Amphiphilic Block Copolymers: Self Assembly And Applications by P. Alexandridis, B. Lindman

By P. Alexandridis, B. Lindman

It's the trust of the editors of this ebook that the popularity of block copolymers as being amphiphilic molecules and sharing universal positive aspects with different well-studied amphiphiles will end up helpful to either the surfactant and the polymer groups. An target of this publication is to bridge the 2 groups and cross-fertilise different fields. To this finish, top researchers within the box of amphiphilic block copolymer self-assembly, a few having a heritage in surfactant chemistry, and others with polymer physics roots, have agreed to affix forces and give a contribution to this book.The ebook includes 4 entities. the 1st half discusses theoretical issues at the back of the block copolymer self-assembly in resolution and within the soften. the second one half presents case stories of self-assembly in numerous periods of block copolymers (e.g., polyethers, polyelectrolytes) and in several environments (e.g., in water, in non-aqueous solvents, or within the absence of solvents). The 3rd half offers experimental instruments, starting from static (e.g., small perspective neutron scattering) to dynamic (e.g., rheology), which could end up useful within the characterization of block copolymer self-assemblies. The fourth half deals a sampling of present purposes of block copolymers in, e.g., formulations, pharmaceutics, and separations, purposes that are in accordance with the original self-assembly houses of block copolymers.

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The explanation to these phenomena on a molecular level is an interesting subject. In the first case it is generally agreed that the hydrophobic molecule induces a structuring of the water in its vicinity. This structuring is associated with an energetic gain and an entropic cost [4]. Without the structuring process one would have expected that the solution of a hydrophobic substance in water was accompanied by an entropic gain and an energetic cost. If the effect of the ordinary solution process and the structuring is added, then one obtains that for the entire solvation process at room temperature there is an entropic cost but that the process occurs with only very small changes in energy.

However, substantial effort has been devoted to the selfassociation into micelles and liquid crystalline phases of short chain molecules. These simulations have been performed either on a lattice or off-lattice with simple spring-bead models. Moreover, the structure and dynamics of single miceUes as well as mono- and bilayers have been investigated with (nearly) fully atomistic models [47-49], but in these studies the simulations were started from already assembled systems. 1. Micellar structure and the cmc Pratt and coworkers performed early Monte Carlo simulations of single micelles formed by a fixed number of A3B and AsB chains on a diamond lattice [50,51 ].

The remaining two approaches are more fundamental in the sense that they explicitly contain chain molecules and that they are based on configurational averages. In the numerical self-consistent mean-field models, properties of the system are calculated for a given morphology. Volume fraction profiles appear as a results and are hence not a part of the assumption. In addition to the properties given above, predictions of the interfacial width and interfacial tension are made, and information on the distribution of individual segments is provided.

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