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Evalution of surface activity of hydrophobic modified nanocrystalline cellulose
Cellulose ( IF 5.7 ) Pub Date : 2020-09-04 , DOI: 10.1007/s10570-020-03415-z
Junliang Lu , Jinyan Lang , Ping Lan , Hongyan Yang , Jingxue Yang , Xunqian Wu , Heng Zhang

Abstract

Nanocrystalline cellulose (NCC) prepared via sulfuric acid hydrolysis was used as raw material. The nanocrystalline cellulose was graft-modified by long-chain fatty acids including lauric acid, palmitic acid, and stearic acid in a FeSO4/H2O2 oxidation–reduction system at low temperature. Modified nanocrystalline cellulose (MNCC) was obtained through above process. Crystalline structure and microstructure of the MNCC were analyzed and characterized. To explore the surface activities of the MNCC, contact angle, surface tension, critical micelle concentration (CMC) and hydrophile–lipophile balance (HLB) values were tested. Results showed that water contact angles of lauric acid-, palmitic acid-, and stearic acid-nanocrystalline cellulose were 79.3°, 82.5° and 84.8°, and HLB values were 15.78, 16.29 and 16.81, respectively. The CMC of the MNCC was 12.5 mg/L. The MNCC had good hydrophilic and lipophilic properties. It was a kind of non-ionic natural macromolecule surfactants and could replace traditional surfactants as emulsifiers and solubilizers.

Graphic abstract



中文翻译:

疏水改性纳米晶纤维素的表面活性评估

摘要

通过硫酸水解制备的纳米晶纤维素(NCC)被用作原料。用FeSO 4 / H 2 O 2中的长链脂肪酸(包括月桂酸,棕榈酸和硬脂酸)对纳米晶纤维素进行接枝改性。低温氧化还原系统。通过上述过程获得了改性的纳米晶纤维素(MNCC)。分析和表征了MNCC的晶体结构和微观结构。为了探索MNCC的表面活性,测试了接触角,表面张力,临界胶束浓度(CMC)和亲水-亲脂平衡(HLB)值。结果表明,月桂酸,棕榈酸和硬脂酸纳米晶纤维素的水接触角分别为79.3°,82.5°和84.8°,HLB值分别为15.78、16.29和16.81。MNCC的CMC为12.5 mg / L。MNCC具有良好的亲水性和亲脂性。它是一种非离子型天然高分子表面活性剂,可以代替传统的表面活性剂作为乳化剂和增溶剂。

图形摘要

更新日期:2020-09-05
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