Polymer tubelike

The porous membrane templates described above do exhibit three-dimensionality, but with limited interconnectedness between the discrete tubelike structures. Porous structures with more integrated pore—solid architectures can be designed using templates assembled from discrete solid objects or su-pramolecular structures. One class of such structures are three-dimensionally ordered macroporous (or 3-DOM) solids, which are a class of inverse opal structures. The design of 3-DOM structures is based on the initial formation of a colloidal crystal composed of monodisperse polymer or silica spheres assembled in a close-packed arrangement. The interconnected void spaces of the template, 26 vol % for a face-centered-cubic array, are subsequently infiltrated with the desired material. 

The modern approach to constitutive equations for melts and concentrated solutions has evolved from the reptation idea popularized by de Gennes and Doi and Edwards. In this picture, the mobility of a polymer chain in any direction except along the backbone is visualized as constrained to an imaginary tubelike region formed by the entanglements with the neighboring chains, which serve to restrict... 

Ground-State energy per monomer mm//V of tubelike polymers with nine monomers as a function of the global radius of curvature constraint p (solid line). For comparison, the energy curve of the perfect a-helix is also plotted (dashed line). The inset shows that for a small interval around p 0.686, the ground-state structure is perfectly o -helical. Also depicted are side and top views of putative ground-state conformations for various exemplified values of p. For the purpose of clarity, the conformations are not shown with their natural thickness. From [243]. 

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