Fine Structures and Phase Transitions in Polyorganophosphazene

在两年的时间里，我们在这个国际科学研究计划中研究了以下主题。(1)聚[双（对氟苯氧基）磷腈]和聚[双（对氯苯氧基）磷腈]与多晶型相关的退火效应的结构研究。这些退火效应仅在T（1）转变以上的温度范围内观察到。在这项研究中，我们已经确定了聚[双（对氟苯氧基）磷腈]的晶格常数。(2)各种聚有机磷腈从二维介观态到三维结晶态转变的动力学研究（样品厚度依赖性或成核效应）。(3)聚[双（对甲基苯氧基）磷腈]和聚[双（对甲基苯氧基）磷腈]单晶的制备及其晶格常数的电子衍射测定。(4)用超声波吸收法研究聚磷腈的相变。在170 ℃的T（1）范围内，已经清楚地检测到声速变化和吸收强度变化。这些合作研究的两个主题（2）和（4）将在明年继续进行。在这一合作中，日美之间经历了各种各样的相互理解。我们非常感谢教育部，他们给了我们执行国际研究计划的机会。

We have investigated the following subjects at this International Scientific Research Program in two years.(1) Structural studies on annealing effects of poly[bis(p-fluorophenoxy)phosphazene] and poly[bis(p-chlorophenoxy)phosphazene] associated with polymorphism. These annealing effects are only observed in the temperature range higher than T(1) transition. In this study, we have determined the lattice constants of poly[bis(p-fluorophenoxy)phosphazene]. (2) Kinetic studies on transformations from the 2D meso state to the 3D crystalline state in various kinds of polyorganophosphazene ( sample thickness dependence or nucleation effects ). (3) Preparation of single crystals of poly[bis(p-methylphenoxy)phosphazene] and poly[bis(p-methylphenoxy)phosphazene and determination of their lattice constants by electron diffraction techniques. (4) Examinations of phase transitions in polyphosphazeness by an ultra sonic absorption method. Sonic velocity changes and absorption intensity changes have clearly been detected at 170 C in the T(1) range.Two subjects of these cooperative studies, (2) and (4), will be continued further in the next year. In this cooperation, wide varieties of mutual understandings between Japan and the United States have been experienced. We appreciate very much the Ministry of Education, who gave the chance to execute the International Research Program.