𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Aggregation behavior of MPEG-PCL diblock copolymers in aqueous solutions and morphologies of the aggregates

✍ Scribed by Chengfei Lu; Shengrong Guo; Li Liu; Yaqiong Zhang; Zonghai Li; Jianren Gu

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
607 KB
Volume
44
Category
Article
ISSN
0887-6266

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Poly(ethylene glycol)‐b‐polycaprolactone (MPEG‐PCL) diblock copolymers were synthesized via a ring‐opening polymerization of ε‐CL monomers with MPEG as an initiator. Their solubilities and apparent critical micelle concentrations (CMC) in aqueous solution were investigated as well as the determination of the micellar hydrodynamic diameter using dynamic light scattering (DLS). As PCL block length increased, the solubility and CMC decreased while diameters of micelles increased. The gel–sol transition behaviors were investigated using a vial tilting method. Aqueous solutions of copolymers undergo a gel to sol transition with increase in temperature when their polymer concentrations are above a critical gel concentration (CGC). The CGC of the copolymers and gel–sol transition temperature are influenced by the PCL chain length. The tapping mode AFM was performed by imaging the freeze‐dried deposits from the copolymer solutions on mica to investigate a process from free chains to micelles and to gel. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 3406–3417, 2006

📜 SIMILAR VOLUMES

Multiple morphologies of the aggregates
Multiple morphologies of the aggregates from self-assembly of diblock copolymer with relatively long corona-forming block in dilute aqueous solution
✍ Fabao Zhao; Jianping Sun; Zhilei Liu; Liang Feng; Jiwen Hu 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 211 KB

## Abstract Reported here is self‐assembly behavior in selective solvent of diblock copolymers with relatively long corona‐forming block compared to core‐forming block. Three diblock copolymers, poly(ethylene glycol) monomethyl ether‐__b__‐poly(methacryloyl‐L‐leucine methyl ester), also denoted as

The Aggregation Behavior of Poly(ethylen
The Aggregation Behavior of Poly(ethylene oxide)-Poly(methyl methacrylate) Diblock Copolymers in Organic Solvents
✍ K. Edelmann; M. Janich; E. Hoinkis; W. Pyckhout-Hintzen; S. Höring 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 148 KB 👁 2 views

The authors are indebted to Prof. E. Straube (Halle), Prof. K.-F. Arndt (Dresden) and Prof. J. Kressler (Merseburg) for helpful discussions concerning scattering measurements. Thanks to Chr. Sommer for support in static light scattering experiments.

Molecular size and aggregation behavior
Molecular size and aggregation behavior of Erwinia gum in aqueous solution
✍ Lina Zhang; Xiaojuan Xu; Mei Zhang; Jinghua Chen; Diya Meng; Liwei Ren; Hideki I 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 145 KB 👁 2 views

Erwinia (E) gum, a stabilizer and thickening agent of food, is composed of glucose, fucose, galactose, and glucuronic acid (1 : 0.1 : 0.05 : 0.3 by molar ratio). The apparent weight-average molecular weight M w and intrinsic viscosity [] in 0.2 M NaCl aqueous solution were measured to be 7.83 ϫ 10 5