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菜园P孩儿木虫 (正式写手)
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[求助]
求帮忙翻译一段高分子化学论文……
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The end-linking technique allows an accurate control over the equilibrium structure of polymer networks. In agreement with previous experiments in the literature [15,37], we observe that network structure can be nicely described through a classical mean field model. In addition, within the low concentration regime studied here, where there are no self-entanglements among defects, equilibrium properties depends on the concentration of defects, while the relaxation spectrum is strongly affected by the average molar mass of the pendant material. Polymer networks unavoidably contain defects that dictate their long time dynamics. Among the wide variety of structural defects in a network, high molar mass pendant chains control the terminal relaxation dynamics. For pendant chains, similarly to entangled star polymer melts, the reptation process is inhibited and the relaxational dynamics becomes driven by the arm retraction potential. However, since dynamic dilution effect, that reduces the strength of the arm retraction potential in star melts, is absent; in polymer networks the dynamics becomes drastically slower. Thus, the stress relaxation process occurs under the action of the strong arm retraction potential derived by Pearson and Helfand. In agreement with previous experiments we have observed that long time relaxation modulus can be described by the Thirion- Chasset equation and the constants in this empirical equation can be related to a parameters free theory that only requires knowing the number of entanglements per pendant chain, its concentration, and the Rouse time among entanglements. |
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