Calorimetric Study on Structural Relaxation of Molecular Ground

分子基础结构弛豫的量热研究

基本信息

批准号：
06804032
负责人：
YAMAMURO Osamu
金额：
$ 1.34万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

A top-loating adiabatic calorimeter has been constructed for the first time. From the test experiments of an empty cell and benzoic acid (standard substance), the precision and accuracy of heat capacity were confirmed to be better that 0.1 % in the temperature region between 12 and 380 K.tri-OMICRON-methyl-beta-cyclodextrin (TMCD), sucrose (SUC), salicin (SAL), phenolphthalein (PP), 1,3,5-tri-alpha-naphthylbenzene (TNB), p-quaterphenyl (p-QP), p-terphenyl (p-TP) and 1,3,5-triphenylbenzene (TPB) were ground with a vibration mill and their abilities of mechanical milling amorphization were investigated by X-ray powder diffraction and differential thermal analysis. It was found that the ability of mechanical milling amorphization is strongly related to the glass forming ability.The heat capacities of the ground amorphous solids (GAS) and liquid-quenched glasses (LQG) of TMCD and TNB were measured with an adiabatic calorimeter in the temperature range between 5 and 380 K.It was found that GAS exhibits larger configurational enthalpy than LQG for both samples, suggesting that the molecular GAS has a structure with large orientational disorder, local strain, and defects.The grinding-time and grinding-temperature dependences of the enthalpy relaxation were investigated using TMCD.It was found that the amorphization process and enthalpy obtaining process are associated with not only the free-energy difference between the liquid and the crystal and the structural relaxation time but also the mechanical properties (e.g.plasticity) of the crystal and the amorphized solid.

首次构建了顶层绝热量热仪。从一个空细胞和苯甲酸（标准物质）的测试实验中，确认热容量的精确性和准确性更好，在12至380 K.tri-Omicron-methyl-methyl-beta-cyclodextrin（TMCD），soccrose（succlose（suc），salicin（salicin（salicin），salicin（salicin（salicin）），酚类素（lotolphthaLe）（plaenolphthale）（plphlphthale）（plphthale）（plphlthale）（pp），pp），salicin（salicin（pp） 1,3,5-α-北苯基苯（TNB），p- Quaterphenyl（P-QP），P-二苯基（P-TP）和1,3,5-三苯基苯苯（TPB）均通过振动磨机及其机械磨床的动力进行了X-RAIDARIDACTARAIGAL SYTRACTAIL XERAIGAL XERAMET X-RAIMARAIDE X-RAIDARE X-RAIDARE diffaction and offibility os X-RAINARE diffaction and Inlocial Fignation Mill。发现机械铣削非晶化的能力与玻璃形成能力密切相关。地面无定形固体（气体）和TMCD和TNB的液体淬火玻璃（LQG）的热容量用5和380 k的温度范围内的较大的liq。分子气具有具有较大的定向障碍，局部应变和缺陷的结构。使用TMCD研究了焓弛豫的磨碎时间和磨削温度的依赖性。它发现非形态化过程和焓获得过程不仅与液体和结构宽松的时间之间的自由差异相关，而且还与晶体和结构的自由差异相关联（而且是机制的机制）（e。非晶的固体。