Macromolecule flexible

Bastiaansen, C.W.M. (1997) High-modulus and high-strength fibres based on flexible macromolecules, in Processing of Polymers, ed. Meijer, H.E.H. Materials Science and Technology, A Comprehensive Treatment, vol. 18, eds. Cahn, R.W., Haasen, P. and Kramer, E.J. (VCH, Weinheim) p. 551. 

Wunderlich, B. and Baur, H. Heat Capacities of Linear High Polymers. Vol. 7, pp. 151-368. Wunderlich, B. and Grebowic2, JThermotropic Mesophases and Mesophase Transitions of Linear, Flexible Macromolecules. Vol. 60/61, pp. 1-60. 

Garcia de la Torre J., Carrasco B. 1999. Universal size-independent quantities for the conformational characterization of rigid and flexible macromolecules. Progress in Colloid Polymers Science 113, 81-86. 

Diffusion of flexible macromolecules in solutions and gel media has also been studied extensively [35,97]. The Zimm model for diffusion of flexible chains in polymer melts predicts that the diffusion coefficient of a flexible polymer in solution depends on polymer length to the 1/2 power, D N. This theoretical result has also been confirmed by experimental data [97,122]. The reptation theory for diffusion of flexible polymers in highly restricted environments predicts a dependence D [97,122,127]. Results of various... 

JG Kirkwood, J Riseman. The intrinsic viscosities and diffusion constants of flexible macromolecules in solution. J Chem Phys 16 565-573, 1948. 

The transitions of the coil-globule type were considered not only in the usual space, but also in the space of monomeric units orientation, where such transition is equivalent to the nematic liquid crystal ordering [60,61]. Such an approach using the formalism developed by I.M. Lifshitz has led to the creation of the theory of liquid crystal ordering in the solutions of semi-flexible macromolecules [62,63]. 

The transformation from spheres to cyhnders is a peculiar example for the self-adjustment of the molecular conformation. The switching shape can be regarded as an example for the principle of quasi equivalency established by A. Klug for the self-assembly of biomolecules and viruses [145] for the sake of an improved intermolecular packing, the molecules adopt a conformation different from the minimum energy one. This also demonstrates that shape control does not mean a fully constrained structure. Similar to biomolecules, the combination of flexible macromolecules and self-assembly principles is a powerful strategy for preparation of molecules with well-defined but switchable shape [23]. 

Proper use of LALLS to measure polymer molecular weight requires a dilute solution of optically isotropic flexible macromolecules whose dimensions are of the same... 

Champion, J.V., Davis, I. D. Light scattering by solutions of flexible macromolecules subjected to flow. J. Chem. Phys. 52, 381-385 (1970). 

Obviously, the enthalpy gain can compensate for some unfavorable change in entropy. At a suitable value of adsorption energy, flexible macromolecules may reptate into narrow pores. Polystyrene of molar mass 173,000 g/mol and coil diameter 30 nm is reported to be capable of entering pores of silica gel with 10 nm average pore diameter8). This penetration will certainly be a slow process. It often has been observed that the amount of polymer adsorbed by porous adsorbents slowly increases over a protracted period of time. This may be due to similar effects. 

Thermotropic Mesophases and Mesophase Transitions of Linear, Flexible Macromolecules... 

Mesophase materials of linear, flexible macromolecules have gained attention only more recently, when it was found that parallel molecular orientation is easily achieved in some of these mesophases. This orientation can lead to high modulus and tensile strength 6). Presently there exists a certain amount of confusion in the literature about the description, properties, and nomenclature of these macromolecular mesophases and their place in the arrangement of all matter. Even for the better understood small-molecule mesophases there are some problems in the description of glasses and in the separation of orientational and conformational disorder. Also, the distinction between mesophases based on molecular structure and on super-molecular structure is not always made. We will try in this review to clarify some of these points. 

---