Katakura N
Shika Rikogaku Zasshi. 1980 Jul;21(55):209-16.
Several raw material waxes used in the inlay waxes, such as paraffins, carnauba wax, beeswax and dammar were investigated by measurements of X-ray diffraction, dilatometry, differential thermal analysis and dynamic viscoelasticity. The relationships between the viscoelastic behaviour and the physical properties of these waxes were discussed. The solid-solid phase transition from orthorhombic to hexagonal occurred in paraffins and the difference of the crystal transition temperature was observed between the kinds of paraffins. The viscoelastic properties and the thermal expansion of paraffins changed considerably in the crystal transition temperature region. Carnauba wax was an orthorhombic material, but such a crystal transition as paraffins did not appear. The dynamic modules of carnauba wax was greater than that of paraffin and decreased slowly to 70 degrees C and the loss tangent was small in this region. It was found, therefore, that carnauba wax had an elastic property in the crystal transition region of paraffin. Beeswax was also an orthorhombic material. The dynamic modulus of this was smallest in these waxes and the loss tangent increased relatively slowly with increases in temperature. Dammar was an amorphous solid. The dynamic modulus and the loss tangent were approximately constant in the low temperature region and changed greatly in the glass transition region. The thermal expansion of dammar was smallest in these waxes.
通过X射线衍射、膨胀测量法、差热分析和动态粘弹性测量等手段，对嵌体蜡中使用的几种原料蜡，如石蜡、巴西棕榈蜡、蜂蜡和达玛树脂进行了研究。讨论了这些蜡的粘弹性行为与物理性质之间的关系。石蜡中发生了从正交晶系到六方晶系的固-固相变，并且观察到不同种类石蜡的晶体转变温度存在差异。在晶体转变温度区域，石蜡的粘弹性性质和热膨胀发生了显著变化。巴西棕榈蜡是一种正交晶系材料，但未出现像石蜡那样的晶体转变。巴西棕榈蜡的动态模量大于石蜡，在70摄氏度时缓慢下降，且该区域内损耗角正切较小。因此发现，巴西棕榈蜡在石蜡的晶体转变区域具有弹性特性。蜂蜡也是一种正交晶系材料。其动态模量在这些蜡中最小，损耗角正切随温度升高相对缓慢增加。达玛树脂是一种非晶态固体。在低温区域，动态模量和损耗角正切大致恒定，在玻璃化转变区域变化很大。达玛树脂的热膨胀在这些蜡中最小。
