二甲基烯丙基木质素季铵盐-海藻酸钠两性聚电解质的制备及表征

Preparation and characterization performance of dimethylallyl quaternary ammonium salts of lignin-sodium alginate polyampholyte

为了扩大碱木质素的应用范围,研究了以二甲基烯丙基木质素季铵盐(DL)和海藻酸钠(SA)为原料,以戊二醛为交联剂,制备二甲基烯丙基木质素季铵盐-海藻酸钠两性聚电解质(DL-SA)。以对酸性黑ATT和亚甲基蓝的絮凝性能作为指标,通过单因素实验得出最佳合成条件为交联剂用量为3%(占单体质量百分比),反应温度为75℃,m(DL)∶m(SA)=2∶1,交联时间为4h,最优条件下测得对酸性黑ATT和亚甲基蓝的脱色分别为86.24%和99.15%。考察了其溶解性、含氮量以及两性聚合物的特点——等电点,采用FI-IR表征了产物的结构。结果表明,DL和SA接枝成功,其含氮量由DL的2.14%减少为1.25%,且DL-SA的等电点为4.42,具有两性化合物的特征。

In order to improve application of lignin,dimethylaiiyl quaternary ammonium salt of lignin-sodium alginate polyampholyte(DL-SA)was prepared with dimethylallyl quaternary ammonium salt of lignin(DL)and sodium alginate(SA)and the cross linker was glutaraldehyde.The optimum conditions obtained by monotheism experiments were on the standard of nitrogen content and flocculate ability for acid black ATT,which include:m(DL)∶m(SA)=2∶1;75℃ of reaction temperature,4hof reaction time and 4wt% of the glutaraldehyde dosage,which the decolorization rate of acid black ATT was 90.08%.It was investigated the solubility and amphoteric polymer characteristics,ie,isoelectric point.Its structure was analyzed by FT-IR,which was found that DL and SA was grafted successfully,and its nitrogen content was reduced from 2.14%to 1.25%.Its isoelectric point was 4.22 and it has compound characteristics.