Petru Poni Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, Iasi, Romania.
Bioresour Technol. 2010 Nov;101(22):8549-54. doi: 10.1016/j.biortech.2010.06.049. Epub 2010 Jul 15.
Flocculation properties of a series of cationic polysaccharides, with N-alkyl-N,N-dimethyl-N-(2-hydroxypropyl)ammonium chloride pendent groups attached to a dextran backbone, were evaluated in clay dispersions with respect to length of the alkyl substituent, molar mass, the charge density, and polycation dose. According to turbidimetric results, the alkyl chain length greatly influenced the optimum polymer dose as well as the width of the flocculation window since both increased from an ethyl to a butyl group and decreased for when octyl or dodecyl group was present. The residual turbidity values also varied with the charge density but no dramatic effect was observed with the molar masses investigated. These findings together with the negative value of the zeta potential at the optimum polymer dose and floc size measurements, point to contributions from both patch and bridging mechanisms for the flocculation process.
一系列带有 N-烷基-N,N-二甲基-N-(2-羟丙基)氯化铵侧基的阳离子多糖的絮凝性质，以葡聚糖为主链，用粘土分散体进行了评价，考察了烷基取代基的长度、摩尔质量、电荷密度和聚阳离子剂量。根据浊度结果，烷基链长度极大地影响了最佳聚合物剂量以及絮凝窗口的宽度，因为从乙基到丁基基团增加，而当存在辛基或十二烷基基团时减少。残余浊度值也随电荷密度而变化，但在所研究的摩尔质量上没有观察到明显的影响。这些发现以及最佳聚合物剂量和絮体尺寸测量时的zeta 电位的负值表明，絮凝过程既存在斑状机制也存在桥接机制。
