蛋白质改性纤维素复合纤维的热力学性能

Thermal property of protein modified cellulose composite fiber

为了解蛋白质改性纤维素复合纤维的热力学性能,采用TG和DSC分析纤维的热力学特征,并对纤维的耐热性能和极限氧指数进行测试.结果表明：随着温度的升高,复合纤维的TG曲线有2个失重阶,主失重温度在312℃左右;复合纤维的DSC曲线呈现出双熔融峰;柔丝纤维在90～110℃时,断裂强度随着温度的升高而下降,当受热温度达到150℃时,复合纤维的断裂强度比原始值高15.1％,纤维受热后,断裂伸长变化率随着受热温度的升高,逐渐减小;复合纤维的燃烧性能与棉、粘胶纤维类似,极限氧指数为19％～20％.

To get an insight into the thermodynamic property of composite fiber, TG and DSC were used to analyze the thermodynamic property of composite fiber, along with the heat-resistance and limiting oxygen index. As the temperature increases, the composite fiber＇s TG curves appear two weight loss bands, and the main weight loss temperature is about 312℃. The composite fiber＇s DSC curve appears double melting peaks ; the breaking strength of composite fiber drops as the temperature increased to 90 ~ 110 ℃. However, when the heating temperature reaches 150 ℃ , the breaking strength of the composite fiber exhibits 15.1% higher than the original value. Increasing the temperature decreases the breaking elongation of the fiber. The combustion behavior of composite fiber is similar to those of cotton and viscose fibers, and the limiting oxygen index of the composite fiber is 19 -20%.