Molecular dynamics molten polymers

For non-polymeric or low-molecular-weight molten polymers, the dynamic contact angle is related to the spreading velocity by Tanner s law, given by ... 

In the molecular-kinetic theory of molten polymers there is another approach to the problem which does not employ the notion of engagements. It is based on the analysis of dynamics of individual macromolecules in the medium of their like. In this case the real environment of macromolecules is substituted by a certain averaged continuous medium. The major problem of this approach is to determine the character of this me-... 

Subject areas for the Series include solutions of electrolytes, liquid mixtures, chemical equilibria in solution, acid-base equilibria, vapour-liquid equilibria, liquid-liquid equilibria, solid-liquid equilibria, equilibria in analytical chemistry, dissolution of gases in liquids, dissolution and precipitation, solubility in cryogenic solvents, molten salt systems, solubility measurement techniques, solid solutions, reactions within the solid phase, ion transport reactions away from the interface (i.e. in homogeneous, bulk systems), liquid crystalline systems, solutions of macrocyclic compounds (including macrocyclic electrolytes), polymer systems, molecular dynamic simulations, structural chemistry of liquids and solutions, predictive techniques for properties of solutions, complex and multi-component solutions applications, of solution chemistry to materials and metallurgy (oxide solutions, alloys, mattes etc.), medical aspects of solubility, and environmental issues involving solution phenomena and homogeneous component phenomena. 

The dynamics of molten polymer chains confined between air and a solid and low-molecular probes dissolve in stretched polymers was also studied by H-NMR. Polymer complexes like blends and copolymers have been investigated by H-,... 

Dealy JM, Larson RG (2006) Structure and rheology of molten polymers from polymerization to processability via rheology. Cincinnati Hanser Gardner, Cincinnati Doi M (1981) Molecular dynamics and rheological properties of concentrated solutions of rodlike polymers in isotropic and liquid crystalline phases. J Phys Sci 19 229-243 Doi M, Edwards SF (1978) Dynamics of rod-like macromolecules in concentrated solution. Part 1. J Chem Soc Mol Chem Phys 74 560-570... 

According to initial findings on batch reactors, both in solution and in the molten state, the role of the reaction time in overall yield of the process was too far to be neglected (39) (Fig. 13.10). In order to check that point and also the role stereospecificity could play in the reaction extension, that is the molecular motion possibilities of the macromolecular coreactant, atactic polypropylene was chosen to be modified by grafting maleic anhydride in the same mode as before for isotactic polypropylene. The influence of the temperature of the process had also to be checked because the atactic polymer could not be processed at the same temperature as the isotactic one due to its nature. Results were fully discussed elsewhere (40). Figure 13.11 exhibits the dynamic and unsteady character of the grafting process. 

Endo et al. reported a synthesis ofpoly(l,2-dithiane) (PDT) [151,152] that possibly contained polycatenane structures (Scheme 17.24). A melt polymerization [153] of 1,2-dithiane 84, without initiators, yielded the polymer 85, the NMR analysis of which confirmed the presence of large cyclic structures, which were further verified using by mass spectroscopy and photodegradation analysis. In addition, dynamic viscoelastic measurements showed that the molten state of the polymer 85 has a rabbery plateau, while the Tg of PDT decreased with increasing molecular weight. These observations, which differed from those obtained with the linear PDT analog, provided further evidence for the formation of polycatenane structures. In taking... 

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