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首页> 外文期刊>RSC Advances >Ultrahigh molecular weight, lignosulfonate-based polymers: preparation, self-assembly behaviours and dispersion property in coal-water slurry
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Ultrahigh molecular weight, lignosulfonate-based polymers: preparation, self-assembly behaviours and dispersion property in coal-water slurry

机译：超高分子量，木质素磺酸盐基聚合物：水煤浆的制备，自组装行为和分散性

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摘要

Using a novel and facile method, we synthesized a family of ultrahigh molecular weight, lignosulfonate-based polymers (ALSs) via alkyl chain coupling polymerization. Gel permeation chromatography (GPC) showed a significant increase in weight-average molecular weights (Mws), from 42 800 Da of ALS1 to 251 000 Da of ALS5-one of the highest Mws among reported lignosulfonates (LSs) to date. Functional group content measurements, FTIR and H-1-NMR confirmed the efficient polymerization by nucleophilic substitution coupling mechanism and suggested a straightforward relationship between the polymerization of lignosulfonate (LS) and consumption of phenolic hydroxyl groups. Moreover, hollow nanospheres were obtained via self-assembly of water-soluble ALS and were investigated by DLS, SEM, TEM and AFM. The hollow sphere structure, with a hydrophilic core and a hydrophobic shell, was confirmed by XPS and elemental analysis. Stable, quasi-solid nanospheres were obtained from ALS by the addition of cetyl trimethyl ammonium bromide (CTAB). Furthermore, ALS2, with its relatively high molecular weight, showed unexpectedly better dispersion properties than the raw material LS and naphthalene sulfonate formaldehyde condensate (NSF) for coal-water slurry. The effective polymerization route to improving Mw and the self-assembly from polymer-only ALS provide novel avenues for high-value application of lignin, a sustainable and abundant bioresource.
机译：使用新颖而简便的方法，我们通过烷基链偶联聚合反应合成了一系列超高分子量，木质素磺酸盐基聚合物（ALS）。凝胶渗透色谱法（GPC）显示重均分子量（Mws）显着增加，从ALS1的42800 Da增加到251 000 Da的ALS5- ALS5-迄今报道的木质素磺酸盐（LSs）中最高的Mws。官能团含量的测量，FTIR和H-1-NMR证实了亲核取代偶联机制可实现有效聚合，并表明木质素磺酸盐（LS）的聚合与酚羟基的消耗之间存在直接的关系。此外，空心纳米球是通过水溶性ALS的自组装获得的，并通过DLS，SEM，TEM和AFM进行了研究。 XPS和元素分析证实了具有亲水核和疏水壳的空心球结构。通过添加十六烷基三甲基溴化铵（CTAB），从ALS获得了稳定的准固体纳米球。此外，相对于水煤浆的原料LS和萘磺酸萘缩甲醛（NSF）而言，具有相对较高分子量的ALS2表现出出乎意料的更好的分散性能。改善Mw的有效聚合途径和仅由聚合物制得的ALS的自组装为木质素的高价值应用提供了新途径，木质素是一种可持续且丰富的生物资源。

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