Supramolecular Polymers

doi:10.1201/9780824746438

Cited by 144 publications

(51 citation statements)

References 3 publications

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“…Thus, supramolecular chemistry opens new perspectives in materials science toward an area of supramolecular materials, ''smart'' materials whose features depend on molecular information. For instance, liquid-crystalline polymers of supramolecular nature have been obtained by the self-assembly of complementary subunits (56)(57)(58).…”

Section: Functional Supramolecular Materialsmentioning

confidence: 99%

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Toward complex matter: Supramolecular chemistry and self-organization

Lehn

2002

Proc. Natl. Acad. Sci. U.S.A.

1,254

759

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Section: Functional Supramolecular Materialsmentioning

confidence: 99%

“…A rich domain emerges from the combination of polymer chemistry with supramolecular chemistry defining a supramolecular polymer chemistry (56)(57)(58). It involves the designed manipulation of molecular interactions (hydrogen bonding, donor-acceptor effects, etc.)…”

Section: Functional Supramolecular Materialsmentioning

confidence: 99%

Toward complex matter: Supramolecular chemistry and self-organization

Lehn

2002

Proc. Natl. Acad. Sci. U.S.A.

1,254

759

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“…Focusing on a specific class of materials, polymers, the pathway leads from supramolecular polymers (6)(7)(8) to dynamic covalent polymers (see ref. 5, pp.…”

mentioning

confidence: 99%

Dynamers: Polyacylhydrazone reversible covalent polymers, component exchange, and constitutional diversity

Skene

Lehn

2004

Proc. Natl. Acad. Sci. U.S.A.

302

195

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Component exchange in reversible polymers allows the generation of dynamic constitutional diversity. The polycondensation of dihydrazides with dialdehydes generates polyacylhydrazones, to which the acylhydrazone functionality formed confers both hydrogen-bonding and reversibility features through the amide and imine groups, respectively. Polyacylhydrazones are thus dynamic polyamides. They are able to reversibly exchange either one or both of their repeating monomer units in the presence of different monomers, thus presenting constitutional dynamic diversity. The polymers subjected to monomer exchange͞interchange may be brought to exhibit physical properties vastly different from those of the original polymer. The principle may be extended to other important classes of polymers, giving access, for instance, to dynamic polyureas or polycarbamates. These reversible polymers are therefore able to incorporate, decorporate, or reshuffle their constituting monomers, namely in response to environmental physical or chemical factors, an adaptability feature central to constitutional dynamic chemistry.constitutional dynamic chemistry ͉ reversible polymers ͉ dynamic materials B lending supramolecular chemistry with materials science defines a field of supramolecular materials that rests on the explicit implementation of intermolecular interactions in the design and synthesis of novel materials presenting novel properties.Because supramolecular chemistry is by nature a dynamic chemistry in view of the lability of the noncovalent interactions connecting the molecular components of a supramolecular entity, supramolecular materials are by nature dynamic materials (1-3).Importing such dynamic features, characteristic of supramolecular chemistry, into molecular chemistry implies looking at molecules as labile entities, in contrast to the usual longing for stability, thus opening novel perspectives to covalent chemistry. It requires searching for reversible reactions that allow the making and breaking of covalent bonds, preferentially under mild conditions. These developments are embodied in the recent emergence of dynamic combinatorial chemistry as a powerful means for generating dynamic, effector-responsive molecular diversity (2, 4).Thus, on both the supramolecular and molecular levels, dynamic materials may be defined as materials whose constituents are linked through reversible connections (noncovalent or covalent) and are able to undergo continuous reorganization through assembly͞disassembly processes, incorporation, extrusion, or reshuffling of components in a given set of conditions, usually under thermodynamic control (1, 2).The resulting constitutional plasticity defines a constitutional dynamic chemistry (3) encompassing both covalent molecular (2, 5) and noncovalent supramolecular entities.Focusing on a specific class of materials, polymers, the pathway leads from supramolecular polymers (6-8) to dynamic covalent polymers (see ref. 5, pp. 902-915). One may designate under the term, Dynamers (7), both the polymers that...

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“…[1][2][3][4][5][6][7] In every organogel, huge supramolecular molecules or polymers are developed by gelators via relatively strong inter-molecular interactions, such as hydrogen bonding [8][9][10][11] and π-π stacking. [12][13][14] Gelator molecules, such as trialkyl-1,3,5-benzenetricarboxamides, that possess 3-fold rotation symmetry are highly effective in the formation of supramolecular architecture, especially for the construction of one-dimensional, enormously long columnar supramolecular structures in non-polar media.…”

Section: Introductionmentioning

confidence: 99%

Creep Behavior of a Maxwell Element Type Supramolecular Polymeric System

Shikata

Sakamoto

Hanabusa

2004

J. Soc. Rheol., Jpn

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Creep and creep recovery behavior was investigated for a supramolecular polymeric system consisting of N,N',N"-tris(3,7-dimethyloctyl)benzene-1,3,5-tricarboxamide and n-decane. In the linear viscoelastic regime, the system shows behavior well described with a Maxwell element having a set of a relaxation time (τ) and strength (G N ). The creep behavior of the system in the linear regime is simple; after showing the instantaneous value (J (0) ). In this regime, creep recovery (J R (t)) reaches a constant value after showing the recoverable compliance (J R = G N −1). In the nonlinear regime at high shear stresses, the creep behavior is classified into two categories depending on t. In a short time region, the value of J(0) and a viscosity (η (0) ) determined from the initial slope of J(t) decrease with increasing shear stress (σ). These mean that the system becomes harder and less viscous with increasing σ. On the other hand, the creep behavior of the system is characterized by the steady state viscosity (η e ) and J R in the steady flow state. The η e value decreases with increasing σ, and J R exhibits remarkable stepwise increase at a shear rate identical with the reciprocal of τ.

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Supramolecular Polymers

Cited by 144 publications

References 3 publications

Toward complex matter: Supramolecular chemistry and self-organization

Toward complex matter: Supramolecular chemistry and self-organization

Dynamers: Polyacylhydrazone reversible covalent polymers, component exchange, and constitutional diversity

Creep Behavior of a Maxwell Element Type Supramolecular Polymeric System

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