英文题目:Determination of absolute molecular weight of sodium lignosulfonates (NaLS) by laser light scattering (LLS)

出版源:Holzforschung, 2013, 67(3):265-271

作者:Y Qian, Y Deng, Y Guo, C Yi, X Qiu*

本文通讯作者为华南理工大学邱学青教授。邱学青教授主要从事制浆造纸废液中回收的天然表面活性剂-工业木质素的应用基础及新型萃取工艺方法的教学与研究工作,他先后主持与完成国家自然科学杰出青年基金、国家"十一五"支撑计划子项目、"863"项目、广东省自然科学团队基金等国家、省部级及企业技术开发项目四十多项,发表学术论文100多篇,其中70多篇被SCI、EI收录。

图文摘要:The problems related to the determination of the absolute molecular weight (M-w) of sodium lignosulfonate (NaLS) are the focus of the present work. Four narrow-dispersed NaLS fractions were collected by filtration, ultrafiltration, and gel permeation chromatography (GPC), and their M-w measured by laser light scattering (LLSMw) was compared with that obtained by GPC (GPC(Mw)). The LLSMw values were much larger than GPC(Mw), and this M-w difference increased with increasing M-w of NaLS. This finding confirms the known polyelectrolyte and aggregation effects of NaLS. The deviation is also partly due to the conformation differences between the GPC standard (sodium polystyrene sulfonate) and the NaLS molecules. The effects of polyelectrolytes and NaLS aggregates could be inhibited by adding enough NaCl salt in the NaLS solution and filtering the NaLS/NaCl solution through a syringe filter. As a result, the slow mode in dynamic LLS measurement disappeared. By this approach, the absolute LLSMw values were only slightly larger than that determined by GPC due to the conformation differences between the GPC standard and the NaLS molecules.

在线阅读地址:degruyter.com

激光光散射(LLS)对木质素磺酸钠(NaLS)绝对分子量的测定【华南理工大学】

  • 1

Publications