氯化镧与聚氨酯相互作用的FTIR研究

The Interaction between La and Polyurethane System

将LaCl3 掺入PU制得LaCl3 /PU复合体系。DSC的结果显示LaCl3 的加入使得PU体系的相转变行为发生了变化 ,位于 11 5 8℃的吸热峰消失。通过FTIR研究表明 :La3 + 与PU体系内的羰基发生了络合配位作用 ,使得PU的氢键结构体系发生了变化 ,峰位分别由 16 33和 3311cm-1蓝移至 16 4 7和 335 5cm-1。远红外光谱的中 2 0 0cm-1峰的出现也进一步证明了La—O键的形成。这为PU与氯化镧的络合作用的存在提供了直接的证据。

A series of polyether polyurethane (PU)-LaCl3 composites with different lanthanum contents were prepared. DSC results indicate that LaCl3 promotes phase transition behavior of the LaCl3/PU Composites, which causes the endothermic peak at 11.58degreesC to disappear. FTIR spectroscopy demonstrates that significant variation can be observed. The peak at 1633 cm(-1) attributed to carbonyl vibration and the peak at 3 311 cm(-1) attributed to N-H stretching band moves to 1647 cm(-1) and 3 355 cm(-1), respectively, when LaCl3 is introduced into the PU system. A new band (-200 cm(-1)) assigned to the La-O band was observed, and the far IR result provided a direct evidence of the coordination between La3+ ion and Cdouble bondO group of PU system.