TDI改性对苎麻纤维密度及力学性能的影响

Effect of TDI Modifying on Density and Mechanical Property of Ramie Fiber

研究了优化工艺条件下甲苯-2,4-二异氰酸酯(TDI)与苎麻纤维和纱线接枝改性后的密度及力学性能,并用红外光谱仪和X射线衍射仪对接枝前后纤维的结构和晶型进行了表征。结果表明:碱处理和TDI接枝改性后,苎麻纤维和纱线的密度增大;抗拉强度明显降低,其中苎麻纤维碱处理后抗拉强度下降26.29%,接枝后下降29.13%(有超声)和22.67%(无超声);苎麻纱线碱处理后抗拉强度下降39.04%,接枝后下降35.51%。

The density and mechanical property of ramie fiber and yarn which were treated by alkali and grafted by TDI on the optimal reaction conditions were studied.The molecular structure and crystal structure of ramie fiber were analyzed by IR and XRD.The results showed that,the density of ramie fiber and yarn which were treated by alkali and grafted by TDI was increased;the tensile strength of ramie fiber and yarn was decreased significantly.The tensile strength of ramie fiber treated by alkali declined 26.29%,and of the one grafted by TDI declined 29.13%（ultrasonic） and 22.67%（no ultrasonic）.The tensile strength of ramie yarn treated by alkali declined 39.04%,and of the one grafted by TDI declined 35.51%.