Photon correlation spectroscopy of poly(ethyl methacrylate) near the glass transition
Photon correlation spectroscopy of poly(ethyl methacrylate) near the glass transition
复制标题
聚甲基丙烯酸乙酯在玻璃化转变附近的光子相关光谱
DOI：
10.1080/00222348008241851
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发表时间：
1980
期刊：
影响因子：
--
通讯作者：
C. P. Lindsey
中科院分区：
文献类型：
--
作者：
G. Patterson;J. R. Stevens;C. P. Lindsey
用光子相关光谱法研究了聚甲基丙烯酸乙酯在70 ~ 150℃范围内的反应。纵向密度波动的松弛函数是高度非指数的，并且随着样品冷却而急剧改变形状。结果表明，存在多个具有不同表观活化能的弛豫过程。当温度在Tg附近变化5°C时，弛豫时间平均变化十年。在玻璃化转变附近弛豫时间分布的宽度至少为80年。
Abstract Poly(ethyl methacrylate) has been studied by photon correlation spectroscopy in the temperature range 70–150°C. The relaxation function for longitudinal density fluctuations is highly nonexpon-ential and changes shape dramatically as the sample is cooled. The results indicate that there are multiple relaxation processes which have different apparent activation energies. The average relaxation time changes by a decade with a 5°C change in temperature near Tg. The breadth of the distribution of relaxation times near the glass transition is at least eight decades.