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 gains with different well-studied amphiphiles will end up useful to either the surfactant and the polymer groups. An target of this e-book is to bridge the 2 groups and cross-fertilise the various 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 e-book includes 4 entities. the 1st half discusses theoretical issues at the back of the block copolymer self-assembly in answer and within the soften. the second one half offers case experiences of self-assembly in several sessions 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 perspective neutron scattering) to dynamic (e.g., rheology), which may end up precious within the characterization of block copolymer self-assemblies. The fourth half bargains a sampling of present functions of block copolymers in, e.g., formulations, pharmaceutics, and separations, purposes that are according to the original self-assembly homes of block copolymers.
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Extra resources for Amphiphilic Block Copolymers: Self Assembly And Applications
For polymers that contain more hydrophobic material, as polypropyleneoxide (PPO) with 3 carbon atoms per oxygen, the solubility decreases again with increasing number of carbon atoms per oxygen . The remarkable feature here is not the decreased solubility occurring for PPO and longer chains, but the higher solubility for PEO than for PMO. 45 Several explanations are possible, First we note that the packing conditions in the pure substances may be more favourable in PMO than in PEO and this is also reflected in the higher melting point temperature for PMO.
In an early contribution, de Gennes  considered three terms: (i) the interfacial energy between the core and the corona, (ii) the deformation free energy of the A-block, and (iii) the deformation free energy of the B-block. The subsequent extension of Leibler et al. [ 10] included terms describing the mixing entropy of the solvent and the lyophobic block, the mixing entropy of miceUes with solvent and nonassembled block copolymers, and the free energy of the homogeneous reference solution. Later Munch and Gast [ 11] extended the same theory to copolymer with different block sizes, and they also investigated the phase equilibrium between micelles and lamellar phases.
In the small core limit, the limitation of the growth of the micelle is, however, governed by the increased free energy of the blocks in the shell instead of in the core. 2. Solubilization in block copolymer micelles The self-assembly of the block copolymers creates an environment in the core which is different from that in the solution. Solutes not soluble in the solvent can be solubilized (dissolved) in the core, and hence the solubility of a solute in a system can significantly be enhanced by the presence of block copolymers.
Amphiphilic Block Copolymers: Self Assembly And Applications by P. Alexandridis, B. Lindman