羟乙基纤维素和γ-聚谷氨酸混合体系的流变行为及协同机理

doi:10.3969/j.issn.1001-1803.2022.06.001

摘要/Abstract

摘要：

通过考察羟乙基纤维素（HEC）和γ-聚谷氨酸（γ-PGA）混合体系的表观黏度、流动曲线、黏弹性、黏温曲线等流变学性质,系统研究了该混合体系的流变行为,同时表征了羟乙基纤维素和γ-聚谷氨酸混合体系的微观结构。实验结果表明,固定HEC和γ-PGA总质量分数为1.2%的条件下,HEC和γ-PGA以不同的质量比混合后都有协同增黏的效果,HEC和γ-PGA质量比为2∶1时的协同增黏效果最明显。单一HEC体系、单一γ-PGA体系和HEC/γ-PGA混合体系均为剪切变稀的流体,其流动曲线可用Cross本构方程进行拟合,相关相关系数（R）均大于0.999。对比单一的HEC和γ-PGA体系,HEC/γ-PGA混合体系的线性黏弹区范围增加,即HEC/γ-PGA混合体系整体抗应变能力增强。在频率扫描中,HEC和γ-PGA混合后弹性模量（G'）和黏性模量（G''）的交点向低频方向移动,说明混合体系比单一体系的弹性更加显著。同时,随着温度的升高,单一HEC和γ-PGA体系、HEC/γ-PGA混合体系的表观黏度都呈现不同程度下降,它们的黏温曲线都可以用Arrhenius方程较好地拟合,相关系数都大于0.996。且HEC/γ-PGA混合体系在温度低于45 ℃时混合体系以弹性特征为主,混合体系在温度高于45 ℃时黏性特征占主体。此外,通过微观结构观察可以发现HEC和γ-PGA混合后高分子聚合物的物理缠结和三维网络结构的加强。

关键词: 羟乙基纤维素, γ-聚谷氨酸, 流变行为, 协同机理

Abstract:

The rheological properties of the mixed system of hydroxyethyl cellulose （HEC） and γ-polyglutamic acid （γ-PGA） were systematically studied by investigating the apparent viscosity, flow curves, viscoelasticity, viscosity-temperature curves and other rheological properties. The microstructure of the mixed system of HEC and γ-PGA was also characterized. The experimental results showed that HEC and γ-PGA had synergistic effect of increasing viscosity at different mass ratios when the total mass fraction of HEC and γ-PGA was 1.2%, in which the synergistic effect of increasing viscosity was most obvious when the mass ratio of HEC/γ-PGA was 2∶1. Single HEC system, single γ-PGA system and mixed HEC/γ-PGA system were all shear thinning fluids, and their flow curves could be well fitted by Cross equation, and the correlation coefficients （R） were all greater than 0.999. Compared with the single systems of HEC and γ-PGA, the range of linear viscoelastic region of the mixed HEC/γ-PGA system increased, i.e., the overall strain resistance of the mixed HEC/γ-PGA system was enhanced. In frequency scanning, the intersection of elastic modulus （G'） and viscous modulus （G''） of HEC and γ-PGA mixtures moved to the low frequency direction, indicating that the mixed system was more elastic than the single system. Meanwhile, with the increase of temperature, the apparent viscosities of single HEC, single γ-PGA and mixed HEC/γ-PGA systems were decreased to varying extent. The viscosity-temperature curves of these systems could be well fitted by the Arrhenius equation, and the correlation coefficients were greater than 0.996. For the mixed HEC/γ-PGA system, the elastic feature was dominant when the temperature was lower than 45 ℃, while the viscous feature was dominant when the temperature was higher than 45 ℃. In addition, the physical entanglement and three-dimensional network structure were strengthened after mixing HEC and γ-PGA, as shown in microstructure observation.

Key words: hydroxyethyl cellulose, γ-polyglutamic acid, rheological behavior, synergistic mechanism

中图分类号:

TQ658

陈晗俊,庄洁,吴旭,沈兴亮,张婉萍,张倩洁. 羟乙基纤维素和γ-聚谷氨酸混合体系的流变行为及协同机理[J]. 日用化学工业, 2022, 52(6): 577-584.

Chen Hanjun,Zhuang Jie,Wu Xu,Shen Xingliang,Zhang Wanping,Zhang Qianjie. Rheological behavior and synergistic mechanism of the mixed system of hydroxyethyl cellulose and γ-polyglutamic acid[J]. China Surfactant Detergent & Cosmetics, 2022, 52(6): 577-584.

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样品类型	λ/s	η₀/（Pa·s）	η_∞/（Pa·s）	m	R
0.8% HEC+0.4% γ-PGA	29.52	94.05	0.26	0.62	0.999 95
0.8% HEC	1.07	3.69	0.06	0.54	0.999 66
0.4% γ-PGA	0.96	1.83	0.05	0.48	0.999 25