Brillouin Scattering and Ultrasonic Study on an Epoxy Prepolymer
Brillouin Scattering and Ultrasonic Study on an Epoxy Prepolymer
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环氧预聚物的布里渊散射和超声研究
DOI：
10.1143/jjap.36.2976
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发表时间：
1997
影响因子：
1.5
通讯作者：
J. Krüger
中科院分区：
文献类型：
--
作者：
M. Matsukawa;N. Ohtori;I. Nagai;K. Bohn;J. Krüger
利用布里渊散射和超声脉冲光谱技术研究了一种常见的环氧预聚物的弹性性质与温度的关系。在GHz区，布里渊频移曲线在250 K附近出现一个尖锐的弯折，这与DSC观察到的Tg相一致。由布里渊频移计算得到的D90 R函数在350 K附近有明显的色散，在此温度下观察到布里渊线宽的宽峰。在MHz区域，超声波衰减也在285 K附近出现峰值。假设这些变化是玻璃化转变区的α弛豫引起的，结合完全固化环氧树脂的α弛豫讨论了峰的频率-温度行为。
The temperature dependence of elastic properties in a common epoxy prepolymer was investigated using Brillouin scattering and ultrasonic pulse spectroscopy. In the GHz region, the Brillouin shift frequency curve showed a sharp kink at about 250 K, which was in good accordance with T g observed by DSC. The D 90R function calculated from the Brillouin shift frequency showed a clear dispersion at temperatures near 350 K, at which a broad peak of the Brillouin linewidth was observed. In the MHz region, ultrasonic wave attenuation also showed a peak near 285 K. Assuming that these changes result from the α relaxation in the glass transition region, the frequency-temperature behavior of the peaks was discussed in connection with the α relaxation in fully cured epoxy resin.