Abstract
The main features of reversibly gelling systems are reviewed and compared with permanent and entangled networks. Several techniques of characterizing the structure of junction zones are discussed. The necessity of combining the common thermal methods with viscoelastic and light scattering techniques is emphasized, since each technique alone gives only a limited answer.
In a second section, two examples of reversible networks with point-like network junctions are described. These are (i) linear polybutadiene chains which were modified by urazole derivatives and (ii) end-tagged ionomers. Analysis of the viscoelastic moduli in terms of a relaxation spectrum revealed that these gels have no equilibrium shear modulus. Dynamic light scattering exhibited a pronounced slow motion, which is not present in permanent gels, in addition to the common fast motion which is related to the correlation length. The ionomers of one-end tagged polystyrene chains show in cyclohexane inverse micelle formation with an aggregation number of 11–12. The both-end tagged ionomers form clear gels which become liquefied on sonification but are reformed on standing.
Finally, the properties of entangled networks are discussed and compared with reversibly gelling systems. Examination of various polymer systems in semidilute solutions shows that pure entanglement, with no fixed junctions, is very rare. Mostly crosslinks are formed for a short time when a certain concentration is exceeded, and the systems start to display behaviour of association and eventually of reversible gelation.
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Burchard, W., Stadler, R., Freitas, L.L., Möller, M., Omeis, J., Mühleisen, E. (1988). Covalent, Thermoreversible and Entangled Networks: An Attempt at Comparison. In: Kramer, O. (eds) Biological and Synthetic Polymer Networks. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1343-1_1
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DOI: https://doi.org/10.1007/978-94-009-1343-1_1
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