域变得更加清晰。
