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arXiv 0806.1486cond-mat.soft
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聚合对玻色子峰的影响,从液相到玻璃相

Effect of Polymerization on the Boson Peak, from the Liquid to Glassy Phase

S. Caponi, S. Corezzi, D. Fioretto, A. Fontana, G. Monaco, F. Rossi

摘要:

拉曼散射测量用于跟踪反应性环氧-胺混合物在等温聚合过程中振动态密度的改变。结合布里渊光和非弹性X射线散射测量,我们分析了玻色子峰和德拜能级的变化,而系统通过从流体到玻璃相时,增加组成分子之间的共价键的数量。我们发现,玻色子峰的位移和强度的下降完全解释了整个反应的弹性介质的修改。令人惊讶的是,键引起的结构修改不影响德拜能级以上的相对过剩状态。

英文摘要:

Raman scattering measurements are used to follow the modification of the vibrational density of states in a reactive epoxy{amine mixture during isothermal polymerization. Combining with Brillouin light and inelastic x-ray scattering measurements, we analyze the variations of the boson peak and of the Debye level while the system passes from the uid to a glassy phase upon increasing the number of covalent bonds among the constituent molecules. We find that the shift and the intensity decrease of the boson peak are fully explained by the modification of the elastic medium throughout the reaction. Surprisingly, bond-induced modifications of the structure do not affect the relative excess of states over the Debye level.

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