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 e-book that the popularity of block copolymers as being amphiphilic molecules and sharing universal gains with different well-studied amphiphiles will turn out precious to either the surfactant and the polymer groups. An objective of this publication is to bridge the 2 groups and cross-fertilise different fields. To this finish, best 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 hitch forces and give a contribution to this book.The publication 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 experiences of self-assembly in numerous periods of block copolymers (e.g., polyethers, polyelectrolytes) and in numerous environments (e.g., in water, in non-aqueous solvents, or within the absence of solvents). The 3rd half provides experimental instruments, starting from static (e.g., small attitude neutron scattering) to dynamic (e.g., rheology), which may turn out beneficial 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, functions that are in accordance with the original self-assembly homes of block copolymers.

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5) where 13= l/(kT) with k being Boltzmann's constant and T the temperature. In model I, a constant volume fraction of the B block is assumed and the uniformly stretching assumption gives similarly ldef = p N'~/2a Regarding model the blob picture is used again. 7') The aggregation number can now determined by minimization of the free energy per polymer chain, F/p. 10') ~core t~shell where (NA'2p) u6 << 1 has been used corresponding to *def << l def 9 Thus, in the large core limit, the aggregation number is determined from the balance of the deformation free energy in the core and the inteffaeial free energy; the former tending to reduce p and the latter tending to increase p.

The lattice approach has been used to examine the effect of a polydisperse PEO-PPO-PEO triblock copolymer on the location of the cmc [39]. The polydisperse sample were represented by several components selected from the Schulz-Zimm distribution. Both the case of only a mass polydispersity and the case of mass-and-composition polydispersity were considered. Figure 11 shows how the location of the cmc changes as a function of the polydispersity ratio Mm/Mn for (EO)37(PO)56(EO)37 triblock copolymer (Pluronic P105) in aqueous solution.

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