PEG浓度对锂藻土分散液的再凝胶化及屈服行为的影响

doi:10.7503/cjcu20140448

高等学校化学学报 ›› 2014, Vol. 35 ›› Issue (10): 2252.doi: 10.7503/cjcu20140448

PEG浓度对锂藻土分散液的再凝胶化及屈服行为的影响

疏瑞文, 孙尉翔, 刘新星, 童真()

华南理工大学材料科学研究所, 发光材料与器件国家重点实验室, 广州 510640

收稿日期:2014-05-12 出版日期:2014-10-10 发布日期:2014-09-17
作者简介:联系人简介: 童真, 男, 博士, 教授, 博士生导师, 主要从事高分子物理研究. E-mail: mcztong@scut.edu.cn。
基金资助:
国家自然科学基金(批准号: 51173052, 21204023)和国家“九七三”计划项目(批准号: 2012CB821504)资助

Effect of Poly(ethylene glycol) Concentration on the Re-entrant Gelation and Yielding Behavior of Aqueous Hectorite Clay Dispersion^†

SHU Ruiwen, SUN Weixiang, LIU Xinxing, TONG Zhen^*()

Research Institute of Materials Science and State Key Laboratory of Luminescent Materials and Devices,South China University of Technology, Guangzhou 510640, China

Received:2014-05-12 Online:2014-10-10 Published:2014-09-17
Contact: TONG Zhen E-mail:mcztong@scut.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(Nos.51173052, 21204023) and the National Basic Research Program of China(No.2012CB821504)

摘要/Abstract

摘要：

通过离子电导率和pH考察了锂藻土自身释放的Na⁺浓度, 说明未经透析或离子交换处理的c_w=30 mg/mL的锂藻土分散液静置老化后形成的软固体是反应置限团簇聚集(RLCA)的胶体凝胶. 通过剪切流变方法研究了聚乙二醇(PEG)浓度c_p对锂藻土/PEG分散液体系的线性和非线性黏弹性的影响. 小幅振荡剪切(SAOS)频率扫描结果表明, 随着c_p增加, 锂藻土发生“RLCA凝胶-黏弹性液体-排空(Depletion)凝胶”转变, 可观察到该体系的再凝胶化行为. 稳态剪切和大振幅剪切实验结果表明, 锂藻土/PEG分散体系的再凝胶化的非线性流变学行为也有体现.

关键词: 锂藻土, 聚乙二醇, 再凝胶化, 屈服行为, 小幅振荡剪切, 反应置限团簇聚集

Abstract:

The Na⁺ concentration released from hectorite clay was evaluated from the conductivity and pH. The results indicated that the soft solid formed by 30 mg/mL aqueous hectorite clay dispersion after aging without dialysis or ion exchange was reaction-limited cluster aggregation(RLCA) colloidal gel. The effect of polyethylene glycol(PEG) concentration c_p on the linear and nonlinear viscoelasticity of the hectorite clay/PEG dispersions was investigated by rheology. Small amplitude oscillatory shear(SAOS) frequency sweep indicated that the hectorite clay/PEG gel dispersion experienced a “RLCA colloidal gel-viscoelastic liquid-depletion colloidal gel” transition with increasing c_p. The re-entrant gelation was firstly observed in this dispersion. Shear viscosity and dynamic moduli under large amplitude oscillatory shear revealed that the PEG concentration affected similarly on the yielding behavior of the hectorite/PEG dispersion.

Key words: Laponite, Polyethylene glycol, Re-entrant gelation, Yielding behavior, Small amplitude oscillatory shear, Reaction-limited cluster aggregation

TrendMD:

疏瑞文, 孙尉翔, 刘新星, 童真. PEG浓度对锂藻土分散液的再凝胶化及屈服行为的影响. 高等学校化学学报, 2014, 35(10): 2252.

SHU Ruiwen, SUN Weixiang, LIU Xinxing, TONG Zhen. Effect of Poly(ethylene glycol) Concentration on the Re-entrant Gelation and Yielding Behavior of Aqueous Hectorite Clay Dispersion^†. Chem. J. Chinese Universities, 2014, 35(10): 2252.

图/表 6

Fig.1 Dynamic storage modulus G'(filled symbols) and loss modulus G″(open symbols) as a function of ω for hectorite clay/PEG samples with cw=30 mg/mL and cp=0—10 mg/mL at γ0=0.5%

Fig.2 Storage modulus G' plotted against PEG concentration cp at γ0=0.5% of hectorite clay/PEG samples L30Pcp ω/(rad·s-1): a. 0.1; b. 1; c. 10.

Fig.3 Steady shear viscosity curves of hectorite clay/PEG samples L30Pcp with indicated σp

Fig.4 Shear stress of hectorite clay/PEG samples L30Pcp with indicated cp at 25 ℃

Fig.5 Strain amplitude γ0 dependence of the storage modulus G'(filled symbols) and loss modulus G″(open symbols) of hectorite clay/PEG samples L30Pcp with indicated cp at ω=6.28 rad/s Inset: cp dependence of the strain amplitude threshold γ0,c.

Fig.6 Strain amplitude γ0 dependence of the normalized loss modulus G″ of hectorite clay/PEG samples L30Pcp with indicated cp at ω=6.28 rad/s

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PEG浓度对锂藻土分散液的再凝胶化及屈服行为的影响

Effect of Poly(ethylene glycol) Concentration on the Re-entrant Gelation and Yielding Behavior of Aqueous Hectorite Clay Dispersion^†

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PEG浓度对锂藻土分散液的再凝胶化及屈服行为的影响

Effect of Poly(ethylene glycol) Concentration on the Re-entrant Gelation and Yielding Behavior of Aqueous Hectorite Clay Dispersion†

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Effect of Poly(ethylene glycol) Concentration on the Re-entrant Gelation and Yielding Behavior of Aqueous Hectorite Clay Dispersion^†