Presence of Two Freezing-In Processes Concerning α-Glass Transition in the New Liquid Phase of Triphenyl Phosphite and Its Consistency with “Cluster Structure” and “Intracluster Rearrangement for α Process” Models
Presence of Two Freezing-In Processes Concerning α-Glass Transition in the New Liquid Phase of Triphenyl Phosphite and Its Consistency with “Cluster Structure” and “Intracluster Rearrangement for α Process” Models
复制标题
亚磷酸三苯酯新液相中有关α-玻璃转变的两个冻结过程的存在及其与“簇结构”和“α过程簇内重排”模型的一致性
DOI：
10.1021/jp983926q
复制
发表时间：
1999
影响因子：
3.3
通讯作者：
M. Oguni
中科院分区：
文献类型：
--
作者：
M. Mizukami;K. Kobashi;M. Hanaya;M. Oguni
用粉末X射线衍射法、绝热量热法和介电松弛法对亚磷酸三苯酯进行了研究。高度相关的液体，用LC表示，与Cohen等人的冰期相对应。通过在210K下对以LN表示的普通液体进行热处理来制备，而在215和220K下进一步对所制备的LC相样品进行热处理，得到了不同的LC相状态。在从210K到215K的温度跃变后，发现LC相中存在着先吸热再放热的两个不同的过程。第一个过程表现出在液晶相形成温度附近的可逆弛豫时间与温度的关系，因为产生后一个放热效应的过程不会进一步进行。在210K、215K和220K下形成的LC相样品的玻璃化转变温度分别为209.9、212.6和214.0 K。各样品的脆性参数分别为104、99和94。
Triphenyl phosphite was studied by powder X-ray diffractometry, adiabatic calorimetry, and dielectric relaxation measurements. The highly correlated liquid, denoted by LC, phase corresponding with the glacial phase by Cohen et al. was prepared by annealing the ordinary liquid, denoted by LN, at 210 K, and different states in the LC phase were formed by further annealing the prepared LC-phase sample at 215 and 220 K. After the temperature jump from 210 to 215 K, two different processes first of heat absorption and then heat evolution were found to exist in the LC phase. The first process showed reversible temperature dependence of the relaxation times near the temperature of LC-phase formation as far as the process bringing the latter heat evolution effect did not proceed any further. The glass transition temperatures were found to be 209.9, 212.6, and 214.0 K for the LC-phase samples formed at 210, 215, and 220 K, respectively. The fragility parameters of the respective samples were 104, 99, and 94, compa...