[Viscoelastic behaviour of inlay waxes. (Part 2) Physical and dynamic viscoelastic properties for binary mixtures of waxes (author's transl)].
[Viscoelastic behaviour of inlay waxes. (Part 2) Physical and dynamic viscoelastic properties for binary mixtures of waxes (author's transl)].
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[镶嵌蜡的粘弹性行为。
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
N. Katakura
中科院分区：
文献类型：
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作者：
N. Katakura
用X射线衍射、差热分析、动态粘弹性等方法研究了石蜡中加入巴西棕榈蜡、蜂蜡和达玛蜡的二元混合物。讨论了这些蜡的粘弹行为与其物理性能之间的关系。巴西棕榈蜡添加到石蜡中显著改变了石蜡的粘弹性，即，在较高温度区域（包括石蜡的晶体转变温度区域）中，增加了动态模量G '，并降低了损耗角正切tan δ。粘弹性能变化的可能解释是，由比石蜡更长链分子组成的巴西棕榈蜡晶体的存在增强了界面相互作用。石蜡和蜂蜡二元混合物的粘弹性能随温度的变化规律与石蜡基本相同。这是因为石蜡和蜂蜡可以形成一种均相。在较低温度区，达玛的加入提高了石蜡的弹性，但在较高温度区，对G'和tan δ的变化没有影响。添加达玛的另一个效果是降低二元混合物的热膨胀。
Binary mixtures of waxes added carnauba wax, beeswax or dammar to paraffin 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. Additions of carnauba wax to paraffin changed drastically viscoelastic properties of paraffin, that is, increased the dynamic modulus, G', and decreased the loss tangent, tan delta, in the region of higher temperatures including the crystal transition temperature region of paraffin. The possible explanation for this change of viscoelastic properties is that the presence of crystals of carnauba wax composed of longer chain molecules than that of paraffin rises interfacial interaction. The temperature dependence of viscoelastic properties for binary mixtures of paraffin and beeswax was approximately the same as that of paraffin. This is because paraffin and beeswax may form a sort of homogeneous phases. Additions of dammar to paraffin increased the elasticity of paraffin in the region of lower temperatures, but did not effected to change of G' and tan delta in the region of higher temperatures. Another effect of additions of dammar was to lower the thermal expansion of binary mixtures.