𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Effect of Shear Flow on the Polymeric Gels Formed by Macroscopic Phase Separation

✍ Scribed by Moon Jeong Park; Kookheon Char

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
341 KB
Volume
25
Category
Article
ISSN
1022-1336

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Summary: Shear‐induced phase behavior of poly(ethylene oxide‐b‐(DL‐lactic acid‐co‐glycolic acid)‐b‐ethylene oxide) (PEO‐PLGA‐PEO) triblock copolymers in water is investigated using rheology and small‐angle neutron scattering equipped with an in situ Couette shear cell. For gels formed by the macroscopic phase separation, the steady shear experiment reveals that the flow‐induced anisotropy on a nanometer length scale at a critical shear rate and the phase separation on a larger length scale are successively induced with a further increase in the shear rate. In particular, the hard gels show a memory effect inscribed by a pre‐high shear in contrast to the soft gels.

2D SANS patterns clearly show the memory effect of the hard gels at a pre‐high shear.

image2D SANS patterns clearly show the memory effect of the hard gels at a pre‐high shear.

📜 SIMILAR VOLUMES

Effects of the shear flow on a homogeneo
Effects of the shear flow on a homogeneous polymeric reaction
✍ Fan Xie; Chixing Zhou; Wei Yu 📂 Article 📅 2006 🏛 John Wiley and Sons 🌐 English ⚖ 119 KB 👁 2 views

## Abstract The reaction kinetics of the postamidation of polyamide 6 in the melt was studied by a new rheological method, and the reaction rate constant was calculated to be about 0.087 kg/mol min at 250°C. To study the effects of the shear flow on a homogeneous polymeric reaction, a more practica

The Chain Stretching Effect on the Morph
The Chain Stretching Effect on the Morphology and Rheological Properties of Phase-Separating Polymer Blends Subjected to Simple Shear Flow
✍ Kaifu Luo; Hongdong Zhang; Yuliang Yang 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 372 KB

## Abstract **Summary:** The spinodal decomposition of a binary mixture subjected to simple shear flow is investigated in the framework of the modified time‐dependent Ginzburg‐Landau (TDGL) equation with an external velocity term. The domain growth and related rheological properties of a binary mix

Effect of Pharmaceutically Acceptable Gl
Effect of Pharmaceutically Acceptable Glycols on the Stability of the Liquid Crystalline Gels Formed by Poloxamer 407 in Water
✍ Rouja Ivanova; Björn Lindman; Paschalis Alexandridis 📂 Article 📅 2002 🏛 Elsevier Science 🌐 English ⚖ 190 KB

The ability of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) block copolymers (Poloxamers) to form "gels" (lyotropic liquid crystalline structures) in water is of interest to pharmaceutical applications. In such applications the presence of polar organic solvents is o

Effect of the Form of the Quaternary Amm
Effect of the Form of the Quaternary Ammonium Ion on the Ion-Pair Phase Separation Phenomenon with Perfluorooctanoic Acid
✍ Go Yokohashi; Shukuro Igarashi 📂 Article 📅 1997 🏛 Elsevier Science 🌐 English ⚖ 96 KB

FT-IR. Two types of quaternary ammonium bromides (i.e., [4r4r4r4] and ooctanoic acid; ion-pair association; phase separation pheno-[1r1r1r13]) were used as received from Tokyo Kasei Company and Wako menon. Pure Chemical Company, respectively. Quaternary ammonium bromide aqueous solution 1 mol dm 03

Effect of gamma irradiation on the metal
Effect of gamma irradiation on the metal sorption and separation of some divalent metals by some new polymeric bifunctional resins
✍ A. M. El-Naggar; A. S. Emara; S. G. Abd Alla 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 199 KB 👁 2 views

The metal sorption and separation of some divalent metals from solutions of varying acidity by a new series of gamma-irradiated ionic polymer resins have been investigated. Three polymeric resins, viz., phosphonic acid, phosphonate monoethyl ester, and phosphonate diethyl/monoethyl ester, were used