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- W2021306212 abstract "Measurements of low frequency Raman scattering and low temperature specific heat between 2 and 20 K have been performed in two glassy, heterocyclic polymer networks. The effective network densities of heterocyclic polymer networks are varied by changing the ratio of bi- and mono-functional isocyanate monomers, leaving the overall chemical structure essentially unchanged. A boson peak at ∼ 20 cm−1 characterizes the Raman spectra at room temperature of both samples. Below 10 K, the specific heats deviate from a cubic temperature dependence, as predicted by the Debye theory, and reveal an excess specific heat, having the shape of a well-defined peak in a C p/T 3 plot with a maximum at ∼ 5 K. The increase in effective network density is accompanied by a slight decrease in excess specific heat. These observations have been explained in terms of additional low-energy vibrations associated with the monomers building the polymer networks." @default.
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- W2021306212 date "2008-11-21" @default.
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- W2021306212 title "Low temperature specific heat of heterocyclic polymer networks: Effect of network density" @default.
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- W2021306212 doi "https://doi.org/10.1080/14786430802459545" @default.
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