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首页> 外文期刊>Journal of Applied Polymer Science >Polyurethane/Conducting Carbon Black Composites: Structure, Electric Conductivity, Strain Recovery Behavior, and Their Relationships
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Polyurethane/Conducting Carbon Black Composites: Structure, Electric Conductivity, Strain Recovery Behavior, and Their Relationships

机译：聚氨酯/导电炭黑复合材料：结构，电导率，应变恢复行为及其关系

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摘要

The polyurethane composites with conducting carbon black(CB) were prepared by a solution-precipitation process, which was followed by melt compression molding. The polyurethane used has good shape memory effect. The morphology of CB fillers in polyurethane matrix andthe resulting conductivity of the composites were investigated. It has been found that CB fillers exist in the forms of aggregates. The percolation threshold is achieved at the CB concentration of 20 wt %. The presence of CB fillers decreases the degree of crystallinity of polycaprolactone (PCL) soft segments of the polyurethane. However, the composites still have enough soft-segment crystals of polyrethane to fulfil the necessary condition for the shape memory properties. Dynamic mechanical data show that CB is an effective filler for the reinforcement of the polyurethane matrix, but does not deteriorate the stable physical cross-link structure of the polyurethane, which is necessary to store the elastic energy in the service process of the shape memory materials. Addition of CB reinforcement in the polyurethane has influenced the strain recovery properties, especially for those samples with CB concen-trations above the percolation threshold. The response temperature of the shape memory effect T_r has not been affected too much. Strain flxation S_f, which expresses the ability of the speciments to fix their strain, has been improved in the presence of the CB fillers. The final recovery rates R_f and strain recovery speeds V_r of the shape memory measurements, however, have decreased evidently. It is expectedly ascribed to the increased bulk viscosity as well as the impeding effect of the inter-connective structure of CB fillers in the polymer matrix.
机译：通过溶液沉淀法制备了具有导电炭黑（CB）的聚氨酯复合材料，然后进行熔体压缩成型。使用的聚氨酯具有良好的形状记忆效果。研究了聚氨酯基体中CB填料的形貌以及所得复合材料的电导率。已经发现CB填料以聚集体形式存在。在CB浓度为20 wt％时达到渗滤阈值。 CB填料的存在降低了聚氨酯的聚己内酯（PCL）软链段的结晶度。然而，复合材料仍然具有足够的聚氨基甲酸酯软段晶体，以满足形状记忆性能的必要条件。动态力学数据表明，CB是增强聚氨酯基体的有效填料，但不会破坏聚氨酯的稳定物理交联结构，这在形状记忆材料的使用过程中必须存储弹性能。在聚氨酯中添加CB增强材料已经影响了应变恢复性能，特别是对于那些CB浓度高于渗滤阈值的样品。形状记忆效应T_r的响应温度没有受到太大影响。表示样品固定其应变能力的应变固定S_f在存在CB填料的情况下得到了改善。但是，形状记忆测量的最终恢复率R_f和应变恢复速度V_r明显降低。预期归因于增加的本体粘度以及在聚合物基体中CB填料的互连结构的阻碍作用。

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