羊绒纤维接枝丙烯腈改性工艺研究

Cashmere grafting modification with acrylonitrile

以丙烯腈为接枝单体,以过氧化氢、硫酸亚铁铵组成的氧化还原体系为引发剂,通过自由基聚合反应,在羊绒纤维表面进行接枝改性。通过正交试验得出了影响接枝率的主要因素和最优工艺方案,在此最优方案条件下丙烯腈接枝率可达到94.12%。对接枝改性前后的羊绒纤维进行电镜分析、红外光谱分析和羊绒强伸性能测试,结果表明:改性后的羊绒纤维表面鳞片结构趋于平滑;改性后红外图谱中2 243 cm^(-1)处和1 465 cm^(-1)处出现新的吸收峰,验证了接枝反应的发生;接枝改性后羊绒纤维的断裂强度有所提升。

Modification of cashmere is carried out by radical graft polymerization with acrylonitrile as a graft monomer, redox system consisting of hydrogen peroxide and ferrous ammonium persulfate as an initiator. The main experiment conditions are studied based on orthogonal experiment, and the main factors affecting the grafting efficiency and the optimal solution are obtained. The grafting efficiency can reach 94.12% under the optimal process. Scanning electronic microscope, fourier transform infrared tester and electronic single fiber strength tester are employed to test the cashmere before and after grafting modification. Testing results show that the squama of the modified cashmere fiber tends to be smoother, the new appeared absorption peaks at 2 243cm^-l and 1 465cm^-1 in the FTIR spectra confirm the grafting reaction process, and the breaking strength of cashmere after modification improves.