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Dispersion of quinacridone pigments using cellulose nanofibers promoted by CH–π interactions and hydrogen bonds
Cellulose ( IF 5.7 ) Pub Date : 2020-01-23 , DOI: 10.1007/s10570-020-02987-0
Yasuko Saito , Shinichiro Iwamoto , Naoya Hontama , Yuki Tanaka , Takashi Endo

Abstract

Organic pigments are prone to aggregate, resulting in decreasing of their properties. Therefore, pigment dispersants are demanded to have both high adsorption capacity and aggregation inhibiting property for pigment particles. In the present study, the suitability of cellulose nanofibers (CNFs) as a dispersant for quinacridone, a common red–violet organic pigment, was investigated. Quinacridone particles were well adsorbed on the CNFs. Scanning electron microscopy images of the quinacridone–CNF mixtures showed that the quinacridone primary particles were stacked along the cellulose fibers, and the aggregations were inhibited. In addition, the size of the quinacridone particles had an effect on their color. The interactions of quinacridone and cellulose were investigated by Fourier transform infrared (FTIR) and solution-state nuclear magnetic resonance (NMR) spectroscopies. FTIR spectra of the quinacridone–CNF mixtures indicated the intermolecular interactions between quinacridone and cellulose. Because quinacridone and CNFs were insoluble in the NMR solvents, gel-state NMR spectroscopy, which has been used for the whole plant cell wall analysis, was conducted on them. Consequently, whole signals arising from quinacridone and cellulose were enabled to be assigned, and the coupling constant of quinacridone has reported for the first time. The nuclear Overhauser effect spectroscopy (NOESY)-NMR spectrum of the quinacridone–CNF mixture revealed both NH group and aromatic moiety of quinacridone were interacted with glucose unit. The former was considered to be related to hydrogen bonding, and the latter to CH–π interactions. These specific interactions might contribute to achieve the high adsorption capacity of CNFs for quinacridone.

Graphic abstract



中文翻译:

CH-π相互作用和氢键促进的纤维素纳米纤维对喹ac啶酮颜料的分散

摘要

有机颜料易于聚集,导致其性能下降。因此,要求颜料分散剂对颜料颗粒具有高吸附能力和凝集抑制性能。在本研究中,研究了纤维素纳米纤维(CNF)作为喹ac啶酮(一种常见的红紫色有机颜料)的分散剂的适用性。喹ac啶酮颗粒很好地吸附在CNF上。喹ac啶酮-CNF混合物的扫描电子显微镜图像显示,喹ac啶酮初级颗粒沿纤维素纤维堆积,并且聚集受到抑制。另外,喹ac啶酮颗粒的尺寸对其颜色有影响。通过傅里叶变换红外光谱(FTIR)和溶液态核磁共振谱(NMR)研究了喹ac啶酮与纤维素的相互作用。喹ac啶酮-CNF混合物的FTIR光谱表明,喹ac啶酮和纤维素之间存在分子间的相互作用。由于喹ac啶酮和CNF不溶于NMR溶剂,因此对它们进行了凝胶态NMR光谱分析,该光谱已用于整个植物细胞壁的分析。因此,能够分配由喹ac啶酮和纤维素产生的全部信号,并且喹ac啶酮的偶联常数是首次报道。喹ac啶酮-CNF混合物的核Overhauser效应谱(NOESY)-NMR光谱显示,喹ac啶酮的NH基团和芳族部分均与葡萄糖单元相互作用。前者被认为与氢键有关,而后者则与CH-π相互作用有关。这些特定的相互作用可能有助于实现CNF对喹ac啶酮的高吸附能力。

图形摘要

更新日期:2020-01-23
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