Preparation of alkyl chain cross-linked sulfobutylated lignin and its application in dispersion of carbon nanotubes

doi:10.11949/j.issn.0438-1157.20151035

Abstract

Abstract:

Using 1,4-butane sultone as a sulfonating agent and C₆H₁₂Br₂ as an alkyl chain cross-linking agent, a new family of water soluble alkyl chain cross-linked sulfobutylated lignosulfonates (AASLS) was readily prepared by one step reaction in water, which simultaneously improved sulfonation degree and molecular weight. FTIR, ¹H NMR, functional group content tests and GPC confirmed their cross-linked chemical structure and efficient nucleophilic substitution reaction mechanism. The dispersion properties of AASLS-carbon nanotubes (CNT) suspension system were systematically studied. The results showed that when the dosage was 2% (mass), AASLS-CNT suspensions had a higher absorption at 660 nm with a higher suspension stability than that in polyvinyl pyrrolidone (PVP) and sodium polystyrene sulfonate (PSS). Moreover, the transmission electron microscopy (TEM) indicated that the incorporation of AASLS could effectively solve the problem of the agglomeration of CNT. The Raman absorption spectra showed that the I₁₃₅₀/I₁₅₈₀ value of CNT was effectively reduced by the non-covalent functionalization of AASLS, showing that the density of surface defects was decreased. In cyclic voltammogram (CV) test of AASLS-CNT, it was found that AASLS-CNT showed the quasi reversible redox behaviors.

Key words: alkali lignin, sulfobutylated, polymer, carbon nanotube, dispersion

摘要：

利用1,4-丁磺酸内酯作为磺化剂,1,6-二溴己烷作为烷基化桥联剂对碱木质素进行改性,通过一步反应制备了兼有烷基磺酸基和烷基链的交联结构的新型聚合物——烷基桥联丁基磺酸磺化木质素 (AASLS),并系统研究了AASLS在碳纳米管(CNT)悬浮液体系的分散性能。结果表明,当分散剂质量掺量为2%时,AASLS分散的CNT悬浮液在660 nm处的吸收高于由聚苯乙烯磺酸钠(PSS)和聚乙烯吡咯烷酮(PVP)分散的CNT悬浮液,悬浮稳定性更高;透射电镜测试结果进一步表明AASLS的掺入有效解决了CNT的团聚问题;拉曼光谱表明,通过AASLS的非共价功能化修饰,CNT的I₁₃₅₀/I₁₅₈₀值有效降低;电化学测试表明AASLS与CNT形成的复合物在酸性电解液中可进行准可逆的氧化反应。

关键词: 碱木质素, 桥联磺化, 聚合物, 碳纳米管, 分散

CLC Number:

O636.2

ZENG Weimei, LI Yuan, LI Yuda, DENG Yonghong, QIU Xueqing. Preparation of alkyl chain cross-linked sulfobutylated lignin and its application in dispersion of carbon nanotubes[J]. CIESC Journal, 2016, 67(1): 331-338.

曾伟媚, 李远, 李昱达, 邓永红, 邱学青. 烷基桥联丁基磺酸磺化木质素的制备及其在分散碳纳米管中的应用[J]. 化工学报, 2016, 67(1): 331-338.

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