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

By P. Alexandridis, B. Lindman

It's the trust of the editors of this booklet that the popularity of block copolymers as being amphiphilic molecules and sharing universal positive factors with different well-studied amphiphiles will end up valuable to either the surfactant and the polymer groups. An goal of this booklet is to bridge the 2 groups and cross-fertilise the several fields. To this finish, prime researchers within the box of amphiphilic block copolymer self-assembly, a few having a historical past in surfactant chemistry, and others with polymer physics roots, have agreed to affix forces and give a contribution to this book.The ebook contains 4 entities. the 1st half discusses theoretical issues in 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), that could turn out worthy 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 keeping with the original self-assembly homes of block copolymers.

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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.

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There are, however, several cases when a deviation from the behaviour is observed and here we will shortly discuss two. The first one occurs for aqueous solutions of hydrophobic material, such as benzene or cyclohexane, and the second is for solutions of polymers of intermediate polarity in polar solvents. 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.

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