期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 3, 期 7, 页码 1551-1557出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.5b00252
关键词
Alkali lignin; Sulfonation; 1,4-Butane sultone; Dispersion; Carbendazim suspension concentrate
资金
- National Basic Research Program of China 973 [2012CB215302]
- International S&T Cooperation Program of China [2013DFA-41670]
- National Natural Science Foundation of China [21402054, 21436004]
- Scientific Research Foundation for Advanced Talents [D614020-3]
A new family of highly water-soluble alkyl chain cross-linked sulfobutylated lignosulfonates (AASLSs) with a three-dimensional network structure and naked alkyl sulfonic acid groups were readily prepared by using 1,4-butane sultone (BS) and C6H12Br2 by a one step reaction in water, which simultaneously improved the sulfonation degree and molecular weight. GPC, H-1 NMR, FTIR and functional group content tests confirmed their cross-linked chemical structure and efficient nucleophilic substitution reaction mechanism. Furthermore, the dispersion properties of AASLSs in a carbendazim suspension concentrate (SC) system were investigated. AASLS4 with high molecular weights (M-w) and moderate sulfonation degrees showed suspensibility of 99% in 45% carbendazim SC after hot storage at 50 degrees C for 14 days. Meanwhile, AASLS4 also showed smaller SC particle size and better rheological performance than commercial lignosulfonate. The adsorption isotherms and zeta-potential of AASLSs on carbendazim SC particles were studied to reveal the dispersion mechanism. The alkyl chain cross-linked structure and long alkyl chain-containing sulfonic acid groups contribute to the excellent dispersion properties on carbendazim SC. Our modification approach for lignin might provide a novel concept and prospective avenue for the design of efficient dispersants.
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