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本文研究了以高锰酸钾为引发剂、苯乙烯—丙烯腈为共聚单体的纤维素接枝共聚反应。实验表明在水作为反应介质的情况下,接聚反应可以顺利进行。讨论了影响接聚反应的一些参变数和接枝规律性,接聚纤维的红外光谱和元素分析说明接枝共聚反应不是完全按电荷转移络合物的形式聚合的,在接枝共聚物中,苯乙烯与丙烯腈的摩尔比随着接枝量的增加而上升,但苯乙烯链段的嵌段性较小。用扫描电镜及X-射线衍射观察和分析了接枝纤维,结果表明接聚反应主要在纤维的无定形区进行,形成的支链大分子间有一定的规整性。用DSC测试了接枝纤维的热性能,扫描结果有一个接枝共聚物的环化放热峰和两个分解吸热峰。此外,试验了接枝纤维的耐湿磨性、吸湿性、染色性和力学性能。
In this paper, the graft copolymerization of cellulose with potassium permanganate as initiator and styrene-acrylonitrile as comonomer was studied. Experiments show that in the case of water as the reaction medium, the polymerization reaction can proceed smoothly. Some parametric parameters and grafting regularities affecting the polymerization were discussed. The infrared spectrum and elemental analysis of the graft copolymerization showed that the graft copolymerization did not completely polymerize in the form of charge transfer complex. In the graft copolymer, The molar ratio of styrene to acrylonitrile increases with the amount of graft, but the styrene block has less blockiness. The grafted fibers were observed and analyzed by scanning electron microscopy and X-ray diffraction. The results showed that the polyaddition reaction was mainly carried out in the amorphous region of the fiber, and the formed branched macromolecules had some regularity. The thermal properties of the grafted fibers were tested by DSC. The result of the scanning was a cyclodegenerated exothermic peak and two decomposed endothermic peaks of the graft copolymer. In addition, wet abrasion resistance, hygroscopicity, dyeing and mechanical properties of the grafted fibers were tested.