羟乙基纤维素/纳米纤维素稳定的Pickering乳液及其流变特性研究

doi:10.3969/j.issn.1001-1803.2023.03.001

摘要/Abstract

摘要：

以纤维素粉（α-Cellulose）为原料，通过酸水解法制备得到纳米纤维素（CNC），并对其结构和微观形貌进行了表征。选用大豆油为油相，羟乙基纤维素（HEC）/CNC复合物为乳化剂，制备得到稳定的Pickering乳液。研究CNC质量分数、油水体积比和HEC质量分数对Pickering乳液稳定性的影响，并通过流变学的手段对其进行分析。结果表明，随着HEC质量分数的增加，Pickering乳液稳定性增强。在油水体积比为8∶2，CNC质量分数为0.2%和HEC质量分数为0.4%时，乳液稳定性最强，其乳滴粒径约为20 μm，稳定时长可达100天以上。与单独使用CNC稳定的Pickering乳液相比，HEC/CNC复合物稳定的Pickering乳液具有更强的稳定性和更小的液滴直径。HEC/CNC复合物稳定的Pickering乳液呈现“剪切变稀”的流变特性，即溶液中HEC质量分数增加时，乳液剪切黏度随着剪切速率的增大而降低，剪切应力则相应地增强。

关键词: 纳米纤维素, 羟乙基纤维素, Pickering乳液, 稳定性, 流变特性

Abstract:

Nanocellulose （CNC） was prepared from α-Cellulose by acid hydrolysis method, and its structure and micromorphology were characterized. Pickering emulsion was prepared by using soybean oil as the oil phase and hydroxyethyl cellulose （HEC） and CNC as mixed emulsifiers （HEC/CNC）. The emulsion type was determined to be W/Oemulsion by dilution method. The thermal stability of the Pickering emulsion was tested, and the results showed that the stability of the Pickering emulsion stabilized by HEC/CNC was stronger than that of the Pickering emulsion prepared by CNC. The effects of CNC mass fraction, oil-water ratio, and HEC mass fraction on the stability of Pickering emulsion were studied. The rheological properties of Pickering emulsion stabilized by HEC/CNC were analyzed. The results showed that, with the increase of HEC mass fraction, the stability of Pickering emulsion was enhanced. When the oil-water ratio was 8∶2, the CNC mass fraction was 0.2% and the HEC mass fraction was 0.4%, the Pickering emulsion exhibited the strongest stability, and its emulsion droplet size was approximately 20 μm. The Pickering emulsion stabilized by HEC/CNC thus prepared could be stable for 100 days. The Pickering emulsion stabilized by HEC/CNC had stronger stability and smaller droplet diameter than that of the CNC-stabilized Pickering emulsion. The Pickering emulsion stabilized by HEC/CNC exhibited a rheological property of “shear-thinning”. When the HEC mass fraction in solution was increased, the shear viscosity of the emulsion decreased with the increase of shear rate.

Key words: nanocellulose, hydroxyethyl cellulose, Pickering emulsion, stability, rheological properties

中图分类号:

TQ658

丁正青, 吴颖异, 王维运, 黄旭娟, 蔡照胜. 羟乙基纤维素/纳米纤维素稳定的Pickering乳液及其流变特性研究[J]. 日用化学工业（中英文）, 2023, 53(3): 245-252.

Ding Zhengqing, Wu Yingyi, Wang Weiyun, Huang Xujuan, Cai Zhaosheng. Study on Pickering emulsion stabilized by hydroxyethyl cellulose/nanocellulose and its rheological properties[J]. China Surfactant Detergent & Cosmetics, 2023, 53(3): 245-252.

图/表 10

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