Polymer adsorption on inorganic particles and rheological properties of the dispersions

聚合物对无机颗粒的吸附和分散体的流变性能

• 批准号: 03453109
• 负责人: KAWAGUCHI Masami
• 金额: $ 0.64万
• 依托单位: MIE UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03453109/
• 关键词: inorganic particles; polymer adsorption; rheology; silica suspensions; shear stress; flow curves; storage modulus; せん断速度; 動的粘弾性; レオメ-タ; 無機粒子ー高分子分散系; レオロジ-; シリカ; 吸着の動力学; 吸着等温線; HPMC

In this study, rheological properties of silica particles dispersed in aqueous solutions of hydroxypropyl methyl cellulose (HPMC) were investigated in combination of adsorption behavior of HPMC on the silica surfaces.1.For the suspensions of fumed silica particles dispersed in HPMC solution, rheopexy and overshooting were observed in transient shear stress, showing the existence of aggregated structure in the dispersions.Evidence of the aggregated structures in the silica suspensions was supported by observations of a bomb at low shear rate in plots of the steady-state shear stress against shear rate (flow curves) as well as a second plateau in the frequency dependence of storage modulus. Moreover, partial desorption of HPMC from the silica particles did not reduce the bomb and the second plateau.2.For the suspensions of colloidal silicas dispersed in HPMC solution, transient shear stress showed no time dependence. The flow curves only indicated shear thinning. The loss modulus was larger than the storage one in the entire range of frequency except for higher frequency, showing liquid-like viscoelastic behavior. The difference in the rheological behavior of the silica suspensions stemmed from the stability of the silica particles : the fumed silicas were aggregated due to their gelling character inwater, whereas the colloidal silicas were electrostatically stable.

在这项研究中，研究了HPMC在二氧化硅表面上HPMC的吸附行为的结合，研究了硅质颗粒分散在水溶液中的流变特性。分散体中的聚集结构。二氧化硅悬浮液中的骨料结构的证据是通过在稳态剪切应力抗剪切速率（流动曲线）以及储存模量频率依赖性的稳态剪切应力（流量曲线）的稳态剪切应力（流量曲线）中的低剪切速率的观察支持。此外，从二氧化硅颗粒中的HPMC部分解吸并不能减少炸弹和第二个高原。2。对于分散在HPMC溶液中的胶体硅的悬浮液，瞬态剪切应力没有时间依赖。流曲线仅表示剪切变薄。损耗模量大于整个频率范围内的存储模量，但较高的频率除外，显示出液体样的粘弹性行为。二氧化硅悬浮液的流变行为的差异源于二氧化硅颗粒的稳定性：烟雾硅的凝聚是由于其胶凝特性在水中，而胶体硅的静电稳定。

项目成果

川口正美: "Polymer adsorption at solid-liquid interfaces" Advances in Colloid and Interface Science. 37. 219-227 (1992)

Masami Kawaguchi：“固液界面的聚合物吸附”胶体和界面科学进展 37. 219-227 (1992)。

M.Kawaguchi, Y.Sakata, S.Anada, T.Kato, and A.Takahashi: ""Kinetics of competitive adsorption of polystirene chains at porous silica surface"" Langmuir. 10. 538-541 (1994)

M.Kawaguchi、Y.Sakata、S.Anada、T.Kato 和 A.Takahashi：“多孔二氧化硅表面聚苯乙烯链竞争吸附的动力学”Langmuir。

川口正美: "Rheological Properties of silica suspensions in aqueous cellulose derivatitive solutions" Chemical Engineering Science. 48. 393-400 (1993)

Masami Kawaguchi：“纤维素衍生物水溶液中二氧化硅悬浮液的流变特性”《化学工程科学》48. 393-400 (1993)。

中井康弘: "Transient and Steady-state Rheology of Silica Suspensions in Hydroxypropyl(methyl) Cellulose Solutions" Journal of Chemical Society.Faraday Transition. 89. 2467-2472 (1993)

Yasuhiro Nakai：“羟丙基（甲基）纤维素溶液中二氧化硅悬浮液的瞬态和稳态流变学”《化学学会杂志》。法拉第转变。89。2467-2472（1993）

S.Anada and M.Kawaguchi: ""Effect of surface geometry on polymer adsorption. 3. Competitive adsorption at the rheta point"" Macromolecules. 25. 6824-6828 (1992)

S.Anada 和 M.Kawaguchi：“表面几何形状对聚合物吸附的影响。