氰酸酯树脂的Specific heat、导热性和磁化率-常用环氧树脂的替代品
Specific heat, thermal conductivity, and magnetic susceptibility of cyanate ester resins --- An alternative to commonly used epoxy resins
摘要：
在低温实验中，树脂有许多应用，如胶水或热绝缘体和电绝缘体。氰酸酯树脂（CE）是一种高温相容的热固性树脂，其玻璃化转变温度$T_g$为~300 $^\circ$ C。最近，我们发现CE也可以承受低温而不产生微裂纹，通过测量$^4$ He渗透率。在这里，我们测量了比热C，热导率κ和磁化率$χ$的不同种类的CE在从室温到0.5 K的C和2 K的其他两个宽的温度范围。不同种类CE的热性质C和κ令人惊讶地彼此一致。我们讨论了CE及其共混物的化学结构和结晶度的基础上测得的热性能。与低温实验中常用的环氧树脂Stycast 1266相比，CE的C大3倍（<= 30 K），κ小4倍（<= 10 K），表明热扩散率小。X值与Stycast 1266一样小，表明其纯度高。我们的研究结果表明，氰酸酯是一个新的选择低温树脂的绝热性能在/用于低温实验。
英文摘要：
In low temperature experiments, resins have many applications as glues or thermal and electrical insulators. Cyanate ester resins (CEs) are a high-temperature compatible thermoset resin whose glass-transition temperature $T_g$ is ~300 $^\circ$C. Recently, we found that CEs also withstand low temperatures without microcracking by measuring $^4$He permeability. Here, we measured specific heat C, thermal conductivity κ, and magnetic susceptibility $χ$ of different kinds of CEs in the wide temperature range from room temperature to 0.5 K for C and 2 K for other two. The thermal properties, C and κ, of different kinds of CEs are surprisingly coincident with each other. We discuss chemical structures and crystallinity of CEs and their blends based on the measured thermal properties. Compared to Stycast 1266, a commonly-used epoxy resin in low temperature experiments, C of CEs is larger by a factor of 3 (<= 30 K), κis lower by a factor of 4 (<= 10 K), indicating the small thermal diffusivity. The χvalues are as small as Stycast 1266, indicative of their high purity. Our results show that cyanate esters are a new option for cryogenic resins with thermal insulative properties in/for low temperature experiments.
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