粘胶纤维分子结构及热稳定性研究

Study of Viscose Fibre Molecular Structure and Thermal Stability

采用中红外(MIR)光谱开展了粘胶纤维分子结构研究。粘胶纤维分子中红外吸收模式主要包括:O-H伸缩振动模式(ν_(O-H-粘胶纤维)),CH_(2)不对称伸缩振动模式(ν_(asCH_(2)-粘胶纤维))和C-O伸缩振动模式(ν_(C-O-粘胶纤维))。采用变温中红外(TD-MIR)光谱进一步开展了温度变化对于粘胶纤维分子结构的影响。在303 K~393 K的温度范围内,随着测定温度的升高,粘胶纤维分子ν_(O-H-粘胶纤维)、ν_(asCH_(2)-粘胶纤维)和ν_(C-O-粘胶纤维)对应的红外吸收频率和强度均发生明显改变,分子热稳定性进一步降低,并进一步进行了相关机理的研究。研究拓展了MIR光谱及TD-MIR光谱在重要纺织原料(粘胶纤维)分子结构及热稳定性的研究范围。

The viscose fibre molecular structure was characterized by the middle infrared(MIR)spectroscopy.The infrared absorption modes of viscose fibre molecule included 0-H stretch vibration mode(ν_(O-H-viscose fibre))CH_(2) asymmetrical stretch vibration mode(ν_(asCH_(2)-viscose fibre))and C-O stretch vibration mode(V_(C-O-viscose fibre)).The temperature effects on viscose fibre molecular structure by temperature-dependent middle infrared(TD-MIR)spectroscopy were further studied in the temperature range of 303 K~393 K.With the increase of the temperature,the corresponding frequency and intensity of viscose fibre molecules(ν_(O-H-viscose fibre),ν_(asCH_(2)-viscose fibre) andν_(C-O-viscose fibre))had changed obviously.The thermal stability of molecule further reduced,and the relevant mechanism was further studied.The research scopes of MIR spectroscopy and TD-MIR spectroscopy in the analysis of molecular structure and thermal stability of important textile material(viscose fibre)were broadened.