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Nonionic Block Copolymer Wormlike Micelles
| Content Provider | Scilit |
|---|---|
| Author | Won, You-Yeon Bates, Frank S. |
| Copyright Year | 2007 |
| Description | Book Name: Giant Micelles |
| Abstract | Block copolymers are macromolecules composed of chemically distinct blocks that are covalently linked together. Molecular architectures that can be produced using the simplest combination of two types of monomers (A and B) include diblock (A-B) and triblock (A-B-A) copolymers. Chemical dissimilarity between the A and B blocks often confers an amphiphilic character to this class of materials. Particularly, there is a subset of block copolymers that contain both hydrophilic and hydrophobic blocks, and these compounds can be regarded as macromolecular analogs of conventional small molecule surfactants. A typical hydrophobic segment of a small molecule surfactant contains a linear hydrocarbon 418chain of oligomeric methylene $(-CH_{2}$-) of length usually less than twenty repeat units. Ethylene oxide $(-CH_{2}-CH_{2}$-O-) moieties commonly form the hydrophilic portion of many nonionic surfactants including the family referred to as $C_{m}EO_{n}$ (oligo(ethylene oxide) monoalkyl ether), where the subscripts m and n denote the numbers of methylene and ethylene oxide repeat units, respectively. The past decade has witnessed great advances in the investigation and application of polymeric surfactants thanks to the development of synthetic methods for the preparation of model poly(ethylene oxide)-poly(hydrocarbon) materials such as poly(ethylene oxide)-poly(styrene) $(PEO-PS),^{ 1 }$ poly(ethylene oxide)-poly(ethyl ethylene) $(PEO-PEE),^{ 2 }$ poly(ethylene oxide)-poly(isoprene) $(PEO-PI),^{ 3 }$ and poly(ethylene oxide)-poly(butadiene) $(PEO-PB).^{ 4 }$ Advances in the field of polymer chemistry, in fact, allow a wealth of other monomers to be used for the preparation of polymeric surfactants; see Refs. 5 and 6 for detailed reviews on the synthesis of macromolecular surfactants. Poly(acrylic acid)-poly(styrene) $(PAA-PS)^{ 7 }$ and poly(acrylic acid)-poly(butadiene) $(PAA-PB)^{ 8 }$ are two examples among many available in the category of ion-containing polymeric surfactants. Commercial products include PEO-based diblock and triblock copolymers having poly(propylene oxide) (PPO) as the hydrophobic component, which were developed more than 50 years $ago.^{ 9 }$ New polymeric surfactants continue to emerge, expanding the arsenal of amphiphiles available to researchers and industrialists working in this field. |
| Related Links | https://content.taylorfrancis.com/books/download?dac=C2009-0-10072-3&isbn=9780429124969&doi=10.1201/9781420007121-14&format=pdf |
| Ending Page | 452 |
| Page Count | 36 |
| Starting Page | 417 |
| DOI | 10.1201/9781420007121-14 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2007-05-30 |
| Access Restriction | Open |
| Subject Keyword | Book Name: Giant Micelles Polymer Science Hydrophobic Triblock Contains Copolymers Ch2 Diblock Nonionic Macromolecular Amphiphiles Monomers |
| Content Type | Text |
| Resource Type | Chapter |
