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New PDF release: Supramolecular Polymers

By Alberto Ciferri

ISBN-10: 0824702522

ISBN-13: 9780824702526

Specializes in an in depth research of the formation and homes of linear, planar, and 3D polymer assemblies stabilized through supramolecular interactions, together with examples of covalently bonded polymers displaying novel supramolecular results.

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Sample text

From Ref. ) based on single H-bonds (cf. Fig. 2A) and presented evidence supporting a MSOA mechanism. The supramolecular polymerization of tropomyosin [102] is also satisfactorily represented by Eq. (1). Fig 2C) appear also to result from a step polymerization process characterized by the lack of reaction products (other than polymer) and by the unusually large dimerization constant of ureidopyrimidone (K Ͼ 10 6 M Ϫ1 in chloroform). It is easy to show that values of p [Eq. 99 can be expected under equilibium conditions [6].

16) represent growth due to MSOA (L Ͻ P). As a result of interassembly cooperative growth, the length attains at ν ϭ ν i a value reflecting the semirigidity of the assembly. When ν Ͼ ν i decoupling of growth does not allow the occurrence of values of L much larger than P, although some further lengthening upon increasing concentration above ν i is predicted [20,94,95]. For polydisperse molecular polymers, fractions with L Ͼ P are known to enter the mesophase at an asymptotic value of the critical conventration [101].

The authors interpret the formation of S-layers as a two-dimensional crystallization [138]. Although no thermodynamic analysis of the system has yet been made, Sleytr and coworkers’ interpretation appears to be quite consistent with the general thermodynamic considerations discussed above. As schematized in Fig. 15C, an equatorial distribution of weak binding sites can stabilize a planar assembly of quasispherical units. On the other hand, a three-dimensional assembly of spheres would be stabilized if a north–south distribution of complementary sites also occurred.

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Supramolecular Polymers by Alberto Ciferri

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